Method for enhancing mechanical strength of a titanium alloy by aging

• US 20130139933A1
• Filed: 12/06/2012
• Published: 06/06/2013
• Est. Priority Date: 12/06/2011
• Status: Abandoned Application

• Current Assignee: National Cheng KUNG University (Government of The Republic of China)
• Original Assignee: National Cheng KUNG University (Government of The Republic of China)
• Inventors: JU, Chien-Ping, LIN, Jiin-Huey Chern
• Application Number:
  US13/706,377
• Publication Number:
  US 20130139933A1
• Time in Patent Office: Days
• US Class Current: 148/669
• CPC Class Codes: C22C 14/00 Alloys based on titanium
• CPC Class Codes: C22F 1/183 of titanium or alloys based thereon

Abstract

A titanium-molybdenum alloy having α″ phase as a major phase is subjected to an aging treatment, so that yield strength of the aged alloy is increased by 10% to 120% with elongation to failure thereof being not less than about 5.0%.

Claims

1. A method for enhancing mechanical strength of an article of a titanium alloy by aging comprising providing an article of a titanium-molybdenum alloy having α

″

phase as a major phase; and

aging said article, so that yield strength of said aged article is increased by 10% to 120%, based on the yield strength of said article, with elongation to failure of said aged article being not less than about 5.0%.

2. The method of claim 1, wherein the yield strength of said aged article is increased by at least 20%, preferably at least 50%, and more preferably at least 75%, based on the yield strength of said article, with elongation to failure of said aged article being not less than about 7.0%.

3. The method of claim 1, wherein the titanium-molybdenum alloy consists essentially of 7-9 wt % of molybdenum and the balance titanium.

4. The method of claim 3, wherein the titanium-molybdenum alloy consists essentially of about 7.5 wt % of molybdenum and the balance titanium.

5. The method of claim 1, wherein the article provided is an as-cast article.

6. The method of claim 1, wherein the article provided is a hot-worked or cold-worked article.

7. The method of claim 1, wherein the article provided is a solution-treated article.

8. The method of claim 1, wherein the article provided is a hot-worked and then solution-treated article.

9. The method of claim 1, wherein the article provided is a cold-worked and then solution-treated article.

10. The method of claim 1, wherein the article provided is a solution-treated and then cold-worked article.

11. The method of claim 1, wherein the article provided is an as-cast and then cold-worked article.

12. The method of claim 1, wherein said aging is conducted at a temperature of 150-850°

C.

13. The method of claim 12, wherein said aging is conducted at a temperature of 200-800°

C.

14. The method of claim 13, wherein said aging is conducted at a temperature of 250-750°

C.

15. The method of claim 14, wherein said aging is conducted for a period of time depending on the temperature as follows:

250°

C.;

>

5 m;

preferably >

15 m;

more preferably >

30 m;

350°

C.;

>

5 m;

preferably >

10 m;

more preferably >

15 m;

400°

C.;

>

1 m;

preferably >

5 m;

more preferably >

5 m and <

960 m;

most preferably >

5 m and <

480 m;

450°

C.;

>

1m;

preferably >

3 m;

more preferably >

3 m and <

960 m;

most preferably >

3 m and <

480 m;

500°

C.;

>

30 m;

preferably >

60 m;

more preferably >

120 m;

550°

C.;

>

15 m;

preferably >

30 m;

more preferably >

60 m;

600°

C.;

>

5 m;

preferably >

15 m;

more preferably >

30 m;

650°

C.;

>

1 m;

preferably >

5 m;

more preferably >

15 m;

700°

C.;

>

1 m;

preferably >

3 m;

more preferably >

10 m;

750°

C.;

>

1 m;

preferably >

3 m;

more preferably >

5 m.