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<p>Most of damage events are attributed to crack initiation induced by the dislocation accumulation at phase boundaries (PBs) in dual-phase titanium alloys, but the slip transferability across PBs that depends on the deviation of the <i>α</i>/<i>β</i> phases from the classic Burgers orientation relationship (BOR) still remains unclear. In this work, we investigated the interaction of dislocations with PBs in a dual-phase Ti–Al–Mo–Cr–Fe alloy. The Burgers misorientation angle (BMA) is introduced to describe the deviation of the two phases from the BOR (non-BOR). The experimental results show that prismatic &lt; <Emphasis Type="BoldItalic">a</Emphasis> &gt; in <i>α</i> phase favorably transmits into {110} &lt; 111 &gt; dislocations in <i>β</i> at PBs with high BMAs, i.e., <i>P</i><sub><i>α</i></sub> → {110}<sub><i>β</i></sub>. However, the <i>P</i><sub><i>α</i></sub> → {112}<sub><i>β</i></sub> and basal &lt; <Emphasis Type="BoldItalic">a</Emphasis> &gt; <sub><i>α</i></sub> → {110}<sub><i>β</i></sub> mainly concentrated at PBs with low BMAs. The general effect of the BMAs on slip transferability across PBs is explored. Furthermore, the best misorientation angle/axis pair of the BMAs preferable for slip transmission is proposed.</p>

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The effect of deviation from the Burgers orientation relationship on slip transferability across α/β interfaces in a dual-phase titanium alloy

  • 期刊论文

  • 发表日期：

    2025年7月3日

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  • Yuhang Gao,
  • Shun Xu,
  • Jiayao Ying,
  • Suyuan Yang,
  • Yanan Sun,
  • Shiwei Pan,
  • Zijian Wang,
  • Fei Zhang,
  • Gan Li,
  • Qunbo Fan,
  • Xingwang Cheng

摘要

Most of damage events are attributed to crack initiation induced by the dislocation accumulation at phase boundaries (PBs) in dual-phase titanium alloys, but the slip transferability across PBs that depends on the deviation of the α/β phases from the classic Burgers orientation relationship (BOR) still remains unclear. In this work, we investigated the interaction of dislocations with PBs in a dual-phase Ti–Al–Mo–Cr–Fe alloy. The Burgers misorientation angle (BMA) is introduced to describe the deviation of the two phases from the BOR (non-BOR). The experimental results show that prismatic < a > in α phase favorably transmits into {110} < 111 > dislocations in β at PBs with high BMAs, i.e., Pα → {110}β. However, the Pα → {112}β and basal < a > α → {110}β mainly concentrated at PBs with low BMAs. The general effect of the BMAs on slip transferability across PBs is explored. Furthermore, the best misorientation angle/axis pair of the BMAs preferable for slip transmission is proposed.