期刊
MATERIALS LETTERS
卷 185, 期 -, 页码 488-490出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2016.09.077
关键词
Metals and alloys; Microstructure; Nanocrystalline; Hexagonal close-packed; High-resolution electron microscopy
资金
- National Natural Science Foundation of China [51475375]
- State Key Laboratory of Solidification Processing in NWPU [KP201305]
The deformation mechanisms of alpha titanium with the hexagonal close-packed structure in Ti-6Al-4V subjected to severe plastic deformation were investigated. The fine-structure characteristics of alpha titanium with different nanocrystalline sizes were observed and analyzed via high-resolution transmission electron microscopy. The experimental results suggested that dislocation slip was the dominant deformation mechanism and the pyramidal < c+a >-type dislocation slip was liberally activated as the nanocrystalline size was larger than 15 nm. Meanwhile, twinning on {1 (1) over bar 01} plane contributed much less to the deformation. As the nanocrystalline size decreased to be smaller than 15 nm, grain boundary sliding would accommodate the deformation.
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