Abstract: A method for providing improved castability in a gamma titanium aluminide is taught. The method involves adding inclusions to the near stoichiometric titanium aluminide and specifically low chromium and high niobium inclusions. Niobium additions are made in concentrations between 6 and 14 atomic percent. Chromium additions are between 1 and 3 atom percent. Property improvements are also achieved.A preferred composition is according to the following expression:Ti--i Al.sub.46--48 Cr.sub.1--3 Nb.sub.

Abstract: A method for producing fiber reinforced titanium alloy articles which comprises casting a plurality of segments which can be joined to provide a unitary article, wherein at least one-half of the segments comprise at least one shallow cavity, treating the cast segments in such manner as to refine the microstructure of the segments, filling the cavity or cavities with reinforcing fibers and superplastic forming/diffusion bonding the segments into the desired article.

Abstract: A process for manufacturing rolled articles of titanium material comprising steps of contacting heated titanium material with fluorine- or fluoride-containing gas to form a fluoride layer on the surface of the titanium material, removing the fluoride layer formed thereon just before rolling and then rolling the titanium material to give a rolled article. With this structure, passive coat layers, such as the oxide layer on the surface of the titanium material is changed to a fluoride layer. The fluoride layer protects the surface of the titanium material. Therefore even if there is space of time between formation and removal of the fluoride layer, the fluoride layer formed on the surface of the titanium material protects the same surface in a favorable condition, which results in preventing re-formation of an oxide layer on the titanium material surface.

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 an effective aluminum concentration and by addition of chromium, boron, and niobium according to the approximate formula Ti-Al.sub.46-48 Cr.sub.2 Nb.sub.2 B.sub.0.1-0.2. The composition is preferably prepared by casting, homogenization at a high temperature, and forging the homogenized casting.

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: The invention relates to a process for improving the aging response and uniformity in a beta titanium alloy comprising the steps of:(a) cold working said beta titanium alloy to at least about 5% so that a reasonable degree of recrystallization can be obtained during subsequent solution treatment;(b) pre-aging said cold worked alloy at about 900.degree. to about 1300.degree. F. for a time in excess of about 5 minutes to obtain a pre-aged alloy;(c) solution treating said pre-aged alloy at a time and temperature to achieve a reasonable degree of recrystallization of said pre-aged alloy above the beta transus; and(d) aging said solution treated alloy at temperature and times to achieve a pre-aged, solution treated and aged beta titanium alloy substantially in a state of metallurgical equilibrium.

Abstract: A high strength, light weight "in-situ" Ti-Y composite is produced by deformation processing a cast body having Ti and Y phase components distributed therein. The composite comprises elongated, ribbon-shaped Ti and Y phase components aligned along an axis of the deformed body.

Abstract: This is an improved method of fabricating Zircaloy-4 strip. The method is of the type wherein Zircaloy-4 material is vacuum melted, forged, hot reduced, beta-annealed, quenched, hot rolled, subjected to a post-hot-roll anneal and then reduced by at least two cold rolling steps, including a final cold rolling to final size, with intermediate annealing between the cold rolling steps and with a final anneal after the last cold rolling step. The improvement comprises: (a) utilizing a maximum processing temperature of 620.degree. C. between the quenching and the final cold rolling to final size; (b) utilizing a maximum intermediate annealing temperature of 520.degree. C.; and (c) utilizing hot rolling, post-hot-roll annealing, intermediate annealing and final annealing time-temperature combinations to give an A parameter of between 4.times.10.sup.-19 and 7.times.10.sup.

Abstract: A process for producing a workpiece from an alloy containing dopant and based on titanium aluminide. The process is intended to produce a workpiece of high oxidation and corrosion resistance, good high-temperature strength and adequate ductility. The process steps include melting the alloy, casting the melt to produce a cast body, cooling the cast body to room temperature and removing its casting skin and its scale layer. The descaled cast body is subjected to high-temperature isostatic pressing at a temperature between 1200.degree. and 1300.degree. C. and a pressure between 100 and 150 MPa, and cooling the isostatically pressed cast body. The cooled cast body is heated to temperatures of 1050.degree. to 1200.degree. C., deformed isothermally one or more times at this temperature for the purpose of molding and structure improvement, and cooled to room temperature. The deformed cast body is machined to produce a workpiece by material removal.

