Effect of interaction of dislocations with core-shell nanowires on critical shear stress of nanocomposites  

作　　者：方棋洪 刘咏 李慧中 黄伯云 

机构地区：[1]State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University [2]State Key Laboratory of Powder Metallurgy, Central South University

出　　处：《Journal of Central South University》2010年第3期437-442,共6页中南大学学报（英文版）

基　　金：Projects(50801025, 50634060 ) supported by the National Natural Science Foundation of China

摘　　要：The contribution to the critical shear stress of nanocomposites caused by the interaction between screw dislocations and core-shell nanowires (coated nanowires) with interface stresses was derived by means of the MOTT and NABARRO's model. The influence of interface stresses on the critical shear stress was examined. The result indicates that, if the volume fraction of the core-shell nanowires keeps a constant, an optimal critical shear stress may be obtained when the radius of the nanowire with interface stresses reaches a critical value, which differs from the classical solution without considering the interface stresses under the same external conditions. In addition, the material may be strengthened by the soft nanowires when the interface stresses are considered. There also exist critical values of the elastic modulus and the thickness of surface coating to alter the strengthening effect produced by it.The contribution to the critical shear stress of nanocomposites caused by the interaction between screw dislocations and core-shell nanowires （coated nanowires） with interface stresses was derived by means of the MOTT and NABARRO＇s model. The influence of interface stresses on the critical shear stress was examined. The result indicates that, if the volume fraction of the core-shell nanowires keeps a constant, an optimal critical shear stress may be obtained when the radius of the nanowire with interface stresses reaches a critical value, which differs from the classical solution without considering the interface stresses under the same external conditions. In addition, the material may be strengthened by the soft nanowires when the interface stresses are considered. There also exist critical values of the elastic modulus and the thickness of surface coating to alter the strengthening effect produced by it.

关 键 词：NANOCOMPOSITES dislocations NANOWIRE interface stress critical shear stress 

分 类 号：TF769[冶金工程—钢铁冶金]