Atomistic study of inverse size effect induced by interfacial plasticity in pearlitic multi-principal element alloy

作     者：Chen Yang Qiao-Sheng Xia Cun-Hong Yin Dong-Peng Hua Chen Yang;Qiao-Sheng Xia;Cun-Hong Yin;Dong-Peng Hua

作者机构：College of Mechanical EngineeringGuizhou UniversityGuiyang 550025China Key Laboratory of Advanced Manufacturing TechnologyMinistry of EducationGuizhou UniversityGuiyang 550025China State Key Laboratory of Solidification ProcessingCenter of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi'an 710072China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2024年第43卷第7期

页      面：3341-3355页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by the Natural Science Foundation of China (Nos.52361013 and 52001082) Guizhou Provincial Basic Research Program (Natural Science) (No. ZK general 137) Talent Project of Guizhou University and Natural Science Foundation of Guizhou University (No.202201) Open Foundation of Key Laboratory of Advanced Manufacturing Technology Foundation (No.GZUAMT2022KF) 

主　　题：Multi-principal element alloy Nano-laminated structure Molecular dynamics simulation Nanoindentation and nanoscratch 

摘      要：Owing to the fine nano-laminated structure,the pearlitic multi-principal element alloy(PMPEA) exhibits excellent mechanical and tribological ***,the incomplete understanding of the size effect of its lamella thickness and the unclear understanding of the plasticity-interface interaction mechanism limit further optimization of *** this study,the FeCoNi/Ni_3Ti interface-mediated plastic deformation behavior in PMPEA and the variation of mechanical and tribological properties with lamella thickness within the nanoscale range using molecular dynamics(MD) simulation were *** results indicate that the mechanical and tribological properties of the PMPEA with lamella thicknesses below 10 nm have a significant inverse size effect,i.e.,the smaller the lamella thickness,the weaker the *** is because the plastic carrier-interface interaction mechanism changes from a strengthening mechanism that hinders dislocations to a weakening mechanism that promotes dislocations with the decreases in the lamella thickness,and the weakening effect becomes more pronounced as the lamella thickness decreases and the number of interfaces *** particular,the deformation behavior of Ni_3Ti lamellae changes from crystal-like to amorphous-like with decreasing ***,in the sample with larger lamella thickness,the occurrence of hierarchical slips in the body-centered cubic(BCC) phase due to the multiprincipal elements effect can better alleviate the stress concentration caused by the dislocation accumulation at the interface,so that the phase interface exhibits outstanding load-bearing *** the dislocation pattern in BCC phase shows a firm high-density cell,which makes the substrate exhibit a stable tribological response.