BCC MATERIALS OF TITANIUM, ALUMINUM, NIOBIUM, VANADIUM, AND MOLYBDENUM, AND PRODUCTS MADE THEREFROM
New beta-style (bcc) titanium alloys are disclosed. The new alloys generally include 4-8 wt. % Al, 4-8 wt. % Nb, 4-8 wt. % V, 1-5 wt. % Mo, optionally 2-6 wt. % Cr, the balance being titanium, 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:
4-8 wt. % Al;
4-8 wt. % Nb;
4-8 wt. % V;
1-5 wt. % Mo; and
optionally 2-6 wt. % Cr;
the balance being Ti, optional incidental elements, and unavoidable impurities.
2 . The titanium alloy of claim 1 , wherein the titanium alloy includes a sufficient amount of the Ti, the Al, the Nb, the V, the Mo, and the optional Cr to realize a beta transus temperature of not greater than 850° C.
3 . The titanium alloy of claim 1 , wherein the alloy includes at least 5.0 wt. % Al.
4 . The titanium alloy of claim 3 , wherein the alloy includes not greater than 7.0 wt. % Al.
5 . The titanium alloy of claim 1 , wherein the alloy includes at least 5.0 wt. % Nb.
6 . The titanium alloy of claim 5 , wherein the alloy includes not greater than 7.0 wt. % Nb.
7 . The titanium alloy of claim 1 , wherein the alloy includes at least 5.0 wt. % V.
8 . The titanium alloy of claim 7 , wherein the alloy includes not greater than 7.0 wt. % V.
9 . The titanium alloy of claim 1 , wherein the alloy includes at least 2.0 wt. % Mo.
10 . The titanium alloy of claim 9 , wherein the alloy includes not greater than 4.0 wt. % Mo.
11 . The titanium alloy of claim 1 , wherein the alloy includes 2-6 wt. % Cr.
12 . The titanium alloy of claim 11 , wherein the alloy includes at least 3.0 wt. % Cr.
13 . The titanium alloy of claim 12 , wherein the alloy includes not greater than 5.0 wt. % Cr.
14 . The titanium alloy of claim 1 , wherein the titanium alloy is a titanium alloy body.
15 . 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.
16 . A method comprising:
(i) using a feedstock in an additive manufacturing apparatus, wherein the feedstock comprises:
4-8 wt. % Al;
4-8 wt. % Nb;
4-8 wt. % V;
1-5 wt. % Mo; and
optionally 2-6 wt. % Cr;
the balance being Ti, optional incidental elements, and unavoidable impurities;
(ii) producing a metal product in the additive manufacturing apparatus using the feedstock.
17 . The method of claim 16 , 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.
18 . The method of claim 16 , 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.
19 . The method of claim 16 , comprising cooling at a rate sufficient to form at least one precipitate phase, wherein the at least one precipitate phase comprises Ti 3 Al.
20 . The method of claim 19 , wherein the metal product comprises at least 0.5 vol. % of Ti 3 Al.