Titanium alloy

Patent metadata

Field	Value
Publication number	US-2016201165-A1
Application number	US-201514594300-A
Country	US
Kind code	A1
Filing date	Jan 12, 2015
Priority date	Jan 12, 2015
Publication date	Jul 14, 2016
Grant date	—

Abstract

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.

First claim

What is claimed is:

1 . An alpha-beta titanium alloy comprising, 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; titanium; and incidental impurities.

2 . The alpha-beta titanium alloy according to claim 1 , wherein the molybdenum equivalency is in the range of 2.0 to 20.0.

3 . The alpha-beta titanium alloy according to claim 1 , wherein the alpha-beta titanium alloy exhibits a cold working reduction ductility limit of at least 25%.

4 . The alpha-beta titanium alloy according to claim 1 , wherein the alpha-beta titanium alloy exhibits a cold working reduction ductility limit of at least 35%.

5 . The alpha-beta titanium alloy according to claim 1 , wherein the alpha-beta titanium alloy exhibits a yield strength of at least 130 KSI (896.3 MPa) and a percent elongation of at least 10%.

6 . The alpha-beta titanium alloy according to claim 1 , further comprising greater than 0 up to 0.3 total weight percent of one or more of cerium, praseodymium, neodymium, samarium, gadolinium, holmium, erbium, thulium, yttrium, scandium, beryllium, and boron.

7 . The alpha-beta titanium alloy according to claim 6 , wherein the molybdenum equivalency is in the range of 0 to 10.

8 . The alpha-beta titanium alloy according to claim 1 , further comprising greater than zero up to 0.5 total weight percent of one or more of gold, silver, palladium, platinum, nickel, and iridium.

9 . The alpha-beta titanium alloy according to claim 8 , wherein the aluminum equivalency is in the range of 1.0 to 6.0 and the molybdenum equivalency is in the range of 0 to 10.

10 . The alpha-beta titanium alloy according to claim 6 , further comprising greater than 0 up to 0.5 total weight percent of one or more of gold, silver, palladium, platinum, nickel, and iridium.

11 . The alpha-beta titanium alloy according to claim 1 , further comprising one or more of:
greater than 0 to 6 tin; greater than 0 to 0.6 silicon; and greater than 0 to 10 zirconium.

12 . An alpha-beta titanium alloy comprising, in weight percentages:
2.0 to 7.0 aluminum; a molybdenum equivalency in the range of 2.0 to 5.0; 0.3 to 4.0 cobalt; up to 0.5 oxygen; up to 0.25 nitrogen; up to 0.3 carbon; up to 0.4 of incidental impurities; and titanium.

13 . The alpha-beta titanium alloy according to claim 12 , further comprising one or more of:
greater than 0 to 6 tin; greater than 0 to 0.6 silicon; greater than 0 to 10 zirconium; greater than 0 to 0.3 palladium; and greater than 0 to 0.5 boron.

14 . The alpha-beta titanium alloy according to claim 12 , further comprising greater than 0 up to 0.3 total weight percent of one or more of cerium, praseodymium, neodymium, samarium, gadolinium, holmium, erbium, thulium, yttrium, scandium, beryllium, and boron.

15 . The alpha-beta titanium alloy according to claim 12 , further comprising greater than 0 up to 0.5 total weight percent of one or more of gold, silver, palladium, platinum, nickel, and iridium.

16 . The alpha-beta titanium alloy according to claim 12 , wherein the alpha-beta titanium alloy exhibits a cold working reduction ductility limit of at least 25%.

17 . The alpha-beta titanium alloy according to claim 12 , wherein the alpha-beta titanium alloy exhibits a cold working reduction ductility limit of at least 35%.

18 . The alpha-beta titanium alloy according to claim 12 , wherein the alpha-beta titanium alloy exhibits a yield strength of at least 130 KSI (896.3 MPa) and a percent elongation of at least 10%.

19 . A method of forming an article from metallic form comprising an alpha-beta titanium alloy, the method comprising:
cold working a metallic form to at least a 25 percent reduction in cross-sectional area; wherein the metallic form comprises the alpha-beta titanium alloy of claim 1 ; and wherein the metallic form does not exhibit substantial cracking after cold working.

20 . The method of claim 19 , wherein cold working the metallic form comprises cold working the metallic form to at least 35 percent reduction.

21 . The method of claim 19 , wherein cold working the metallic form comprises one or more of rolling, forging, extruding, pilgering, rocking, drawing, flow-turning, liquid compressive forming, gas compressive forming, hydro-forming, bulge forming, roll forming, stamping, fine-blanking, die pressing, deep drawing, coining, spinning, swaging, impact extruding, explosive forming, rubber forming, back extrusion, piercing, stretch forming, press bending, electromagnetic forming, and cold heading.

22 . The method of claim 19 , wherein cold working the metallic form comprises cold rolling.

23 . The method of claim 19 , wherein cold working the metallic form comprises working the metallic form at a temperature less than 1250° F. (676.7° C.).

24 . The method of claim 19 , wherein cold working the metallic form comprises working the metallic form at a temperature no greater than 575° F. (300° C.).

25 . The method of claim 19 , wherein cold working the metallic form comprises working the metallic form at a temperature less than 392° F. (200° C.).

26 . The method of claim 19 , wherein cold working the metallic form comprises working the metallic form at a temperature in a range of −148° F. (−100° C.) to 392° F. (200° C.).

27 . The method of claim 19 , wherein the metallic form is selected from an ingot, a billet, a bloom, a beam, a bar, a tube, a slab, a rod, a wire, a plate, a sheet, an extrusion, and a casting.

28 . The method of claim 19 , further comprising hot working the metallic form prior cold working the metallic form.

29 . A method of forming an article from an alpha-beta titanium alloy, comprising:
providing an alpha-beta titanium alloy comprising, in weight percentages, 2.0 to 7.0 aluminum, a molybdenum equivalency in the range of 2.0 to 5.0, 0.3 to 4.0 cobalt, up to 0.5 oxygen, up to 0.25 nitrogen, up to 0.3 carbon, up to 0.4 of incidental impurities, and titanium; cold working the alpha-beta titanium alloy to at least a 25 percent reduction; wherein the alpha-beta titanium alloy does not exhibit substantial cracking after cold working.

30 . The method of claim 29 , wherein cold working the alpha-beta titanium alloy comprises cold working the alpha-beta titanium alloy to a reduction of at least 35 percent.

31 . The method of claim 29 , wherein cold working the alpha-beta titanium alloy comprises one or more of rolling, forging, extruding, pilgering, rocking, drawing, flow-turning, liquid compressive forming, gas compressive forming, hydro-forming, bulge forming, roll forming, stamping, fine-blanking, die pressing, deep drawing, coining, spinning, swaging, impact extruding, explosive forming, rubber forming, back extrusion, piercing, stretch forming, press bending, electromagnetic forming, and cold heading.

32 . The method of claim 29 , wherein cold working the alpha-beta titanium alloy comprises cold rolling the alpha-beta titanium alloy.

33 . The method of claim 29 , wherein cold working the alpha-beta titanium alloy comprises working the alpha-beta titanium alloy at a temperature less than 1250° F. (676.7° C.).

34 . The method of clai

Assignees

• Ati Properties Inc

Inventors

• Foltz Iv John W

Classifications

• C22F1/183

  of titanium or alloys based thereon · CPC title

• C22C14/00 Primary

  Alloys based on titanium · CPC title

• C22C1/02

  by melting {(C22C1/1036 takes precedence)} · CPC title