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- Title
Tension–Compression Asymmetry of Commercially Pure Titanium: Strain Rate Sensitivity and Microstructure Evolution.
- Authors
Tao, Jiahui; Gu, Boqin; Chen, Lili; Zhou, Jianfeng
- Abstract
The behavior of hot-rolled commercially pure titanium under tension and compression was investigated at different strain rates, specifically from 1 × 10−5 s−1 to 5 × 10−3 s−1, at room temperature. Strong tension–compression asymmetry in yielding and strain hardening and its sensitivity to the strain rate were observed. With the increase of strain rate, the asymmetry in yielding and strain hardening increased because of the different strain rate sensitivity during tension and compression. Electron backscattered diffraction analysis was conducted to capture the relation between the microstructure evolutions (including twinning and texture evolution) and the macrostructure responses. The results showed that the microstructure texture had changed and a new component produced during compression was perpendicular to the rolling direction, which was associated with the formation of 10 1 ¯ 2 extension twins. The fraction of twins activated during compression was much higher than that produced during tension. Specifically, the 10 1 ¯ 2 twinning accommodated for the compressive deformation and played a major role in compressive strain hardening, whereas the dislocation mediated the plasticity under tension. The dominant twinning activity following the Basinski hardening mechanism, and the texture evolution affected by the dislocation slip and deformation twinning were responsible for the tension–compression asymmetry in the commercially pure titanium.
- Subjects
STRAIN hardening; MICROSTRUCTURE; STRAIN rate; TITANIUM; ROLE conflict; BIOLOGICAL evolution
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2019, Vol 71, Issue 7, p2280
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-019-03466-z