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In situ observations of detwinning and strain localization in pure titanium

机译：原位观察纯钛脱绒和应变局部化

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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 {10(1)2} extension twins with a low Schmid factor. However, the strain values inside the {10(1)2} extension twins are relatively low, regardless of their Schmid factors and the applied tensile strain level.
机译：原位扫描电子显微镜（SEM）和电子背散射衍射（EBSD）用于研究单轴张力下孪晶钛的抗绒状变形。 优化电抛光过程以在TI样品上准备SEM斑点，并对EBSD表征的最小干扰。 通过数字图像相关从SEM图像获得应变场。 实验结果表明，随着塑料应变的增加，脱绒的速度下降，纠纷变形受到施密律法的管辖。 在早期变形期间，应变局部主要发生在纠正区域。 随着变形所需的，局部化塑性应变倾向于围绕{10（1）2}延伸双胞胎迅速累积，具有低乳化因子。 然而，{10（1）2}延伸双胞胎内部的应变值相对较低，无论其肌脊状因子和施加的拉伸应变水平如何。

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  • 来源
    《Materials Science and Engineering》 |2021年第5期|141073.1-141073.7|共7页
  • 作者

    X.X. Guan; L. Lu; S.N. Luo; D. Fan;

  • 作者单位

    Key Laboratory of Advanced Technologies of Materials Ministry of Education Southwest Jiaotong University Chengdu Sichuan PR China;

    Key Laboratory of Advanced Technologies of Materials Ministry of Education Southwest Jiaotong University Chengdu Sichuan PR China;

    Key Laboratory of Advanced Technologies of Materials Ministry of Education Southwest Jiaotong University Chengdu Sichuan PR China;

    The Peac Institute of Multiscale Sciences Chengdu Sichuan PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Detwinning; Strain localization; Digital image correlation; SEM; EBSD;

    机译：纠纷;应变局部化;数字图像相关;SEM;EBSD.;

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