ALPHA-BETA TITANIUM ALLOYS HAVING ALUMINUM AND MOLYBDENUM, AND PRODUCTS MADE THEREFROM
New alpha-beta titanium alloys are disclosed. The new alloys generally include 7.0-11.0 wt. % Al, and 1.0-4.0 wt. % Mo, wherein Al:Mo, by weight, is from 2.0:1-11.0:1, the balance being titanium, any optional incidental elements, and unavoidable impurities. The new alloys may realize an improved combination of properties as compared to conventional titanium alloys.
1 . A titanium alloy comprising:
7.0-11.0 wt. % Al;
1.0-4.0 wt. % Mo;
wherein Al:Mo, by weight, is from 2.0:1-11.0:1;
the balance being Ti, optional incidental elements, and unavoidable impurities.
2 . The titanium alloy of claim 1 , wherein the alloy includes not greater than 10.5 wt. % Al.
3 . The titanium alloy of claim 1 , wherein the alloy includes not greater than 10.0 wt. % Al.
4 . The titanium alloy of claim 1 , wherein the alloy includes not greater than 9.5 wt. % Al.
5 . The titanium alloy of claim 1 , wherein the alloy includes not greater than 9.0 wt. % Al.
6 . The titanium alloy of claim 1 , wherein the alloy includes at least 1.5 wt. % Mo.
7 . The titanium alloy of claim 6 , wherein the alloy includes not greater than 3.5 wt. % Mo.
8 . The titanium alloy claim 6 , wherein the alloy includes not greater than 3.0 wt. % Mo.
9 . The titanium alloy of claim 6 , wherein the alloy includes not greater than 2.5 wt. % Mo.
10 . The titanium alloy of claim 7 , wherein the Al:Mo, by weight, is at least 2.33:1.
11 . The titanium alloy of claim 10 , wherein the Al:Mo, by weight, is not greater than 10.0:1.
12 . The titanium alloy of claim 10 , wherein the Al:Mo, by weight, is not greater than 6.33:1.
13 . The titanium alloy of claim 1 , wherein the titanium alloy is a titanium alloy body.
14 . The titanium alloy body of claim 13 , wherein the titanium alloy body is one of an ingot, a rolled product, an extrusion, a forging, a shape casting, or an additively manufactured product.
15 . The titanium alloy body of claim 13 , wherein the titanium alloy body is an automotive or aerospace component.
16 . The titanium alloy body of claim 15 , wherein the titanium alloy body is a turbine or engine component.
17 . A method comprising:
(i) using a feedstock in an additive manufacturing apparatus, wherein the feedstock comprises:
7.0-11.0 wt. % Al;
1.0-4.0 wt. % Mo;
wherein Al:Mo, by weight, is from 2.0:1-11.0:1;
the balance being Ti, optional incidental elements, and unavoidable impurities
(ii) producing a metal product in the additive manufacturing apparatus using the feedstock.
18 . The method of claim 17 , wherein the feedstock comprises a powder feedstock, wherein the method comprises:
(a) dispersing a metal powder of the powder feedstock in a bed and/or spraying a metal powder of the powder feedstock towards or on a substrate;
(b) selectively heating a portion of the metal powder above its liquidus temperature, thereby forming a molten pool;
(c) cooling the molten pool, thereby forming a portion of the metal product, wherein the cooling comprises cooling at a cooling rate of at least 100° C. per second; and
(d) repeating steps (a)-(c) until the metal product is completed.
19 . The method of claim 17 , wherein the feedstock comprises a wire feedstock, wherein the method comprises:
(a) using a radiation source to heat the wire feedstock above its liquidus point, thereby creating a molten pool;
(b) cooling the molten pool at a cooling rate of at least 1000° C. per second; and
(c) repeating steps (a)-(b) until the metal product is completed.
20 . The method of claim 17 , comprising cooling at a rate sufficient to form at least one precipitate phase, wherein the at least one precipitate phase comprises Ti 3 Al.