Abstract: A method for providing improved ductility in a castable gamma titanium aluminide is taught. The method involves adding inclusions of boron to the titanium aluminide containing higher concentrations of 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 for providing improved castability in a gamma titanium aluminide is taught. The method involves adding inclusions of boron to the titanium aluminide containing chromium and niobium. 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 also achieved.

Abstract: The present invention relates to the formation of whisker reinforced metal matrix composites in which complex boride or carbide whiskers having an aspect ratio of greater than 10:1 are distributed throughout a metal, metal alloy, or intermetallic matrix. Exemplary complex boride whiskers include TiNbB, TiTaB, TiVB, NbHfB, and TiNbMoB. Exemplary complex carbide whiskers include TiNbC, TiVC, TiZrC, TiHfC, and TiTaC. A method for the in-situ formation of complex boride and complex carbide whiskers within metallic matrices is disclosed which involves reacting a mixture of individual complex ceramic-forming constituents in the presence of a metal to precipitate the desired complex ceramic whiskers in a metal matrix.

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 by addition of chromium and silicon according to the approximate formula Ti.sub.48 Al.sub.48 Cr.sub.2 Si.sub.2.

Abstract: A novel titanium base alloy having a micrograph with alpha plates oriented in three directions with respect to their parent beta grains, but with alpha plates so short that no basketweave pattern is evident. The alloy contains from 0.02 to 2.0 atomic percent boron; 6 to 30 atomic percent aluminum; 0 to 4 atomic percent tin; 0 to 4 atomic percent gallium; and may contain 0 to 6 atomic percent zirconium of hafnium or a mixture of the two; 0 to 12 atomic percent of at least one metal selected from the group consisting of vanadium, columbium, tantalum, chromium, molybdenum, rhenium, tungsten, ruthenium, and the platinum group metals; and from 0 to 2 atomic percent of at least one element selected from the group consisting of yttrium, carbon and the rare earth metals.

Abstract: An improved titanium aluminide alloy contains from about 18 to 30 atomic percent aluminum, about 34 to 18 atomic percent niobium, with the balance titanium. In alloys of this invention a substatial portion of the microstructure, comprising at least about 50% of the volume fraction, is an orthorhombic phase.

Abstract: An amorphous aluminum-refractory metal alloy with special characteristics such as high corrosion resistance, high wear resistance and considerable toughness, consisting of Al and at least one element selected from refractory metals of Ta, Nb, Mo and W, a portion of the set forth refractory metals being allowed to be substituted with at least one element selected from Ti and Zr.

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 by addition of chromium and tantalum according to the approximate formula Ti.sub.50-44 Al.sub.46-50 Cr.sub.2 Ta.sub.2-4.

Abstract: A continuous thin sheet of a TiAl intermetallic compound consisting of from 35 to 44 wt % Al and the balance Ti and unavoidable impurities, having a thickness of from 0.2 to 3 mm, and having a solidified, as-cast structure comprising columnar crystals extending from both surfaces of the sheet toward the center of the sheet thickness, and a process for producing the same by using a twin-roll type continuous casting procedure.

Abstract: An alloy is provided for use at high temperature. The alloy is a niobium-titanium base alloy and has the following approximate composition.______________________________________ Concentration in atomic percent Ingredient From About To About ______________________________________ Nb balance essentially Ti 31 48 Al 8 21.

Abstract: A heat-resistant TiAl alloy having excellent room-temperature fracture toughness, high-temperature oxidation resistance and high-temperature strength is disclosed. Said alloy consists essentially of from 29 to 35 wt. % aluminum, from 0.5 to 20 wt. % nobium, and at least one element selected from the group consisting of from 0.1 to 1.8 wt. % silicon, and from 0.3 to 5.5 wt. % zirconium, the balance being titanium and incidental impurities. Preferably impurities are limited to 0.6 wt.-% oxygen, 0.1 wt.-% nitrogen and 0.5 wt.-% hydrogen.

Abstract: A titanium-base alloy characterized by a combination of good oxidation resistance at temperatures of at least 1500.degree. F. and good cold rollability. The alloy consists essentially of, in weight percent, molybdenum 14 to 20, niobium 1.5 to 5.5, silicon 0.15 to 0.55, aluminum up to 3.5, oxygen up to 0.25 and balance titanium. Preferably, molybdenum is 14 to 16, niobium is 2.5 to 3.5, silicon is 0.15 to 0.25, aluminum is 2.5 to 3.5 and oxygen is 0.12 to 0.16. The alloy may be in the form of a cold reduced sheet or foil product having a thickness of less than 0.1 inch. This product may be produced by cold rolling to effect a reduction within the range of 10 to 80%.

