典型文献
Uncovering the softening mechanism and exploring the strengthening strategies in extremely fine nanograined metals:A molecular dynamics study
文献摘要：
The strength of polycrystalline metals increases with decreasing grain size,following the classical Hall-Petch relationship.However,this relationship fails when softening occurs at very small grain sizes(typi-cally less than 10 to 20 nm),which limits the development of ultrahigh-strength materials.In this work,using columnar-grained nanocrystalline Cu-Ag'samples',molecular dynamics simulations were performed to investigate the softening mechanism and explore the strengthening strategies(e.g.,formation of solid solution or grain boundary(GB)segregation)in extremely fine nanograined metals.Accordingly,the soft-ening of pure metals is induced by atomic sliding in the GB layer,rather than dislocation activities in the grain interior,although both occur during deformation.The solid solution lowers the stacking fault energy and increases the GB energy,which leads to the softening of NC metals.GB segregation stabilizes GB structures,which causes a notable improvement in strength,and this improvement can be further enhanced by optimizing the solute concentration and GB excess.This work deepens the understanding of the softening mechanism due to atomic sliding in the GB layer and the strengthening mechanism arising from tailoring the GB stability of immiscible alloys and provides insights into the design of ultrahigh-strength materials.
文献关键词：
中图分类号：
作者姓名：
H.R.Peng;Z.Y.Jian;C.X.Liu;L.K.Huang;Y.M.Ren;F.Liu
作者机构：
School of Materials and Chemical Engineering,Xi'an Technological University,Xi'an 710021,China;State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China
文献出处：
引用格式：
[1]H.R.Peng;Z.Y.Jian;C.X.Liu;L.K.Huang;Y.M.Ren;F.Liu-.Uncovering the softening mechanism and exploring the strengthening strategies in extremely fine nanograined metals:A molecular dynamics study)[J].材料科学技术（英文版）,2022(14):186-196
A类：
B类：
Uncovering,softening,mechanism,exploring,strengthening,strategies,extremely,fine,nanograined,metals,molecular,dynamics,study,polycrystalline,increases,decreasing,following,classical,Hall,Petch,relationship,However,this,fails,when,occurs,very,small,sizes,typi,cally,less,than,which,limits,development,ultrahigh,materials,In,work,using,columnar,nanocrystalline,Ag,samples,simulations,were,performed,investigate,explore,solid,solution,boundary,segregation,Accordingly,pure,induced,by,atomic,sliding,layer,rather,dislocation,activities,interior,although,both,during,deformation,lowers,stacking,fault,energy,leads,NC,stabilizes,structures,causes,notable,improvement,can,be,further,enhanced,optimizing,solute,concentration,excess,This,deepens,understanding,due,arising,from,tailoring,stability,immiscible,alloys,provides,insights,into,design
AB值：
0.562594
相似文献
机标中图分类号，由域田数据科技根据网络公开资料自动分析生成，仅供学习研究参考。
