Abstract
The work aims to reveal relationship between solution temperature, microstructure, and mechanical properties of Ti–5Al5Mo5V3Cr1Zr (Ti-55 531) alloy. The alloys are prepared via solution processing in a temperature ranging from T β − 100 °C (where T β is β-transus temperature) to T β + 100 °C for 2 h; and then air cooled, aged at 600 °C for 6 h, and air cooled again. Results indicate that solution temperature range (from T β − 100 °C to T β + 100 °C) can be divided into following five ranges according to performance of Ti-55 531 alloy. The alloy presents excellent mechanical performance combining high strength and good ductility for solution temperatures ranging from T β − 50 °C to T β − 30 °C and from T β + 10 °C to T β + 30 °C. Interestingly, the Ti-55 531 alloy exhibits a dramatically enhanced strength, while ductility drops rapidly as solution temperature exceeds T β + 70 °C. The enhanced strength's main reason is that grain boundary α phase changes from continuous to discontinuous with increasing solution temperature; nevertheless, the increased size of β grains results in a reduction in ductility. Thus, continuity of grain boundary α phase has a dramatical influence on performance of Ti-55 531 alloy.
| Original language | English |
|---|---|
| Article number | 2200003 |
| Journal | Advanced Engineering Materials |
| Volume | 25 |
| Issue number | 5 |
| DOIs | |
| State | Published - Mar 2023 |
Keywords
- mechanical properties
- microstructures
- solution treatments
- Ti-55531 alloy