辐照缺陷装饰位错是否会导致硬化?  

Does the decoration of irradiation defects induce hardening?

作　　者：崔嵬 刘伟 崔一南 Wei Cui;Wei Liu;Yinan Cui(Navigation and Control Technology Research Institute of China North Industries Group Corporation Limited,Beijing,100089,China;School of Materials Science and Engineering,Tsinghua University,Beijing,100084,China;Applied Mechanics Lab.,School of Aerospace Engineering,Tsinghua University,Beijing,100084,China)

机构地区：[1]Navigation and Control Technology Research Institute of China North Industries Group Corporation Limited,Beijing,100089,China [2]School of Materials Science and Engineering,Tsinghua University,Beijing,100084,China [3]Applied Mechanics Lab.,School of Aerospace Engineering,Tsinghua University,Beijing,100084,China

出　　处：《Acta Mechanica Sinica》2024年第2期259-267,共9页力学学报（英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.12172194,12222205,and 51971115);the National Key Research and Development Program of China(Grant No.2019YFE03130003).

摘　　要：纳米尺寸的辐照缺陷常常会在位错线附近聚集,形成装饰效应.研究者通常采用级联诱导源硬化模型描述装饰效应引起的辐照硬化.本研究工作发现不可动辐照缺陷装饰位错会导致辐照硬化,硬化程度与理论模型预测一致.然而,当装饰辐照缺陷可动时,则不发生辐照硬化,甚至发生软化,这种硬化消失是由于位错环始终处于与位错线相互作用力近似为零的区域,并与位错线发生关联运动.该工作带来了对辐照缺陷装饰效应和辐照硬化的新理解.Nano-sized irradiation defects are widely observed to aggregate and decorate the dislocation lines,which is believed to induce irradiation hardening and is mainly described by the cascade-induced source hardening model.In the current work,we demonstrate that dislocation decorated by sessile irradiation defects leads to hardening,which agrees well with the theoretical model prediction.However,no hardening or even softening is observed if the decorated irradiation defects are glissile.The reason for this observation is that the glissile irradiation loops move coordinated to the moving dislocation,and keep in the region where the interaction force between the irradiation defects and dislocation is zero.This work leads to a new understanding of irradiation defect decoration effect and irradiation hardening.

关 键 词：相互作用力 辐照硬化 辐照缺陷 装饰效应 硬化模型 位错环 纳米尺寸 模型预测 

分 类 号：O3[理学—力学]