High-strength alpha-beta titanium alloy
AssigneeTitanium Metals Corporation
InventorsRoger Thomas, Paul Garratt, Matthew Thomas, Yoji Kosaka
Life of this patent
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Abstract
An alpha-beta titanium alloy comprises Al at a concentration of from about 4.7 wt. % to about 6.0 wt. %; V at a concentration of from about 6.5 wt. % to about 8.0 wt. %; Si at a concentration of from about 0.15 wt. % to about 0.6 wt. %; Fe at a concentration of up to about 0.3 wt. %; O at a concentration of from about 0.15 wt. % to about 0.23 wt. %; and Ti and incidental impurities as a balance. The alpha-beta titanium alloy has an Al/V ratio of from about 0.65 to about 0.8, where the Al/V ratio is defined as the ratio of the concentration of Al to the concentration of V in the alloy, with each concentration being in weight percent (wt %).
Claims24
A high-strength alpha-beta titanium alloy comprising:
- Al at a concentration of from about 4.7 wt. % to about 6.0 wt. %;
- V at a concentration of from about 6.5 wt. % to about 8.0 wt. %;
- Si at a concentration of from about 0.15 wt. % to about 0.6 wt. %;
- Fe at a concentration of up to about 0.3 wt. %;
- O at a concentration of from about 0.15 wt. % to about 0.23 wt. %;
- and
- Ti and incidental impurities as a balance,
- wherein an Al/V ratio is from about 0.65 to about 0.8, the Al/V ratio being equal to the concentration of the Al divided by the concentration of the V in weight percent.
A high-strength alpha-beta titanium alloy comprising:
- Al at a concentration of from about 4.7 wt. % to about 6.0 wt. %;
- V at a concentration of from about 6.5 wt. % to about 8.0 wt. %;
- Si and O, each at a concentration of less than 1 wt. %;
- Ti and incidental impurities as a balance,
- wherein an Al/V ratio is from about 0.65 to about 0.8, the Al/V ratio being equal to the concentration of the Al divided by the concentration of the V in weight percent, and
- wherein the alloy comprises a yield strength of at least about 970 MPa and a fracture toughness of at least about 40 MPa·m1/2 at room temperature.
A method of making a high-strength alpha-beta titanium alloy comprising:
- forming a melt comprising:
- Al at a concentration of from about 4.7 wt. % to about 6.0 wt. %;
- V at a concentration of from about 6.5 wt. % to about 8.0 wt. %;
- Si at a concentration of from about 0.15 wt. % to about 0.6 wt. %;
- Fe at a concentration of up to about 0.3 wt. %;
- O at a concentration of from about 0.15 wt. % to about 0.23 wt. %;
- and
- Ti and incidental impurities as a balance, wherein an Al/V ratio is from about 0.65 to about 0.8, the Al/V ratio being equal to the concentration of the Al divided by the concentration of the V in weight percent;
- and
- solidifying the melt to form an ingot.
Dependencies are inferred from the claim text.