Abstract: High performance titanium alloys useful as impellers and disks for gas turbine engines are provided, together with processes for their preparation.

Abstract: The invention provides a titanium alloy having improved superplastic forming characteristics and mechanical characteristics. A titanium alloy having superplastic forming characteristics consisting essentially of about 5.5 to 6.75 wt. % Al, 3.5 to 4.5 wt. % V, 0.01 to 0.2 wt. % O, 0.85 to 3.15 wt. % Fe, 0.85 to 3.25 wt. % Mo, with 2.times.Fe wt. %+Mo wt. % being from 3 to 8, and balance titanium; said alloy containing .alpha.-crystals having a grain size below about 6 .mu.m in diameter. The Fe and Mo act as .beta.-stabilizing elements and contributing elements to lowering the beta transus and to the improvement of the superplastic characteristics.

Abstract: The quality or durability of an oxidation protective coating produced by alitizing or aluminizing on the surface of a structural component made of titanium or titanium alloy, is improved by adding niobium to the surface of the structural component. The addition may be accomplished prior to the aluminizing or during the aluminizing. Prior application may involve, for example, vapor deposition of the niobium. Simultaneous application involves including a niobium donator powder in the aluminizing powder mixture.

Abstract: A TiAl composition is prepared to have high strength and to have improved 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 by addition of tungsten and rapid solidification from the melt according to the approximate formula Ti.sub.50-48 Al.sub.48 W.sub.2-4.

Abstract: A titanium alloy comprising about 20 to 30 atomic percent (a/o) aluminum, about 3 to 5 a/o niobium, about 3 to 5 a/o vanadium, and about 3 to 5 a/o molybdenum, balance titanium. The alloy can be dispersion strengthened by the addition of small amounts, i.e. up to about 1 a/o of sulfur or rare earth dispersoids, such as Ce, Er or Y.

Abstract: A TiAl composition is prepared to have high strength and to have improved 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 by addition of chromium, carbon and niobium according to the approximate formula Ti.sub.51-43 Al.sub.46-50 Cr.sub.2 Nb.sub.1-5 C.sub.0.1.

Abstract: This invention relates to a process for making in-situ precipitated second phase in an intermetallic matrix, which composite is rapidly solidified to form a product. The invention also relates to a rapidly solidified product comprising a second phase in both a stable particulate form and a metastable flake form dispersed in an intermetallic matrix.

Abstract: This invention relates to a metallic-second phase composites comprising a matrix of titanium aluminide with discrete titanium silicide particles dispersed therein. The second phase dispersoid is stabilized during the process of in-situ formation by the presence of zirconium.

Abstract: Alpha titanium alloys containing aluminum, hafnium and/or tantalum has been found to have improved creep and tensile strengths as well as oxidation resistance at temperature up to about 700.degree. C. without embrittlement.

Abstract: A TiAl composition is prepared to have high strength and to have improved 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 by addition of gallium according to the approximate formula Ti.sub.52-47 Al.sub.42-46 Ga.sub.3-7.

Abstract: A high strength and corrosion resistant titanium alloy having excellent corrosion-wear properties may be prepared in that Al and Mo are added as alloying elements in specific amounts, and if Zr in a specific amount is further added, the strength and the corrosion-wear properties would be more improved.

Abstract: A TiAl composition is prepared to have high strength and to have improved ductility by altering the atomic ratio of the titanium and niobium to have what has been found to be a highly desirable effective aluminum concentration by addition of a combination of manganese and niobium according to the approximate formula Ti.sub.52-42 Al.sub.46-50 Nb.sub.1-5 Mn.sub.1-3.

Abstract: A TiAl composition is prepared to have high strength and to have improved 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 by addition of chromium and niobium according to the approximate formula --Ti.sub.50-46 Al.sub.46-50 Cr.sub.2 Nb.sub.2.

