Impact of grain boundary energy anisotropy on grain growth

IF 3.1 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Physical Review Materials Pub Date : 2024-09-19 DOI:10.1103/physrevmaterials.8.093403
S. Kiana Naghibzadeh, Zipeng Xu, David Kinderlehrer, Robert Suter, Kaushik Dayal, Gregory S. Rohrer
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Abstract

A threshold dynamics model of grain growth that accounts for the anisotropy in the grain boundary energy has been used to simulate experimentally observed grain growth of polycrystalline Ni. The simulation reproduces several aspects of the observed microstructural evolution that are not found in the results of simulations assuming isotropic properties. For example, the relative areas of the lowest-energy twin boundaries increase as the grains grow and the average grain boundary energy decreases with grain growth. This decrease in energy occurs because the population of higher-energy grain boundaries decreases while the population of lower-energy boundaries increases as the total grain boundary area decreases. This phenomenon emerges from the assumption of anisotropic grain boundary energies without modification of the energy minimizing algorithm. These findings are consistent with the observation that, in addition to the decrease in grain boundary area, additional energy is dissipated during grain growth by a decrease in the average grain boundary energy.

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晶界能量各向异性对晶粒生长的影响
一种考虑到晶界能量各向异性的晶粒生长阈值动力学模型被用来模拟实验观察到的多晶镍的晶粒生长。模拟再现了观察到的微结构演变的几个方面,而这些方面在假设各向同性的模拟结果中是找不到的。例如,能量最低的孪晶边界的相对面积随着晶粒的长大而增大,平均晶界能量随着晶粒的长大而减小。能量下降的原因是,随着晶粒边界总面积的减少,高能量晶粒边界的数量减少,而低能量边界的数量增加。这种现象产生于各向异性晶界能量假设,无需修改能量最小化算法。这些发现与以下观察结果是一致的:除了晶界面积的减小之外,在晶粒生长过程中,平均晶界能量的减小也会耗散额外的能量。
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来源期刊
Physical Review Materials
Physical Review Materials Physics and Astronomy-Physics and Astronomy (miscellaneous)
CiteScore
5.80
自引率
5.90%
发文量
611
期刊介绍: Physical Review Materials is a new broad-scope international journal for the multidisciplinary community engaged in research on materials. It is intended to fill a gap in the family of existing Physical Review journals that publish materials research. This field has grown rapidly in recent years and is increasingly being carried out in a way that transcends conventional subject boundaries. The journal was created to provide a common publication and reference source to the expanding community of physicists, materials scientists, chemists, engineers, and researchers in related disciplines that carry out high-quality original research in materials. It will share the same commitment to the high quality expected of all APS publications.
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