期刊
SCRIPTA MATERIALIA
卷 139, 期 -, 页码 139-143出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2017.06.048
关键词
In situ HRTEM; Molecular dynamics; Twinning dislocation; Sessile step
类别
资金
- Natural Science Foundation of China [51071125, 51271147, 51201134, 51201135]
- 111 Project of China [B08040]
The real-time {10 (1) over bar1} twinning process at the crack tip of Ti is captured by carrying out the in situ tension tests in a transmission electron microscope. Both the atomic-resolution observations and the molecular dynamics simulations reveal that the {10 (1) over bar1} twinning deformation is accomplished by the twinning mode corresponding to the b(2) twinning dislocations instead of the conventional b(4) mode. The sessile steps in twin boundaries which induced by pyramidal stacking faults extending across the twin are observed acting as the nucleation sources of b2 twinning dislocations. The nucleation mechanism is verified by determining the Burgers vectors of the sessile steps. (C) 2017 Published by Elsevier Ltd on behalf of Acta Materialia Inc.
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