Stress-driven grain re-orientation and merging behaviour found in oxidation of zirconium alloy using in-situ method and MD simulation

Stress-driven grain re-orientation and merging behaviour found in oxidation of zirconium alloy using in-situ method and MD simulation
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使用原位方法和 MD 模拟发现锆合金氧化中应力驱动的晶粒重新取向和合并行为

DOI:
10.1016/j.corsci.2018.11.034
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发表时间:
2019-02
期刊:
影响因子:
8.3
通讯作者:
He W
He W
中科院分区:
材料科学1区
文献类型:
--
作者:
Wang Z;Zhou B X;Pan R J;Cao X X;Wu L;Zhu W;Wen B;Fang Z Q;Ovcharenko Y M;He W

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人们一直认为,有助于减少氧化层中氧扩散的ZrO2柱状晶粒是小晶粒生长的结果,后续锆合金的氧化机理也是在此基础上形成和发展的。在这里,我们报告了在 500℃ 空气条件下进行的原位氧化实验,证明大尺寸 ZrO2 晶粒是小尺寸晶粒合并的结果,而不是小晶粒生长的结果。我们进一步表明,原始取向和位错运动在小尺寸晶粒的合并过程中起着至关重要的作用。
It has been believed that ZrO2columnar grains, which contribute to the reduction of oxygen diffusion in the oxide layer, are the result of growth of small grains, and the subsequent oxidation mechanism of zirconium alloy is also formed and developed on this basis. Here we report anin situoxidation experiment carried out at 500 ℃ air condition demonstrating that large size ZrO2grains was results of the merging of small size grains rather than growth of small grains. We further show that original orientation and dislocation motion play crucial roles in the merging process of small size grains.
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