285 results about "Beta titanium alloy" patented technology

A method of forming an article from an alpha-beta titanium including, in weight percentages, from about 2.9 to about 5.0 aluminum, from about 2.0 to about 3.0 vanadium, from about 0.4 to about 2.0 iron, from about 0.2 to about 0.3 oxygen, from about 0.005 to about 0.3 carbon, from about 0.001 to about 0.02 nitrogen, and less than about 0.5 of other elements. The method comprises cold working the alpha-beta titanium alloy.

PCT No. PCT/JP95/01897 Sec. 371 Date Mar. 19, 1997 Sec. 102(e) Date Mar. 19, 1997 PCT Filed Sep. 20, 1995A method of straightening a wire rod of titanium or titanium alloy wherein the rod is hot-straightened to a straight rod at the straightening temperature T and elongation epsilon satisfying the expression (1) or (2). The method includes hot rolling a titanium billet of beta titanium alloy, ( alpha + beta ) titanium alloy or a near alpha titanium alloy into a wire rod, winding the hot rolled wire rod into a coil, cold drawing the wire rod, cutting the wire rod to obtain a bent wire rod, heating the bent wire rod to a straightening temperature T while both end portions of the bent wire rod are fixed, applying a predetermined elongation epsilon to the wire rod, maintaining a straightening temperature T, hot-straightening the wire in accordance with the expression (2) epsilon (T-400)>/=400(1) epsilon (T-500)>/=200(2) and cooling the wire rod while applying tension. The method is suitable for preparing a straight rod for use in an engine valve.

An article of manufacture selected from a titanium alloy fastener and a titanium alloy fastener stock including an alpha/beta titanium alloy comprising, in percent by weight: 3.9 to 4.5 aluminum; 2.2 to 3.0 vanadium; 1.2 to 1.8 iron; 0.24 to 0.3 oxygen; up to 0.08 carbon; up to 0.05 nitrogen; titanium; and up to a total of 0.3 of other elements. In certain embodiments, article of manufacture has an ultimate tensile strength of at least 170 ksi (1,172 MPa) and a double shear strength of at least 103 ksi (710.2 MPa). A method of manufacturing a titanium alloy fastener and a titanium alloy fastener stock comprising the alpha/beta alloy is disclosed.

An article of manufacture selected from a titanium alloy fastener and a titanium alloy fastener stock including an alpha/beta titanium alloy comprising, in percent by weight: 3.9 to 5.4 aluminum; 2.2 to 3.0 vanadium; 1.2 to 1.8 iron; 0.24 to 0.3 oxygen; up to 0.08 carbon; up to 0.05 nitrogen; titanium; and up to a total of 0.3 of other elements. In certain embodiments, article of manufacture has an ultimate tensile strength of at least 170 ksi (1,172 MPa) and a double shear strength of at least 103 ksi (710.2 MPa). A method of manufacturing a titanium alloy fastener and a titanium alloy fastener stock comprising the alpha/beta alloy is disclosed.

A near-beta or beta titanium alloy having high strength, high ductility, and high toughness which is capable of coil rolling at a high temperature and recoiling for high productivity, and a process for producing said titanium alloy. The titanium alloy contains not more than 1.0% (excluding 0%) of Si alone or in combination with not more than 10% of Sn. The process comprises heating a beta alloy or near-beta alloy containing not more than 1.0% (excluding 0%) of Si alone or in combination with not more than 10% of Sn and subjecting said alloy to plastic deformation while keeping silicides solved in it at a temperature above the beta-transus, so that silicides precipitate in the form of fine particles, with recrystallization suppressed. The resulting titanium alloy is good in workability and has high strength after aging treatment.

Various non-limiting embodiments of the present invention relate to methods of processing titanium alloys wherein the alloys are subjected to deformation above the beta transus temperature (T_β) of the alloys. For example, one non-limiting embodiment provides a method of processing an alpha+beta or a near-beta titanium alloy comprising deforming a body of the alloy at a first temperature (T₁) that is above the T_β of the alloy; recrystallizing at least a portion of the alloy by deforming and/or holding the body at a second temperature (T₂) that is greater than T₁; and deforming the body at a third temperature (T₃), wherein T₁≧T₃>T_β; wherein essentially no deformation of the body occurs at a temperature below T_β during the method of processing the titanium alloy.

