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Effect of grain size on α-variant selection in a ZrTiAlV alloy

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Abstract

Local crystallographic orientation characteristics of grains with different sizes in a ZrTiAlV alloy after interrupted cooling from β phase region are investigated by electron backscatter diffraction (EBSD) technique. A statistical analysis of EBSD data shows that bigger parent β grains present weaker variant selection than smaller grains. The relevant influences are studied by comparing the nucleation behavior of grain boundary α (GBα) and succedent growth stage in varisized grains. In-depth analysis indicates that the deviation between pole of GBα and common pole of adjacent parent β grains is responsible for the smaller degree of variant selection inside the bigger parent β grains. The formation of more than one GBα type at the β/β grain boundary with common pole in bigger grains results in obstructing each other for these variants during the following growth stage, while only one type of GBα nucleate at the β/β grain boundary with common pole in smaller grains and it can freely grow into the interior of the grains, leading to stronger variant selection in smaller β grains.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China

    FeiTao Li, ZhongNi Liao, BaiFeng Luan & Qing Liu

  2. Nuclear Power Institute of China, Chengdu, 610041, China

    Xi Qiu

  3. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China

    XinYu Zhang & RiPing Liu

Authors
  1. FeiTao Li
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  2. Xi Qiu
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  3. ZhongNi Liao
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  4. BaiFeng Luan
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  7. Qing Liu
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Correspondence to BaiFeng Luan.

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Li, F., Qiu, X., Liao, Z. et al. Effect of grain size on α-variant selection in a ZrTiAlV alloy. Sci. China Technol. Sci. 62, 982–988 (2019). https://doi.org/10.1007/s11431-018-9479-y

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  • DOI: https://doi.org/10.1007/s11431-018-9479-y

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