期刊
MATERIALIA
卷 9, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.mtla.2020.100614
关键词
Titanium alloys; Deformation twinning; Stress-induced alpha '' martensite; {10 9 3}< 331 >(beta); omega phase
资金
- Fundamental Research Funds for the Central Universities [FRF-IC-18-003]
- National Natural Science Foundation of China [51850410518]
- National Science Foundation [DMR-1905835]
- Department of Chemical and Materials Engineering at University of Nevada, Reno
A high-strength metastable beta-titanium alloy, Ti-5Al-5Mo-5V-3Cr-0.5Fe (wt.%) was cold rolled at room temperature and characterized using scanning and transmission electron microscopy. A novel {10 9 3}< 331 >(beta) type deformation twining mode (Sigma 19a) is reported for the first time, and crystallographic analysis was carried-out to elucidate the origin of such high-index deformation twins. The initially beta-solutionized alloy contains nano-scale omega phase, which is also subsequently distributed within the twins. Additionally, a thin nano-scale omega layer forms along the twin boundaries, and two variants of alpha '' martensite phase form inside the deformation twins. The current work opens up new prospects for improving the ductility of high-strength Ti alloys by inducing the twinning and transformation induced plasticity effects.
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