Abstract: A method for manufacturing a titanium alloy sheet, which comprises the steps of: covering at least one titanium alloy slab with carbon steel plates, welding together the carbon steel plates by means of a high-energy-density welding under a vacuum atmosphere to prepare a carbon steel envelope, thereby preparing an assembled slab, containing the titanium alloy slab therein, with an interior thereof kept at a degree of vacuum of up to 10.sup.-2 ; applying, prior to preparation of the assembled slab, a release agent comprising a solid content having a particle size of up to 325 mesh, onto the surfaces of the titanium alloy slab or onto the inner surfaces of the carbon steel envelope facing thereto, adjusting the total applying quantity of the release agent so as to satisfy the following formula: 5,000.ltoreq.X.multidot.Y/(1-.sqroot. Z).ltoreq.25,000, where X: weight percentage (wt. %) of the solid content in the release agent, Y: total applying quantity (ml/m.sup.

Abstract: Process for improving the mechanical properties and ultrasonic inspection efficiency of alpha-2 titanium aluminide forged products, parts or components and for preserving or retaining these improved properties at use temperatures up to about 1200.degree. F. The process involves heating a billet of the alloy below its beta transus temperature, forging the heated billet within a true strain range of about 1.2 and 1.4 and within a strain rate of about 0.1 and 0.15 per second to produce >90% refinement of prior .beta. grains to a typical size less than about 0.2 mm, preferably about 0.02 mm, and cooling the forged billet to room temperature.

Abstract: TiAl-besed intermetallic compound alloys contain chromium and consist essentially of a dual-phase microstructure of .gamma. and .beta. phases, with the .beta. phase precipitating at .gamma. grain boundaries. The .beta. phase precipitating at .gamma. grain boundaries is 2% to 25% by volume fraction. A process for preparing TiAl-based intermetallic compound alloys comprises the steps of preparing a molten TiAl-based intermetallic compound alloy of a desired composition, solidifying the molten alloy, homogenizing the solidified alloy by heat treatment, and thermomechanically working the homogenized alloy.

Abstract: Provided are a titanium target material which can easily form a film in a narrow and deep contact hole and reduce the generation of PARTICLES. The present invention relates to a titanium target for sputtering, wherein X-ray diffraction intensity ratios on a sputtering plane are (0002)/(1011).gtoreq.0.8, (0002)/(1010).gtoreq.6; a recrystallized structure which has an average crystal grain size of 20 .mu.m or less and in which the proportion of crystal grains in which an acicular structure is present is 20% or less in terms of an area rate is formed.

Abstract: An alpha-beta titanium alloy preform is processed in the beta phase field, by heat treating or beta forging. The processed preform is thereafter heated into the alpha-beta phase field, and a preselected portion is forged, leaving a nonselected portion that is not forged in the alpha-beta phase field. The resulting article has a beta-processed structure in the nonselected portion, and a beta-processed plus alpha-beta forged structure in the preselected portion. In one application, the preform has the shape of a disk useful in the manufacture of an aircraft gas turbine engine. Depending upon specific requirements, either the center or the rim of the disk may be the selected portion.

Abstract: A cast and hot isostatically pressed gamma titanium aluminide turbine blade (26) has an aerofoil portion (38) including a concave pressure surface (44) and a convex suction surface (46). The concave pressure surface (44) has surface irregularities (48), produced by the action of the hot isostatic pressing process on voids (56) located within the cast turbine blade (26), located in that region (50) of the concave pressure surface (44) where in operation aerodynamic separation (G) occurs to minimise the aerodynamic effects of the surface irregularities (48) upon the operation of the turbine blade (26). The remaining portion of the concave pressure surface (44) and the whole of the convex suction surface (46) are substantially free of surface irregularities (48).

