期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2018.09.091
关键词
Titanium; Twinning; Grain refinement; Cryogenic deformation; Electron backscatter diffraction
类别
资金
- Civil-Military Technology Cooperation Program - Ministry of Trade, Industry and Energy, Republic of Korea [16-CM-MA-10]
We compared deformation twinning activity and twin structure development of pure Ti at cryogenic temperature and room temperature by conducting unidirectional rolling at 77 K and 293 K. Twinning activity was significantly higher in rolling at 77 K than in rolling at 293 K. This was because lowering the deformation temperature increased the necessity for twinning operation to compensate for reduced accommodation of strain along the c-axis of the crystal structure, caused by inhibition of < c + alpha > slips. Twin structure was also entirely different between the two rolling temperatures. Compared to the case of rolling at 293 K, rolling at 77 K generated thin and numerous individual twins in the twinned grains, thereby giving rise to the development of a totally different twin structure. The differences in twin structure were caused by the combined effect of significant local stress concentration at grain boundaries and a reduction in stacking fault energy by rolling at 77 K. The twin structure strongly contributed to severe twinning-induced grain refinement that occurs at cryogenic temperature.
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