Beta-type titanium alloy and product thereof

Abstract

The present invention provides a beta-type titanium alloy including, by weight %: Nb: 10 to 25%; Cr: 1 to 10%; at least one of Zr: 10% or less and Sn: 8% or less, satisfying Zr+Sn being 10% or less; and the balance of Ti and inevitable impurities, the alloy having Young's modulus of 100 GPa or less, a process for producing the beta-type titanium alloy, and a beta-type titanium alloy product.

Description

Claims

1. A beta-type titanium alloy comprising, by weight %: Nb: 10 to 25%;Cr: 1 to 10%;at least one of Zr: 10% or less and Sn: 8% or less, satisfying Zr+Sn being 10% or less; andthe balance of Ti and inevitable impurities,the alloy having Young's modulus of 100 GPa or less.

2. The beta-type titanium alloy according to claim 1, which further comprises Al of 6% or less.

3. The beta-type titanium alloy according to claim 1, which further comprises Fe of 5% or less.

4. The beta-type titanium alloy according to claim 1, which further comprises:Al: 6% or less; andFe: 5% or less.

5. A process for producing the beta-type titanium alloy according to claim 1, the process comprising: melting a raw material comprising at least one selected from the group consisting of Nb—Cr alloy, Nb—Fe alloy and Nb—Al alloy.

6. A process for producing the beta-type titanium alloy according to claim 2, the process comprising: melting a raw material comprising at least one selected from the group consisting of Nb—Cr alloy, Nb—Fe alloy and Nb—Al alloy.

7. A process for producing the beta-type titanium alloy according to claim 3, the process comprising: melting a raw material comprising at least one selected from the group consisting of Nb—Cr alloy, Nb—Fe alloy and Nb—Al alloy.

8. A process for producing the beta-type titanium alloy according to claim 4, the process comprising: melting a raw material comprising at least one selected from the group consisting of Nb—Cr alloy, Nb—Fe alloy and Nb—Al alloy.

9. A beta-type titanium alloy product obtained from the beta-type titanium alloy according to claim 1 by any one of the following steps: a) melting-cold working;b) melting-solution treatment-cold working;c) melting-cold working-aging treatment; andd) melting-solution treatment-cold working-aging treatment.

10. A beta-type titanium alloy product obtained from the beta-type titanium alloy according to claim 2 by any one of the following steps: a) melting-cold working;b) melting-solution treatment-cold working;c) melting-cold working-aging treatment; andd) melting-solution treatment-cold working-aging treatment.

11. A beta-type titanium alloy product obtained from the beta-type titanium alloy according to claim 3 by any one of the following steps: a) melting-cold working;b) melting-solution treatment-cold working;c) melting-cold working-aging treatment; andd) melting-solution treatment-cold working-aging treatment.

12. A beta-type titanium alloy product obtained from the beta-type titanium alloy according to claim 4 by any one of the following steps: a) melting-cold working;b) melting-solution treatment-cold working;c) melting-cold working-aging treatment; andd) melting-solution treatment-cold working-aging treatment.

13. The beta-type titanium alloy product obtained by casting the beta-type titanium alloy according to claim 1.

14. The beta-type titanium alloy product obtained by casting the beta-type titanium alloy according to claim 2.

15. The beta-type titanium alloy product obtained by casting the beta-type titanium alloy according to claim 3.

16. The beta-type titanium alloy product obtained by casting the beta-type titanium alloy according to claim 4.