Abstract: A process for manufacturing an aneurysm clip (10) having a coil spring (22), a first arm (26) ending in a first clamping jaw, and a second arm (34) ending in a second clamping jaw (40). The method includes: (a) providing a cylindrical starting rod (1) of titanium or titanium alloy; (b) cold drawing the rod to reduce its diameter and increase its strength; (c) cutting the rod to form a single resilient member (12); (d) winding the member about a mandrel to form the coil spring while incorporating the deflection of the arms into the clamping force of the clip; (e) shaping the member into two end sections (16) forming the clamping jaws and two connecting sections (18) forming connecting elements for the jaws; (f) coining the two end sections of the member a temperature between 900 and 1000 degrees F.; and (g) bending the clamping jaws into a position assuring that the clamping jaws are parallel when clamped onto tissue (70).

Abstract: A method of producing a cold-rolled strip from a stainless, ferretic or austenitic high-grade steel or a titanium alloy, wherein the strip which has been wound into a coil and has been manufactured by a hot-rolling or casting process is subjected in one pass to the steps of unwinding the coil, mechanically descaling the strip if required, subsequently chemically and/or electrochemically first or black pickling of the strip, then cold-rolling the strip to finished dimensions, degreasing the strip as required, annealing the strip, finish-pickling the strip and, if necessary, passivating, dressing and stretcher-leveling the strip. The pickling step is carried out in a pickling solution which contains hydrochloric acid, sulfuric acid and/or nitric acid.

Abstract: Gamma titanium aluminide alloys having the composition Ti-(45.5-47.5)Al-(0-3.0)X-(1-5)Y-(0.05-1.0)W, where X is Cr, Mn or any combination thereof, and Y is Nb, Ta or any combination thereof (at %), are treated to provide specific microstructures. To obtain duplex microstructures, the annealing temperature (T.sub.a) range is the eutectoid temperature (T.sub.e)+100.degree. C. to the alpha transus temperature (T.sub..alpha.)-30.degree. C.; to obtain nearly lamellar microstructures, the annealing temperature range is T.sub..alpha. -20.degree. C. to T.sub..alpha. -1.degree. C.; to obtain fully lamellar microstructures, the annealing temperature range is T.sub..alpha. to T.sub..alpha. +50.degree. C. The times required for producing these microstructures range from 0.25 to 15 hours, depending on the desired microstructure, alloy composition, annealing temperature selected, material section size and grain size desired.

Abstract: A method for manufacturing an .alpha.+.beta. type titanium alloy plate having a small anisotropy in strength by subjecting an .alpha.+.beta. type titanium alloy slab to a hot-rolling, which comprises: the hot-rolling comprising a cross-rolling which comprises a hot-rolling in a L-direction and a hot-rolling in a C-direction, the L-direction being a final rolling direction in the hot-rolling and the C-direction being a direction at right angles to the L-direction; and controlling the cross-rolling so that a value of an overall cross ratio of rolling (CR.sub.total) determined by means of the following formula is kept within a range of from 0.5 to 2.0:CR.sub.total =(CR.sub.1).sup.0.6 .times.(CR.sub.2).sup.0.8 .times.(CR.sub.3).sup.1.0where, CR.sub.1 is a cross ratio of rolling within a rolling temperature region of from under T.beta. .degree.C. to T.beta. .degree.C.-50.degree. C., CR.sub.2 is a cross ratio of rolling within a rolling temperature region of from under T.beta. .degree.C.-50.degree. C. to T.beta. .

Abstract: A method for making an .alpha.+.beta. titanium alloy comprising: preparing an .alpha.+.beta. titanium alloy, hot-working the titanium alloy in an .alpha.+.beta. phase region, heating and then heat treating the hot-worked titanium alloy to a temperature from the .beta.-transus minus 55.degree. C. to the .beta.-transus minus 10.degree. C., air cooling the heat treated titanium alloy, heating and then heat treating the air cooled titanium alloy to a temperature from the .beta.-transus minus 250.degree. C. to the .beta.-transus minus 120.degree. C., and air cooling the heat treated titanium alloy.

