断开连接的流程介导的谷物旋转
Caihao Qiu1, Marco Salvalaglio2,3, David J Srolovitz4
1Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong Special Administrative Region, China.
概括
聚晶材料中的粒度旋转是由断路驱动的,这些断路是线路缺陷. 本研究引入了一个模型,展示了断电流如何影响谷物方向和接口演变.
科学领域:
- 材料科学 材料科学 材料科学
- 晶体学 晶体学是指结晶学.
- 连续力学 连续力学
背景情况:
- 颗粒旋转是多晶材料 (如金属和陶) 中常见的现象.
- 接口迁移被理解为由断开连接 (线路缺陷) 的移动驱动.
研究的目的:
- 提出一个连续模型,尊重晶体学对粒边界和接口.
- 调查谷物旋转和微观结构演变中断路的作用.
主要方法:
- 为曲面接口开发一个结晶学尊重的连续模型.
- 数字模拟分析断开流对粒度方向和接口形态学的影响.
- 模型预测与分子动力学模拟的比较.
主要成果:
- 断开连接的流动被证明改变了颗粒的方向和接口形态.
- 发现内部应力场与断开连接的流动有关.
- 模型预测与毛细管驱动的谷物边界演变的分子动力学结果保持一致.
结论:
- 拟议的连续模型有效地捕捉了谷物旋转中断路的作用.
- 该模型为理解由接口迁移驱动的微结构演变提供了一个框架.
- 这项工作提供了对多晶材料行为的基本机制的见解.
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