中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 36 No. 1 January 2026 |
（a School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China;
b National Key Laboratory of Science and Technology on Materials Under Shock and Impact, Beijing 100081, China;
c State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China;
d Chongqing Innovation Center, Beijing Institute of Technology, Chongqing 401135, China）
Abstract:In order to overcome the embrittlement of metastable titanium alloys caused by the precipitation of ωiso phase during aging, regulation of isothermal ω precipitation was investigated in Ti-15Mo alloy. The results show that the sample is brittle when direct aging (A) is applied at 350 °C for 1 h after solution treatment (ST). If pre-deformation (D) is performed on the ST sample to induce {332} twins and secondary α′′ phase, subsequent aging at 350 °C (STDA350) improves the strength to 931 MPa with a good ductility of about 20% maintained. However, when aging is performed at 400 °C or 450 °C (STDA400/450), the strength can be further improved, but the ductility is dramatically reduced. Atomic-scale characterizations show that the partial collapse of ω phase in the STDA350 sample effectively eliminates aging-induced embrittlement, but complete collapse leads to poor ductility in the STDA400/450 sample.
Key words: room-temperature mechanical property; structural collapse; ω phase; aging-induced embrittlement; Ti-15Mo alloy