Abstract: Object of the present invention is to obtain a Nb.sub.3 Al group superconductor having a high critical current density under a whole range of magnetic field from low to high such as 20 T level, manufacturing methods thereof, a Nb.sub.3 Al group superconducting precursory composition, and a magnet for high magnetic field. In a process for manufacturing Nb.sub.3 Al phase by a diffusion reaction of Nb.sub.2 Al phase and Nb phase, a part of the Nb.sub.2 Al phase is remained and dispersed in the Nb.sub.3 Al phase homogeneously as for magnetic flux pinning centers for a high magnetic field. As for a method for dispersing the Nb.sub.2 Al phase homogeneously, a Nb.sub.3 Al group superconducting precursory composition obtained by dispersing Nb particles and Nb.sub.2 Al ultrafine particles by a mechanical alloying method is used, and further, by a conventional method for generating Nb.sub.3 Al phase by a diffusion reaction of Nb and an aluminum alloy, the object of the present invention can be achieved.

Abstract: An as-cast gamma titanium-aluminide alloy, typically having a composition of from about 45.0 to about 48.5 atomic percent aluminum, is pre-HIP heat treated at a temperature of from about 1900.degree. F. to about 2100.degree. F. for a time of from about 50 to about 5 hours. The gamma titanium-aluminide alloy is thereafter hot isostatically pressed at a temperature of about 2200.degree. F. Hot isostatic pressing is preferably followed by a further heat treatment at a temperature of about 1850.degree.-2200.degree. F.

Abstract: Gamma titanium aluminide alloys having the composition Ti--(45.5-47.5)Al--(0-3.0)X--(1-5)Y--(0.05-1.0)W, where X is Cr, Mn or any combination thereof, and Y is Nb, Ta or any combination thereof (at %), are treated to provide specific microstructures. To obtain duplex microstructures, the annealing temperature (T.sub.a) range is the eutectoid temperature (T.sub.e)+100.degree. C. to the alpha transus temperature (T.sub..alpha.)-30.degree. C.; to obtain nearly lamellar microstructures, the annealing temperature range is T.sub..alpha. -20.degree. C. to T.sub..alpha. -1.degree. C.; to obtain fully lamellar microstructures, the annealing temperature range is T.sub..alpha. to T.sub..alpha. +50.degree. C. The times required for producing these microstructures range from 0.25 to 15 hours, depending on the desired microstructure, alloy composition, annealing temperature selected, material section size and grain size desired.

Abstract: The present invention comprises a plurality of single phase gamma TiAl alloys modified by Ta. These alloys comprise Ti.sub.(45-46) Al.sub.(50-51) Ta.sub.4 in atomic percent, and exhibit significant room temperature ductility, in the range of 1.3-2.1% tensile elongation. The alloys may be made by the use of cast and forging techniques.

Abstract: A titanium matrix composite having eutectically formed titanium alloy reinforcement containing at least two of the elements of silicon, aluminum, zirconium, manganese, chromium, molybdenum, carbon, iron, boron, cobalt, nickel, germanium and copper.

Abstract: A method for heat treatment of nonferrous metals and alloys is described which comprises the steps of providing a billet of material comprising nonferrous metal or alloy; rapidly heating the billet to a temperature higher than the transus or solvus temperature of the material whereby a microstructure of uniform single phase grains is formed in a surface layer of preselected depth or other selected region in the billet with the starting microstructure of the material central of the billet; and cooling the billet to room temperature to preserve in the billet surface the high temperature single phase microstructure or a transformation product thereof.

Abstract: A method for thermomechanically processing gamma titanium aluminide alloy wrought products comprises the following steps: a) a near gamma titanium aluminide alloy ingot is cast; b) the ingot is hot isostatically pressed (HIP'ed) to seal off casting defects; c) the HIP'ed ingot is prepared into suitable forging preforms with or without intermediate homogenization heat treatment; d) the forging preforms are isothermally forged into suitable end product preforms at temperatures sufficiently close to the phase line between the alpha+gamma and alpha-two+gamma phase fields so as to break down the ingot microstructure and to yield a largely equiaxed gamma microstructure; and e) the end product preforms are processed into the desired wrought end products through a controlled rolling process or a closed-die forging operation.

