摘要
The microstructure evolution and mechanical property of Ti-22Al-25Nb (at%) alloy by different phase region isothermal forging and heat treatment were studied. The results indicate that as the isothermally forging temperature increases from 980℃ (α2+O+B2 three phase region) to 1040℃ (α2+B2 two phase region) to 1060℃ (B2 phase region), the microstructures of alloys are equiaxed microstructure, duplex microstructure, and bimodal size lamellar O microstructure. The size and volume fraction of each phase can be controlled by heat-treatment schedule. The mechanical properties of alloys show that bimodal size lamellar O microstructure has the highest strength but the worst ductility; however, the equiaxed microstructure has the highest ductility but the lowest strength. The equiaxed microstructure has the worst creep resistance, while the duplex microstructure and the bimodal size lamellar O microstructure have similar creep resistance, because they are both mainly lamellar structure, which possess better creep resistance than the equiaxed microstructure.
| 源语言 | 英语 |
|---|---|
| 页（从-至） | 1605-1608 |
| 页数 | 4 |
| 期刊 | Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering |
| 卷 | 45 |
| 期 | 6 |
| 出版状态 | 已出版 - 1 6月 2016 |