Abstract: An alloy is provided for use at high temperature. The alloy is a niobium-titanium base alloy and has the following approximate composition.______________________________________ Concentration in atomic percent Ingredient From About To About ______________________________________ Nb balance essentially Ti 31 48 Al 8 21.

Abstract: A method of improving the resistance of oil-well tubular products made of .alpha.-type or (.alpha.+.beta.)-type Ti-based alloys to corrosion in a deep-well environment at high temperatures is disclosed. The method is characterized by adding, as an alloying element, (A) at least one platinum group metal in an amount of 0.02-0.20% by weight, or (B) at least one platinum group metal in an amount of 0.005-0.12% by weight and optionally at least one of Ni, Co, W, and Mo in an amount of 0.05-2.00% by weight.

Abstract: A high strength, low modulus, ductile, biocompatible titanium base alloy containing one or more isomorphous beta stabilizers, eutectoid beta stabilizers and optional alpha stabilizers, characterized by a modulus of elasticity not exceeding 100 GPa; a method for the preparation of said alloy and prostheses made from said alloy.

Abstract: A TiAl composition is prepared to have high strength and to have improved 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 by addition of vanadium and rapid solidification from the melt according to the approximate formula Ti.sub.49 Al.sub.48 V.sub.3.

Abstract: The process according to the invention comprises the following stages:(a) an ingot of the following composition is produced (% by weight): Al 3.8 to 5.4, Sn 1.5 to 2.5, Zr 2.8 to 4.8, Mo 1.5 to 4.5, Cr<2.5 and Cr+V 1.5 to 4.5, Fe<2.0, Si<0.3, 0<0.15, the remainder being Ti and impurities;(b) the ingot undergoes hot working, comprising a rough-shaping and then a final working preceded by preheating in the beta range;(c) the blank of the part obtained is solid solution heat treated by maintaining it at a temperature 10.degree. to 40.degree. C. lower than its real "beta transus";(d) ageing for 4 to 12 h at between 550.degree. and 650.degree. C. is then carried out on the blank of the part or the part itself.The invention also relates to the process and the parts obtained under preferred conditions, said parts having in particular a good mechanical strength (Rm and R.sub.p0.2 respectively at least equal to 1200 and 1100 MPa), a good tenacity and a good creep resistance at 400.degree. C.

Abstract: Disclosed are Ti-Al alloys having increased ductility and Ti-Al alloys having increased ductility and lowered melting points, in both of which the main constituent phase is an intermetallic compound, TiAl.The Ti-Al alloys having increased ductility essentially consisting of Al: 28-38%, and B: 0.005-0.3%, the balance being Ti and inevitable impurities.Since the alloys of this type have good processability, they are suitable as materials for mechanical parts of rotating or reciprocating systems, where high heat-resistance and high specific strength are required.The Ti-Al alloys having increased ductility as well as lowered melting points essentially consisting of Al: 28-38%, one or two of Ni: 0.05-3.0% and Si: 0.05-3.0%, and the balance being Ti and inevitable impurities. Optionally, this alloy further contains B: 0.005-0.3%.The alloy of this type is, in addition to the above use, suitable for producing machine parts made by precision casting technology.

Abstract: A TiAl composition is prepared to have high strength and to have improved 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 by addition of chromium according to the approximate formula Ti.sub.52-50 Al.sub.46-48 Cr.sub.2.

Abstract: A TiAl composition is prepared to have high strength and to have improved ductility by altering the atomic ratio of the titanium and aluminum to have what has been found to be a higly desirable effective aluminum concentration by addition of boron according to the approximate compositions displayed in the shaded area of FIG. 10.

Abstract: A TiAl composition is prepared to have high strength and to have improved ductility by altering the atomic ratio of the titanium and aluminum to have what has been found to be highly desirable effective aluminum concentration by addition of tantalum according to the approximate formula Ti.sub.48 Al.sub.48 Ta.sub.4.

Abstract: A TiAl composition is prepared to have high strength and to have improved 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 by addition of silicon according to the approximate formula Ti.sub.54-57 Al.sub.39-41 Si.sub.4-5.