Abstract: Gamma titanium aluminide alloy articles having improved properties are produced by the following methods:The first of these methods comprises the steps of: (a) heat treating an alloy billet or preform at a temperature in the approximate range of T.sub..alpha. to T.sub..alpha. +100.degree. C. for about 0.5 to 8 hours, (b) shaping the billet at a temperature between T.sub..alpha. -30.degree. C. and T.sub..alpha. to produce a shaped article, and (c) aging the thus-shaped article at a temperature between about 750.degree. and 1050.degree. C. for about 2 to 24 hours.The second method comprises (a) rapidly preheating an alloy preform to a temperature in the approximate range of T.sub..alpha. to T.sub..alpha. +100.degree. C., (b) shaping the billet at a temperature between T.sub..alpha. and T.sub..alpha. +100.degree. C. to produce a shaped article, and (c) aging the thus-shaped article at a temperature between about 750.degree. and 1050.degree. C. for about 2 to 24 hours.

Abstract: A thermal mechanical processing sequence for application to alpha-two type titanium is discussed. A typical alloy composition is 14% aluminum, 23% niobium, 2% vanadium, and balance titanium. Tensile ductilities in excess of 10% and up to about 40% are provided in this material by a processing sequence which includes multiple working steps below the beta transus with intervening thermal anneals also at temperatures below the beta transus. Typical rolling start temperatures would be on the order 954.degree. C. (1750.degree. F.). Typical annealing temperatures range from 732.degree. C. (1350.degree. F.) to 954.degree. C. (1750.degree. F.).

Abstract: A method for inducing superplasticity in a composite including a non-transforming phase and a transforming phase by cycling the composite material through a phase transformation of the transforming phase while applying an external stress to the composite material is provided as is a method for inducing superplasticity in a titanium/titanium carbide composite. Also provided is a method for forming a part from a composite material including a transforming phase and a non-transforming phase by cycling the composite through a phase transformation of the transforming phase and shaping the composite material by applying an external stress to the composite material while the transforming phase is undergoing a phase transformation to form a finished article.

Abstract: A method of making a titanium base alloy comprising the steps of heating a titanium base alloy to a temperature ranging from .beta.-transus minus 250.degree. C. to .beta.-transus; and hot working the heated alloy with a reduction ratio of at least 50%. The titanium base alloy consists essentially of about 3.42 to 5 wt. % Al, 2.1 to 3.7 wt. % V, 0.85 to 2.37 wt. % Mo, at least 0.01 wt. % O, at least one element selected from the group consisting of Fe, Co, Cr, and the balance being titanium. The invention also includes superplastic forming of said alloys. The titanium alloy satisfies the following equations:0.85 wt. %.ltoreq.X wt. %.ltoreq.3.15 wt. %,7 wt. %.ltoreq.Y wt. %.ltoreq.13 wt. %,X wt. %=Fe wt. %+Co wt. %+0.9 Cr wt. %Y wt. %=2.times.Fe wt. %+2.times.Co wt. %+1.8.times.Cr wt. %+1.5.times.V wt. %+Mo wt. %.

Abstract: The fracture resistance of titanium alloy matrix composites is increased by one of two methods. One method comprises the steps of consolidating a titanium alloy-fiber preform under suitable conditions to provide a metal matrix composite and thermally treating the thus-prepared composite at a temperature above the beta-transus temperature of the alloy for a brief time. In the second method, a composite having increased fracture resistance is produced by consolidating an alloy-fiber preform at a temperature above the normal consolidation temperature for a time less than the normal consolidation time.