Metastable beta titanium alloys and methods of processing metastable β-titanium alloys are disclosed. For example, certain non-limiting embodiments relate to metastable β-titanium alloys, such as binary β-titanium alloys comprising greater than 10 weight percent molybdenum, having tensile strengths of at least 150 ksi and elongations of at least 12 percent. Other non-limiting embodiments relate to methods of processing metastable β-titanium alloys, and more specifically, methods of processing binary β-titanium alloys comprising greater than 10 weight percent molybdenum, wherein the method comprises hot working and direct aging the metastable β-titanium alloy at a temperature below the β-transus temperature of the metastable β-titanium alloy for a time sufficient to form α-phase precipitates in the metastable β-titanium alloy. Articles of manufacture comprising binary β-titanium alloys according to various non-limiting embodiments disclosed herein are also disclosed.

An alpha/beta titanium alloy comprising, in percent by weight based on total alloy weight: 3.9 to 4.5 aluminum; 2.2 to 3.0 vanadium; 1.2 to 1.8 iron; 0.24 to 0.30 oxygen; up to 0.08 carbon; up to 0.05 nitrogen; up to 0.015 hydrogen ; titanium; and up to a total of 0.30 of other elements. A non-limiting embodiment of the alpha/beta titanium alloy comprises an aluminum equivalent value in the range of 6.4 to 7.2, exhibits a yield strength in the range of 120 ksi (827.4 MPa) to 155 ksi (1,069 MPa), exhibits an ultimate tensile strength in the range of 130 ksi (896.3 MPa) to 165 ksi (1,138 MPa), and exhibits a ductility in the range of 12 to 30 percent elongation.

The invention relates to a titanium alloy material, in particular to a multi-functional biomedical metastable beta titanium alloy material with excellent processing performance, and belongs to the technical field of titanium alloy material preparation. The alloy contains the following ingredients by mass: 18-27% of Nb, 0.5-2% of Mo, 3-5% of Zr, 7-9% of Sn, 0.1-0.3% of O and the balance of Ti. The titanium alloy has excellent comprehensive performance, and the strength and the elastic modulus of the alloy can be regulated through different thermal treatments. The elastic modulus E of the alloy is 40-7 3GPa, the yield strength sigma 0.2 is 260-864 MPa, the tensile strength sigma b is 686-1094 MPa, the elongation rate epsilon = 4-20%, and the facture surface shrinkage rate is 20-52%. The titanium alloy does not contain toxic elements, such as Al and V, and has excellent corrosion resistance, biocompatibility and cold processing performance. The titanium alloy can be used for manufacturing tissue repairing or substituting materials, such as artificial bones, artificial joints and bone plates.

A method for increasing tensile strength of a cold workable alpha-beta titanium alloy comprises solution heat treating a cold workable alpha-beta titanium alloy in a temperature range of T_β-106° C. to T_β-72.2° C. for 15 minutes to 2 hours; cooling the alpha-beta titanium alloy at a cooling rate of at least 3000° C./minute; cold working the alpha-beta titanium alloy to impart an effective strain in the range of 5 percent to 35 percent in the alloy; and aging the alpha-beta titanium alloy in a temperature range of T_β-669° C. to T_β-517° C. for 1 to 8 hours. Fastener stock and fasteners including solution treated, quenched, cold worked, and aged alpha-beta titanium alloys are also disclosed.

The invention relates to a biomedical beta-titanium alloy material with low elastic modulus. The preparation method for the material comprises the steps of raw material preparation, raw material smelting, cogging, forging and the like, namely the method comprises the following steps: preparing a raw material alloy of Nb, Zr, Sn, Ta, Mo and Ti according to a certain proportion, mechanically stirring and mixing the alloy, then pressing the alloy on a hydraulic press to form electrodes, and later smelting the electrodes in a vacuum consumable electro-arc furnace to obtain cast ingots of the beta-titanium alloy material; taking out the cast ingots with certain diameter, heating the cast ingots in a vacuum furnace and then preserving the heat, upsetting and drawing out the heated cast ingots on the hydraulic press or a forging device, and repeating the step twice to thrice to obtain a forging stock of the beta-titanium alloy material; heating the forging stock in the vacuum furnace and then preserving the heat, drawing out the heated forging stock on the hydraulic press or the forging device to obtain the biomedical beta-titanium alloy material with the elastic modulus E of 50 to 80GPa. The alloy has the characteristic of low elastic modulus, has good combination properties such as tensile strength, yield strength, corrosion resistance and the like, and does not contain toxic elements to human body.

