气候变化领域集成服务门户(CCPortal): Grain-boundary topological phase transitions

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DOI	10.1073/PNAS.2017390117
	Grain-boundary topological phase transitions
	Chen K.; Srolovitz D.J.; Han J.
发表日期	2021
ISSN	00278424
起始页码	33077
结束页码	33083
卷号	117 期号:52
英文摘要	The formation and migration of disconnections (line defects constrained to the grain boundary [GB] plane with both dislocation and step character) control many of the kinetic and dynamical properties of GBs and the polycrystalline materials of which they are central constituents. We demonstrate that GBs undergo a finite-temperature topological phase transition of the Kosterlitz–Thouless (KT) type. This phase transition corresponds to the screening of long-range interactions between (and unbinding of) disconnections. This phase transition leads to abrupt changes in the behavior of GB migration, GB sliding, and roughening. We analyze this KT transition through mean-field theory, renormalization group theory, and kinetic Monte Carlo simulations and examine how this transition affects microstructure-scale phenomena such as grain growth stagnation, abnormal grain growth, and superplasticity. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Grain boundary; Grain growth; Materials science; Phase transition; Thermodynamics
语种	英语
scopus关键词	article; grain; materials science; Monte Carlo method; phase transition; thermodynamics
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179636
作者单位	Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104, United States; Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, Hong Kong
推荐引用方式 GB/T 7714	Chen K.,Srolovitz D.J.,Han J.. Grain-boundary topological phase transitions[J],2021,117(52).
APA	Chen K.,Srolovitz D.J.,&Han J..(2021).Grain-boundary topological phase transitions.Proceedings of the National Academy of Sciences of the United States of America,117(52).
MLA	Chen K.,et al."Grain-boundary topological phase transitions".Proceedings of the National Academy of Sciences of the United States of America 117.52(2021).