Abstract: An alpha/beta titanium alloy having improved fatigue crack growth resistance can be prepared through a thermomechanical process using a three-step thermal treatment. The first step includes a heat up and hold at a temperature above the beta transition temperature, while the second step is a stabilization treatment which includes a heat up and hold below the beta transition temperature, in the alpha/beta range. The third thermal treatment is an aging treatment. The invention is particularly useful in preparing forged parts for aircraft.

Abstract: A non-burning Ti-V-Cr alloy which is heat treated to decrease its susceptibility to embrittlement in gas turbine engine compressor applications. The invention heat treat cycle consists of an isothermal holding period below the alpha solvus temperature, a slow ramp down to a lower temperature, a second holding period at a lower temperature, a third ramp down to an even lower temperature, and a final holding period at the third temperature. Other suitable heat treat cycles within the concept of the invention include a single holding period below the alpha solvus temperature double holding periods below the alpha solvus temperature with a ramp from a higher to a lower temperature and a continuous ramp below the alpha solvus temperature with no holding period.

Abstract: The present invention provides an Nb-Ti alloy type superconducting wire having a superconducting filament including a member made of Nb-Ti alloy and a pinning member made of Nb or Nb alloy having no superconducting properties under operating magnetic field, the Nb-Ti based alloy containing Ti in a content of 48 to 65% by weight and the superconducting filament containing Nb or an Nb alloy (A) in a ratio of 20 to 35% by volume. The present invention further provides an Nb-Ti alloy type superconducting wire having a superconducting filament including a member made of Nb-Ti alloy and a pinning member made of Ti or Ti alloy having a critical temperature lower than that of the Nb-Ti alloy and/or having no superconducting properties; the Nb-Ti based alloy containing Ti in a content of 25 to 45% by weight and the superconducting filament containing Ti or a Ti alloy in a ratio of 20 to 35% by volume.

Abstract: Ti powders and Al powders are combined to prepare a mixture of 40.about.55 at % of Al and the balance of Ti. After CIP and degassing, plastic working by hot extrusion is applied to form a shaped mixture of Ti and Al. The shaped mixture is then processed by HIP to synthesize titanium aluminide while diffusing Al into the Ti structure to form an Al.sub.2 O.sub.3 phase occurring from both the reaction between Al and oxygen contained in the Ti structure and the oxides on the Al surface, and to disperse the Al.sub.2 O.sub.3 to form the Al.sub.2 O.sub.3 protective film. With the reaction between Al and oxygen contained in the Ti structure and with the "Pegging" effect, both the Al.sub.2 O.sub.3 a phase formed at the grain boundaries of crystals or in the crystal grains of titanium aluminide and the Al.sub.2 O.sub.3 phase existing on the surface of raw material Al powder peg the surface Al.sub.2 O.sub.3 film to the surface of the titanium aluminide body.

Abstract: Creep resistant titanium aluminide alloy article consisting essentially of, in atomic %, about 45 to about 48 Al, about 1.0 to about 3.0 Nb, about 0.5 to about 1.5 Mn, about 0.25 to about 0.75 Mo, about 0.25 to about 0.75 W, about 0.15 to about 0.3 Si and the balance titanium. The article has a heat treated microstructure including gamma phase, alpha-two phase and at least one additional particulate phase including, one or more or W, Mo, and Si dispersed as distinct regions in the microstructure.

Abstract: An alpha-beta titanium-base alloy having a good combination of strength and ductility with a relatively low cost composition. The composition, in percent by weight, is 5.5 to 6.5 aluminum, 1.5 to 2.2 iron, 0.07 to 0.13 silicon and balance titanium. The alloy may have oxygen restricted in an amount up to 0.25%. The alloy may be hot-worked solely at a temperature above the beta transus temperature of the alloy to result in low-cost processing with improved product yields. The hot-working may include forging, which may be conducted at a temperature of 25.degree. to 450.degree. F. above the beta transus temperature of the alloy. The hot-working may also include hot-rolling, which also may be conducted at a temperature of 25.degree. to 450.degree. F. above the beta transus temperature of the alloy.

