Structural transformation and energy analysis for pile-up dislocations at triple junction of grain boundary
晶界三叉处位错塞积的结构转变与能量分析作者机构：Guangxi Key Laboratory of Advanced Energy MaterialsGuangxi Key Laboratory for the Relativistic AstrophysicsSchool of Physics Science and EngineeringGuangxi UniversityNanning 530004China School of Physics and Telecommunication EngineeringYulin Normal UniversityYulin 537000China
出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)
年 卷 期：2022年第32卷第1期
页 面：45-63页
核心收录：
学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
基 金：financial supports from the National Natural Science Foundation of China(Nos.51161003,51561031) the Natural Science Foundation of Guangxi,China(No.2018GXNSFAA138150)
主 题：triple junction of grain boundary dislocation pile-up dislocation structural transformation energy model for pile-up ultrafine-grain materials
摘 要：An energy model for the structure transformation of pile-ups of grain boundary dislocations(GBD)at the triple-junction of the grain boundary of ultrafine-grain materials was *** energy of the pile-up of the GBD in the system was calculated by the energy model,the critical geometric and mechanical conditions for the structure transformation of head dislocation of the pile-up were analyzed,and the influence of the number density of the dislocations and the angle between Burgers vectors of two decomposed dislocations on the transformation mode of head dislocation was *** results show when the GBD is accumulated at triple junction,the head dislocation of the GBD is decomposed into two Burgers vectors of these dislocations unless the angle between the two vectors is less than 90°,and the increase of applied external stress can reduce the energy barrier of the dislocation *** mechanism that the ultrafine-grained metal material has both high strength and plasticity owing to the structure transformation of the pile-up of the GBD at the triple junction of the grain boundary is revealed.
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