Abstract: A method of manufacturing a titanium alloy magnetic disk substrate comprising (a) cold-rolling an alloy plate at a rolling ratio of no less than 30%, the alloy plate comprising 0.5 wt. % to 1.0 wt. % of Mo and containing oxygen, nitrogen and carbon in amounts such that O+2N+0.75C is from 0.03 wt. % to 0.5 wt. % of the titanium alloy, and the balance being Ti, wherein O is the wt. % of oxygen, N is the wt. % of nitrogen and C is the wt. % of C to form a magnetic disk substrate material and then (b) thermal-flattening the magnetic substrate material from step (a) under a condition defined as follows:500.ltoreq.T.ltoreq.-(150/11).multidot.t+7,850/11 1.ltoreq.twhere T represents a thermal-flattening temperature in .degree.C., and t represents a thermal-flattening time in hours.

Abstract: A process as described for treating Ti.sub.3 Al-based alloys comprising, in ddition to titanium and aluminum as .alpha.-phase-stabilizing element, niobium and further elements stabilizing the .beta.-phase in an amount of from 20 to 30% by weight, wherein the further elements stabilizing the .beta. phase are present in an amount of at least 4% by weight by(a) preparing the alloys by melting or via the powder-metallurgical route,(b) deforming at a temperature within the (.alpha..sub.2 +.beta.)-phase area by more than 60% in one or more steps with stress-relief annealing without complete recrystallization effected between these steps,(c) solution annealing the formed part for from 5 minutes to 120 minutes below the .beta.-transus temperature of the alloy,(d) quenching, and(e) subsequent aging/stress-relief annealing at temperatures within the range of from 500.degree. for 75.degree. C. for from 0.5 to 24 hours.

Abstract: Disclosed is a process of surface hardening of Ti-6A1-4V alloy that can be performed by electrolytic charging in an acid solution, subsequent solution treatment, followed by dehydrogenation to obtain an equiaxed alpha grain in transformed beta matrix. Surface hardnesses of the processed specimens are better than that of the mill-annealed specimen. The depth of hardened layer depends on the charging time.

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

Abstract: There is disclosed an engine valve of titanium alloy having a stem portion made of a cold-worked titanium alloy containing 2% to 4% by weight of aluminum, 1.5% to 3.5% by weight of vanadium and balance titanium. The engine valve suitable for use as an intake valve has a head portion made of a cast titanium alloy containing 2% to 7% by weight of aluminum, 3% to 20% by weight of vanadium and balance titanium. Moreover, an exhaust engine valve has a head portion made of a cast titanium alloy containing 5% to 10% by weight of aluminum and balance titanium.

Abstract: An alpha-beta titanium-base alloy, and fastener made therefrom. The alloy has a combination of an ultimate tensile strength of at least 220 ksi with a minimum elongation of 7% in the solution-treated and aged condition. The alloy has a total beta stabilizer content of 15 to 20%, a total alpha stabilizer content of 1.5 to 3.5% and balance titanium. The alloy may have an aluminum equivalence of at least 3.0%, preferably 4.0%. The alloy may have an aluminum content of at least 1.5%. The beta stabilizer element may be at least one vanadium, molybdenum or iron and the alpha stabilizer element may be one or more of aluminum, oxygen, carbon and nitrogen.

Abstract: In a process for cold forming unalloyed titanium high strength and ductility, in particular high bendability, are obtained if the material is subjected to intermediate annealing at a temperature of up to 500.degree. C.

Abstract: A process for manufacturing seamless titanium alloy tubes or pipes having good corrosion resistance and good mechanical properties from a titanium alloy which consists essentially, by weight, of one or more of the platinum group metals in a total amount of 0.01-0.14%, at least one of Ni and Co each in an amount of 0.1%-2.0%, no more than 0.35% of oxygen, not more than 0.30% of iron, optionally at least one of Mo, W, and V each in an amount of 0.1%-2.0%, and a balance of Ti. The process comprises preparing a billet by hot working after preheating in a temperature range of from 650.degree. C. to a temperature 100.degree. C. above the beta-transus point and subjecting the billet to tube extrusion after preheating in a temperature range of from 650.degree. C. to a temperature 100.degree. C. above the beta-transus point, optionally followed by at least one of annealing, cold drawing, and cold or warm rolling.

Abstract: This present invention is characterized in that a titanium material on an .alpha. or (.alpha.+.beta.) titanium alloy material hydrogenated in an amount of 0.02 to 2% by weight of hydrogen is heated to a temperature above the .beta. transformation point and below 1100.degree. C., is hot worked in that temperature range at a reduction of 30% or more, the hot working is terminated in a .beta. single phase temperature region, and cooling to 400.degree. C. or less, and annealing in vacuum are then carried out, whereby titanium and titanium alloy materials having a fine acicular microstructure are obtained.

Abstract: High performance Ti-6A1-4V alloys skewed with oxygen and nitrogen and useful as impellers are provided and a process for their preparation.