Abstract: The present invention relates to a low cost process for providing equivalent or superior ballistic resistance performance compared to standard Ti-6Al-4V alloys. The present inventions process involves increasing the oxygen content of Ti-6Al-4V beyond the conventional limit of 0.20% maximum reported for prior art compounds and subsequently thereafter heating the oxygen rich titanium alloy at temperatures within the beta phase field for further processing.Additionally, the present invention provides a novel Ti-6Al-4V alloy composition which exhibits improved tensile and yield strength properties. Titanium compositions of the present invention exhibit improved ballistic properties compared to titanium compositions previously disclosed in the art. The novel Ti-6Al-4V composition of the present invention is obtained by modifying the alloy composition limits to 5.5 to 6.75% Al, 3.5 to 4.5% V, 0.20 to 0.30% O.sub.2, <0.50% Fe and 0.

Abstract: A method of manufacturing corrosion resistant tubing from seam welded stock of a titanium or titanium alloy metallic material having a hexagonal close-packed crystal structure. The method includes cold pilgering a seam welded tube hollow having a weld area along the seam in a single pass to a final sized tube. The cold pilgering effects a reduction in cross sectional area of the tube hollow of at least 50% and a reduction of wall thickness of at least 50% thereby orienting the crystals in a radial direction. The method also includes annealing the final sized tubing at a temperature and for a time sufficient to effect complete recrystallization and reform grains in the weld area into smaller, homogeneous radially oriented grains. After the recrystallization annealing step, the tubing exhibits enhanced corrosion resistance which is similar to seamless tubing.

Abstract: A method for hot forging coarse grain materials to enhance hot workability and to refine microstructure is described which comprises the steps of imposing minimum initial deformation at low strain rate to effect initial dynamic recrystallization and grain refinement without fracture, and thereafter increasing the deformation rate to recrystallize the material and further refine grain structure. Depending on the deformation required to achieve full recrystallization at a given rate, deformation rate can be increased a number of times to further refine grain structure.

Abstract: A TiAl composition is prepared to have high strength, high oxidation resistance and to have acceptable ductility by altering the atomic ratio of the titanium and aluminum to have what has been found to be a highly desirable effective aluminum concentration and by addition of chromium and tantalum and boron ingredients according to the approximate formula Ti-Al.sub.46-50 Cr.sub.2 Ta.sub.2-4 B.sub.0.05-0.2. Homogenization of the composition above the alpha transus temperature is used in combination with the boron doping to achieve higher ductility without sacrifice of strength.

Abstract: A titanium alloy part having a structure comprising ex-beta acicular grains and with equi-axial alpha phases gathered in a plurality of rows at boundaries of the grains. The alloy comprises, by weight, 2 to 5% Mo, 3.5 to 6.5% Al, 1.5 to 2.5% Sn, 1.5 to 4.8% Zr, Fe.ltoreq.1.5%, 4 to 12% Mo+V+Cr, and the balance, titanium and impurities.

Abstract: The present invention relates to a process in which a metal or metal alloy is thermal spray coated onto a base alloy material prior to hot working. More specifically, the invention relates to the use of plasma coating of titanium over a titanium alloy plate for improved hot workability. This combination allows the crack-sensitive base alloy to be rolled with a minimum of surface and edge cracks. In addition, by using a plasma sprayed titanium coating there is a reduction in the roll force required to reduce the material during the hot working process.

Abstract: A TiAl alloy base melt including at least one of Cr, C, Ga, Mo, Mn, Nb, Ni Si, Ta, V and W and at least about 0.5 volume % boride dispersoids is investment cast to form a crack-free, net or near-net shape article having a gamma TiAl intermetallic-containing matrix with a grain size of about 10 to about 250 microns as a result of the presence of the boride dispersoids in the melt. As hot isostatically pressed and heat treated to provide an equiaxed grain structure, the article exhibits improved strength.

