Molecular Dynamics Study on the Interactions of 1/2[110]Edge Dislocations with Voids and Ni_(3)Al Precipitates in FCC Ni  

作　　者：Wendong Cui Junfeng Nie Pandong Lin Lei He 

机构地区：[1]Institute of Nuclear and New Energy Technology,Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education,Tsinghua University,Beijing,100084,China [2]Ministry of Education,Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials,School of Materials Science and Engineering,Shandong University,Jinan,250061,China

出　　处：《Acta Mechanica Solida Sinica》2025年第1期1-13,共13页固体力学学报(英文版)

基　　金：supported by the Ministry of Industry and Information Technology of China(grant number TC220A04W-7,203);CNNC Youth Elite Scientific Research Project,the National Key R&D Plan of China(grant number 2020YFB1901600);the National Science Technology Major Project of China(grant numbers 2017ZX06902012 and 2017ZX06901024).

摘　　要：Nickel-based alloys are the primary structural materials in steam generators of high-temperature gas reactors.To understand the irradiation effect of nickel-based alloys,it is necessary to examine dislocation movement and its interaction with irradiation defects at the microscale.Hardening due to voids and Ni_(3)Al precipitates may significantly impact irradiation damage in nickel-based alloys.This paper employs the molecular dynamics method to analyze the interaction between edge dislocations and irradiation defects(void and Ni_(3)Al precipitates)in face-centered cubic nickel.The effects of temperature and defect size on the interaction are also explored.The results show that the interaction process of the edge dislocation and irradiation defects can be divided into four stages:dislocation free slip,dislocation attracted,dislocation pinned,and dislocation unpinned.Interaction modes include the formation of stair-rod dislocations and the climbing of extended dislocation bundles for voids,as well as the generation of stair-rod dislocation and dislocation shear for precipitates.Besides,the interactions of edge dislocations with voids and Ni_(3)Al precipitates are strongly influenced by temperature and defect size.

关 键 词：VOID Ni_(3)Al precipitate Nickel Edge dislocation Molecular dynamics 

分 类 号：TG146.2[一般工业技术—材料科学与工程]