EXTENDED CORE STRUCTURE OF DISSOCIATED EDGE DISLOCATIONS IN FCC CRYSTALS WITH CONSIDERATION OF DISCRETENESS  

作　　者：Xiaozhi Wu Shaofeng Wang Huili Zhang 

机构地区：[1]Institute for Structure and Function, Chongqing University, Chongqing 400044, China

出　　处：《Acta Mechanica Solida Sinica》2008年第5期403-410,共8页固体力学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.10774196);the Science Founda-tion Project of CQ CSTC (No.2006BB4156);Chongqing University Postgraduates’Science and Innovation Fund(No.200707A1A0030240)

摘　　要：The extended core structure of the dissociated edge dislocation in Al, Au, Ag, Cu and Ni is determined within lattice theory of dislocation. The 2D dislocation equation governing the displacements is coupled by the restoring forces that are determined by the parameterization of the generalized stacking fault energies. The Ritz variational method is presented to solve the dislocation equation and the trial solution is constituted by two arctan-type functions with two undetermined parameters. The core widths of partial dislocations are wider than that obtained in generalized Peierls-Nabarro model due to the consideration of discreteness of crystal.The extended core structure of the dissociated edge dislocation in Al, Au, Ag, Cu and Ni is determined within lattice theory of dislocation. The 2D dislocation equation governing the displacements is coupled by the restoring forces that are determined by the parameterization of the generalized stacking fault energies. The Ritz variational method is presented to solve the dislocation equation and the trial solution is constituted by two arctan-type functions with two undetermined parameters. The core widths of partial dislocations are wider than that obtained in generalized Peierls-Nabarro model due to the consideration of discreteness of crystal.

关 键 词：core structure DISSOCIATION dislocation equation variational method 

分 类 号：O3[理学—力学]