Abstract: Tri-titanium aluminide alloys are preferably deformed and heat treated below the beta transus temperature of the alloys to produce an improved combination of mechanical properties, specifically elevated temperature yield strength and creep resistance, and room temperature ductility and toughness. A preferred composition consists essentially of, in atomic percent, 24.5% aluminum, 12.5% niobium, 1.5% molybdenum, balance titanium.

Abstract: A titanium alloy billet having improved response to ultrasonic inspection is described. The billet is given a thermomechanical treatment above the beta transus of the alloy immediately prior to ultrasonic inspection. The treatment may include beta annealing or mechanical deformation above the beta transus. The invention is particularly effective for beta-stabilized alpha-beta and beta titanium alloys.

Abstract: A method of producing a part having high strength and improved ductility from a titanium alloy having a composition, in percent by weight, or Mo equivalent 5 to 13 and Al equivalent 3 to 8, the balance being titanium and impurities, comprising the steps of hot working an ingot of the alloy including a roughing down under heat and preparation of a blank under heat, preheating to a temperature situated above the real beta transus of the hot worked alloy, and then final working of at least a part of this blank, after which the blank obtained is subjected to a solution heat treatment and then aged. The hot worked blank is cooled from the preheating temperature to a temperature for the beginning of final working which, under the conditions of the cooling of the blank, is at least 50.degree. C. below the real beta tansus and at least 10.degree. C. above the temperature of appearance of the alpha phase, so that the final working is sufficient to end within the alpha nucleation range.

Abstract: A method for providing improved ductility in a gamma titanium aluminide is taught. The method involves adding inclusions of boron to the titanium aluminide containing chromium, carbon, and niobium and thermomechanically working the casting. Boron additions are made in concentrations between 0.5 and 2 atomic percent. Fine grain equiaxed microstructure is found from solidified melt. Property improvements are achieved by the thermomechanical processing.

Abstract: A method and apparatus for applying heat sufficient to permit plastic deformation of intermetallic material. The heat is applied to a fractional region of a workpiece, and then manipulations capable of causing the workpiece to deform are applied using conventional sheet metal forming equipment. The invention utilizes elevated forming temperatures to heat the fractional region of the intermetallic workpiece so that the fractional region has sufficient ductility to permit a plastic deformation required for the forming operation. The apparatus is a sheet metal-working machine which has been modified to provide the localized heating required to carry out the process of the present invention.

Abstract: The present invention provides a Ti--Al intermetallic compound sheet of a thickness in the range of 0.25 to 2.5 mm formed of a Ti--Al intermetallic compound of 40 to 53 atomic percent of Ti, 0.1 to 3 atomic percent of at least one of material selected from the group consisting of Cr, Mn, V and Fe, and the balance of Al, and a Ti--Al intermetallic compound sheet producing method comprising the steps of pouring a molten Ti--Al intermetallic compound of the foregoing composition into the mold of a twin drum continuous casting machine, casting and rapidly solidifying the molten Ti--Al intermetallic compound to produce a thin cast plate of a thickness in the range of 0.25 to 2.5 mm and, when necessary, subjecting the thin cast plate to annealing and HIP treating. The Ti--Al intermetallic compound sheet has excellent mechanical and surface properties.

Abstract: A titanium alloy is prepared containing 2 to 4% by weight of aluminum, 1.5 to 2.5% by weight of vanadium, 0.20 to 0.45% by weight of a rare earth element (not essential). 0.05 to 0.11% by weight of sulfur (not essential), and titanium substantially for the remainder, the ratio of the rear earth element content to the sulfur content ranging from 3.8 to 4.2. This titanium alloy is rough-formed and hot-forged at a temperature in a .beta. region, and the resulting titanium alloy ingot is processed directly into a titanium alloy component having a desired shape. The titanium alloy component thus manufactured has a satisfactory fatigue strength and is also excellent in machinability, and can be used for connecting rods, valves, retainers, etc. to be incorporated in the engine of an automobile.

