Phase-field simulation of the coupled evolutions of grain and twin boundaries in nanotwinned polycrystals

doi:10.1007/s10483-018-2393-7

Applied Mathematics and Mechanics (English Edition) ›› 2018, Vol. 39 ›› Issue (12): 1789-1804.doi: https://doi.org/10.1007/s10483-018-2393-7

Phase-field simulation of the coupled evolutions of grain and twin boundaries in nanotwinned polycrystals

Yuanyuan DA, Yuyang LU, Yong NI

CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, China

收稿日期:2018-04-07 修回日期:2018-06-20 出版日期:2018-12-01 发布日期:2018-12-01
通讯作者: Yong NI E-mail:yni@ustc.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (No. 11672285), the Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDB22040502), the Collaborative Innovation Center of Suzhou Nano Science and Technology, and the Fundamental Research Funds for the Central Universities

Phase-field simulation of the coupled evolutions of grain and twin boundaries in nanotwinned polycrystals

Yuanyuan DA, Yuyang LU, Yong NI

CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, China

Received:2018-04-07 Revised:2018-06-20 Online:2018-12-01 Published:2018-12-01
Contact: Yong NI E-mail:yni@ustc.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (No. 11672285), the Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDB22040502), the Collaborative Innovation Center of Suzhou Nano Science and Technology, and the Fundamental Research Funds for the Central Universities

摘要/Abstract

摘要： Nanotwinned polycrystals exhibit an excellent strength-ductility combination due to nanoscale twins and grains. However, nanotwin-assisted grain coarsening under mechanical loading reported in recent experiments may result in strength drop based on the Hall-Petch law. In this paper, a phase-field model is developed to investigate the effect of coupled evolutions of twin and grain boundaries on nanotwin-assisted grain growth. The simulation result demonstrates that there are three pathways for coupled motions of twin and grain boundaries in a bicrystal under the applied loading, dependent on the amplitude of applied loading and misorientation of the bicrystal. It reveals that a large misorientation angle and a large applied stress promote the twinning-driven grain boundary migration. The resultant twin-assisted grain coarsening is confirmed in the simulations for the microstructural evolutions in twinned and un-twinned polycrystals under a high applied stress.

关键词: the action of magnetic fields, thrombus, viscous flow, nanotwin, grain growth, stress effect, phase-field simulation

Abstract: Nanotwinned polycrystals exhibit an excellent strength-ductility combination due to nanoscale twins and grains. However, nanotwin-assisted grain coarsening under mechanical loading reported in recent experiments may result in strength drop based on the Hall-Petch law. In this paper, a phase-field model is developed to investigate the effect of coupled evolutions of twin and grain boundaries on nanotwin-assisted grain growth. The simulation result demonstrates that there are three pathways for coupled motions of twin and grain boundaries in a bicrystal under the applied loading, dependent on the amplitude of applied loading and misorientation of the bicrystal. It reveals that a large misorientation angle and a large applied stress promote the twinning-driven grain boundary migration. The resultant twin-assisted grain coarsening is confirmed in the simulations for the microstructural evolutions in twinned and un-twinned polycrystals under a high applied stress.

Key words: the action of magnetic fields, thrombus, viscous flow, nanotwin, grain growth, stress effect, phase-field simulation

中图分类号:

74B20

Yuanyuan DA, Yuyang LU, Yong NI. Phase-field simulation of the coupled evolutions of grain and twin boundaries in nanotwinned polycrystals[J]. Applied Mathematics and Mechanics (English Edition), 2018, 39(12): 1789-1804.

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Phase-field simulation of the coupled evolutions of grain and twin boundaries in nanotwinned polycrystals

Phase-field simulation of the coupled evolutions of grain and twin boundaries in nanotwinned polycrystals

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