The present invention discloses one kind of biomedicine beta-titanium alloy material comprising Ti-Nb 25-30 wt%, Zr 1-5 wt%, Fe 0.2-1 wt%, and Ta 10-15 wt%. The beta-titanium alloy material is produced through vacuum arc melting, casting, vacuum homogenizing under the protection of argon, cold rolling, forming solid solution, water quenching, artificial ageing, water cooling and other steps. It is produced into 2 mm thick plate, and has excellent comprehensive performances, including elastic modulus 40-60 GPa, breaking strength 600-910 MPa, yield strength 480-650 MPa, elongation 14-18 % and reduction of area 40-52 %. It has simple and reliable production process.

An alpha-beta titanium alloy comprises, in weight percentages: an aluminum equivalency in the range of 2.0 to 10.0; a molybdenum equivalency in the range of 0 to 20.0; 0.3 to 5.0 cobalt; and titanium. In certain embodiments, the alpha-beta titanium alloy exhibits a cold working reduction ductility limit of at least 25%, a yield strength of at least 130 KSI (896.3 MPa), and a percent elongation of at least 10%. A method of forming an article comprising the cobalt-containing alpha-beta titanium alloy comprises cold working the cobalt-containing alpha-beta titanium alloy to at least a 25 percent reduction in cross-sectional area. The cobalt-containing alpha-beta titanium alloy does not exhibit substantial cracking during cold working.

The invention provides a preparation method of a beta titanium alloy tube. The method comprises the following steps of: 1, performing one-pass cogging and rolling on the beta titanium alloy tube by using a cold pilger mill to obtain a rough rolled tube blank; 2, performing first solution treatment on the rough rolled tube blank; 3, removing defects on the inner and outer surfaces of the rough rolled tube blank, and then performing multi-pass precision rolling by using the cold pilger mill, and orderly performing second solution treatment, sandblasting treatment and acid pickling treatment after each pass of precision rolling to obtain a finish-rolled tube blank; and 4, performing aging treatment to obtain the beta titanium alloy tube having the outer diameter of 20 mm to 133 mm and the wall thickness of 1 mm to 5 mm. The preparation method provided by the invention is simple in preparation process, high in material utilization rate, low in production cost and short in production period; the beta titanium alloy tube prepared by using the preparation method provided by the invention is even in structure; the crystalline grains of the beta titanium alloy tube are fine and dispersed; and the beta titanium alloy tube is excellent in mechanical properties, and can be widely applied to the fields such as war industry, civilian use and the like.

The invention relates to a beta titanium alloy, in particular to a beta titanium alloy with low cost and high strength and a preparation method thereof. The beta titanium alloy comprises the following components in mass percentage: 0.5%-2.5% of ferrum, 1.5%-3.5% of aluminum, 2%-4% of chromium, 6%-11% of niobium and the balance of titanium. The preparation method comprises the following steps of: smelting sponge-state titanium and then smelting the smelted titanium with ferrum, aluminum, chromium and niobium to obtain a beta titanium alloy ingot; and cooling the beta titanium alloy ingot along with a furnace after uniform heat treatment, hot rolling the cooled beta titanium alloy ingot into a sheet alloy material, cutting the sheet alloy material into samples, carrying out ice water quenching after solution treatment and then carrying out ageing treatment to obtain the beta titanium alloy with high strength. The results of stretching experiments indicate that the room-temperature tensile strength of the beta titanium alloy in the solution state is above 850 MPa, and the elongation is above 15%; and the room-temperature tensile strength of the beta titanium alloy in the ageing state is above 1300 MPa, the elongation is above 4%, the strength of the beta titanium alloy can achieve above 1300 MPa, and meanwhile, the beta titanium alloy keeps a certain plasticity.