In situ observations of detwinning and strain localization in pure titanium

被引:13
作者
Guan, X. X. [1 ]
Lu, L. [1 ]
Luo, S. N. [1 ]
Fan, D. [2 ]
机构
[1] Southwest Jiaotong Univ, Key Lab Adv Technol Mat, Minist Educ, Chengdu, Sichuan, Peoples R China
[2] Peac Inst Multiscale Sci, Chengdu, Sichuan, Peoples R China
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2021年 / 813卷
基金
中国国家自然科学基金;
关键词
Detwinning; Strain localization; Digital image correlation; SEM; EBSD; ANISOTROPIC DEFORMATION; BEHAVIOR; ALLOY; TI; MECHANISMS; NUCLEATION; TENSILE; SLIP; PLASTICITY; EVOLUTION;
D O I
10.1016/j.msea.2021.141073
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
In situ scanning electron microscope (SEM) and electron back scattering diffraction (EBSD) are used to investigate detwinning deformation of pre-twinned titanium under uniaxial tension. An electro-polishing procedure is optimized to prepare SEM speckles on the Ti samples with minimum interference with EBSD characterization. Strain fields are obtained from the SEM images via digital image correlation. The experimental results suggest that the rate of detwinning decreases with increasing plastic strain, and detwinning deformation is governed by the Schmid?s law. Strain localization mainly occurs in the detwinning regions during the early deformation. As deformation proceeds, localized plastic strain tends to accumulate rapidly around the {1012} extension twins with a low Schmid factor. However, the strain values inside the {1012} extension twins are relatively low, regardless of their Schmid factors and the applied tensile strain level.
引用
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页数:7
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