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首页> 外文学位 >Twin nucleation, twin propagation, twin-slip interactions, pseudo-elasticity, strain-rate sensitivity and non-Schmid's effects of {101¯2} twinning in magnesium via in-situ EBSD.
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Twin nucleation, twin propagation, twin-slip interactions, pseudo-elasticity, strain-rate sensitivity and non-Schmid's effects of {101¯2} twinning in magnesium via in-situ EBSD.

机译：通过原位EBSD在镁中{101 2}孪晶的孪生成核，孪生传播，孪生滑动相互作用，拟弹性，应变速率敏感性和非Schmid效应。

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摘要

In-situ EBSD on profuse {101¯2} twinning in magnesium revealed that the twinning stress for nucleation is not totally rate-insensitive but highly dependent on grain boundary misorientation ranging between 10° and 15°. A new regime in the theta-strain curve; Regime-D, before Regime II, was identified for axisymmetric textures and corresponded to mitigation of twin propagation which was markedly rate-sensitive, such when the strain-rate fell below 10-5/s, twin propagation, but not twin nucleation, was completely halted and this fact substantiates the predominant effect of transmutation on Regime II hardening over that of Hall and Petch by twin segmentation. This technique revealed that twin nucleation dominates twin growth rate over twin propagation in grains undergoing multi-variant twinning under high-Schmid factors. Pseudo-elasticity in Mg was revealed to originate from an unusual detwinning phenomenon of residual twins. This effect was attributed to incomplete accommodation slip necessary for the shape change by twin to take place.;Keywords: In-situ EBSD, Non-Schmid's effects, grain misorientation, strain-rate dependence, twin nucleation, twin propagation, pseudo-elasticity, twin-twin hardening.
机译：大量{101’2}孪晶在镁中的原位EBSD表明，成核的孪晶应力并非完全对速率不敏感，而是高度依赖于10°和15°之间的晶界失取向。 θ-应变曲线的新机制； Regime-D在Regime II之前被确定为轴对称织构，并且对应于孪生传播的缓解，这对速率敏感，对速率敏感，例如，当应变速率降至10-5 / s以下时，孪生传播而不是孪生成核。完全停止运行，这一事实证实了twin变对Regime II硬化的主要影响，超过了通过双分割进行的Hall和Petch硬化的影响。这项技术表明，在高施密特因子作用下经历多变量孪晶的晶粒中，孪晶成核作用占孪生生长速率的主导。镁中的伪弹性被发现是由残余双胞胎的异常解缠现象引起的。关键词：原位EBSD，非施密特效应，晶粒取向不良，应变率依赖性，孪晶形核，孪晶扩展，拟弹性，双胞胎硬化。

著录项

  • 作者

    Kapil, Janit.;

  • 作者单位

    Mississippi State University.;

  • 授予单位 Mississippi State University.;
  • 学科 Engineering Mechanical.
  • 学位 M.S.
  • 年度 2011
  • 页码 71 p.
  • 总页数 71
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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