Abstract: A free-cutting Ti alloy is disclosed. The basic alloy composition of this free-cutting Ti alloy essentially consists of at least one of S: 0.001-10%, Se: 0.001-10% and Te: 0.001-10%; REM: 0.01-10%; and one or both of Ca: 0.001-10% and B: 0.005-5%; and the balance substantially Ti. The Ti alloy includes one or more of Ti-S (Se, Te) compounds, Ca-S (Se, Te) compounds, REM-S (Se, Te) compounds and their complex compounds as inclusions to improve machinability. Some optional elements can be added to above basic composition.Also disclosed are methods of producing the above free-cutting Ti alloy and a specific Ti alloy which is a particularly suitable material for connecting rods.

Abstract: A titanium aluminide base composition is provided which has increased tensile strength, ductility and rupture life due to the addition of tantalum coupled with optional additions of vanadium and columbium.

Abstract: The present invention relates to the reaction of hydrogen gas with alloys having body-centered cubic phase structure at a temperature of less than 100.degree. C. which comprise titanium and a second metal selected from the group consisting of zirconium, rhenium, manganese, and iron, and further comprising when the second metal is zirconium or rhenium, at least about 1 atom percent of a third metal selected from the group of aluminum, cobalt, chromium, iron, manganese, nickel, copper, silicon, germanium, gallium and mixtures thereof. The alloys of this invention react with hydrogen at a reaction rate much faster than prior art materials.

Abstract: Creep resistant titanium alloys containing aluminum, zirconium, molybdenum and germanium plus optional silicon, carbon, tin and niobium.

Abstract: The high temperature strength to density ratio of titanium aluminum niobium alloys of the Ti.sub.3 Al (alpha two) type is increased when molybdenum is added. New alloys contain by atomic percent 25-27 aluminum, 11-16 (niobium+molybdenum), 1-4 molybdenum, balance titanium. When vanadium replaces up to 3.5% molybdenum a lighter weight alloy is produced. The new alloys have higher elastic modulus and higher creep strength to density ratio than alloys without molybdenum.

Abstract: A heat-resistant alloy comprising an alloy based on an intermetallic compound TiAl composed of 60 to 70% by weight of titanium and 30 to 36% by weight of aluminum, and 0.1 to 5.0% by weight of manganese.

Abstract: A titanium alloy has greatly increased specific strength and increased thermostability. The alloy consists of a titanium matrix in which fibrous dispersoids are formed in situ. The dispersoids are rod and/or plate shaped and have a diameter or depth of about 0.1-0.5 microns and an aspect ratio of about 5-10. A typical alloy has the composition A-X where A is titanium or titanium alloy and X is boron, carbon, nitrogen, mixtures thereof, or mixtures with silicon.

Abstract: Alloys comprising titanium and aluminum, or titanium, aluminum and at least one of the metals M, wherein M is vanadium, zirconium, chromium, niobium, tantalum and/or iron, are facilely prepared by reducing an alkali metal fluotitanate, or coreducing admixture of an alkali metal fluotitanate and at least one halide of a metal M, with aluminum, in the presence of an alkali metal oxide reactive flux, either Na.sub.2 O and/or K.sub.2 O; next solubilizing with water the fluorine compounds of reduction/coreduction which are in admixture of reduction/coreduction with dispersion of the aforesaid metals in metallic state; separating said dispersion of metals in metallic state from said admixture of reduction/coreduction; and then alloying by melting and cooling said separated dispersion of metals in metallic state.

Abstract: As-cast titanium alloys characterized by fine grain structures are readily produced by inoculation of the alloys prior to or during the casting thereof with small amounts of at least one composition selected from the group consisting of titanium--0.4 to 15 weight percent carbon, titanium--1.4 to 6 weight percent nitrogen and titanium--1.3 to 10 weight percent oxygen.

Abstract: A titanium alloy comprising about 15 to 25 atomic percent (a/o) aluminum, about 0.05 to 12 a/o of at least one beta eutectoid stabilizing element and about 4 to 12 a/o of at least one beta isomorphous stabilizing element, balance titanium. The beta eutectoid element is at least one of Cu, Ni, Cr, Er, Y, Ce, Si, B or C. The beta isomorphous stabilizing element is Nb or a mixture of Nb with Ta, Mo or V, wherein the Nb can be replaced by Ta, Mo or V up to about half of the stated quantity.The presently preferred amounts of the beta eutectoid stabilizing elements are as follows: Cu, Ni or Cr, about 4.50 to 12.0 a/o; Si, B or C, about 0.70 to 5.0 a/o; Er, Y or Ce, about 0.05 to 0.25 a/o.