Abstract: A method to increase the fracture resistance of titanium alloy matrix composites which comprises thermally treating a composite at a temperature about 5 to 10% above the beta-transus temperature of the alloy for about 4 to 60 minutes.

Abstract: A TiAl composition is prepared to have high strength, high oxidation resistance and to have acceptable ductility by altering the atomic ratio of the titanium and aluminum to have what has been found to be a highly desirable effective aluminum concentration and by addition of chromium, boron, and tantalum according to the approximate formulaTi-Al.sub.46-48 Cr.sub.1-3 Ta.sub.2-4 B.sub.0.1-0.3.The alloy is cast to form a body and the body is HIPped to impart a desirable combination of properties thereto.

Abstract: Leaders are attached to opposite ends of a titanium foil or thin strip element and are partially coiled on respective reels spaced at opposite sides of a cluster rolling mill to transfer the titanium element back and forth between the reels to move the element between pressure rolls of the mill a plurality of times and under forward and back tension in air at room temperature to initially reduce the element thickness enough to permit the element to be coiled on the reels and then to partially coil the element on the reels to further reduce element thickness. Iron aluminide material is interleaved with a loose coil of the element and the element is heated in a protective atmosphere to stress relieve and partially recrystallize the element material between the reductions in thickness.

Abstract: A method of manufacturing corrosion resistant tubing from seam welded stock of a titanium or titanium alloy metallic material having a hexagonal close-packed crystal structure. The method includes cold pilgering a seam welded tube hollow having a weld area along the seam in a single pass to a final sized tube. The cold pilgering effects a reduction in cross sectional area of the tube hollow of at least 50% and a reduction of wall thickness of at least 50% thereby orienting the crystals in a radial direction. The method also includes annealing the final sized tubing at a temperature and for a time sufficient to effect complete recrystallization and reform grains in the weld area into smaller, homogeneous radially oriented grains. After the recrystallization annealing step, the tubing exhibits enhanced corrosion resistance which is similar to seamless tubing.

Abstract: A process for working .beta. titanium alloy comprises the steps of first elongating the alloy at a temperature not higher than a .beta. transus temperature and at a working ration of 30% or more. Next, conducting a subsequent aging treatment. Then, elongating the alloy at a temperature not higher than the aging treatment temperature and at a working ratio of 70% or more when combined with that in the first step for elongating. Then a recrystallization treatment is carried out at a treating temperature not higher than the .beta. transus temperature or isothermal working is carried out within a temperature range of the .beta. transus temperature minus 200.degree. C. to the .beta. transus.

Abstract: A sheet of Ti 6-2-2-2-2 alloy having a starting thickness of between approximately 0.040 inches and 0.187 inches is thermomechanically treated at a temperature of between approximately 1500 degrees F. and 1750 degrees F. at a mechanical strain rate in the range of between approximately 1.times.10.sup.-4 and 1.times.10.sup.-2 inch per inch per second to produce a formed part having a tensile strength which is approximately 33% greater than untreated rolled Ti 6-2-2-2-2 alloy sheet or plate.

Abstract: A heat treatment method for producing moderate .alpha. grain size (50-250 .mu.m) fully lamellar, microstructures in thin cross section near-.gamma. titanium aluminide alloy products is described, wherein a wrought, fine y grain starting microstructure is heated at a temperature high in the two-phase .alpha.+.gamma. phase field and 30-60.degree. C. below the .alpha. transus temperature to produce a structure of small equiaxed .alpha. grains (about 25 .mu.m dim) and fine .gamma. phase grains, which is then briefly heated to a temperature in the single-phase .alpha. field in order to complete dissolution of remnant .gamma. grains and to minimize growth of .alpha. grains. The material is then cooled to transform the microstructure to fully lamellar .alpha..sub.2 +.gamma..