边界条件对离散位错动力学模拟疲劳Cu单晶位错花样的影响  

EFFECTS OF BOUNDARY CONDITIONS ON DISLOCA-TION PATTERNS IN FATIGUED COPPER SINGLE CRYSTAL SIMULATED BY DISCRETE DISLOCATION DYNAMICS

作　　者：杨继红[1] 李守新[2] 柯伟[2] 

机构地区：[1]沈阳师范大学物理系,沈阳110034 [2]中国科学院金属研究所沈阳材料科学国家(联合)实验室,沈阳110016

出　　处：《金属学报》2003年第7期704-710,共7页Acta Metallurgica Sinica

基　　金：国家自然科学基金50271075;国家重点基础研究发展规划G19990650;中国博士后基金

摘　　要：利用二维离散位错动力学方法,研究了边界条件对计算机模拟疲劳Cu单晶位错花样的影响,结果表明:边界条件在模拟位错花样这类多体问题时是非常重要的;在其它模拟机制均完全相同的情况下,不同边界条件会形成不同的模拟结果,自由空间边界条件是最简单、也是最不现实的边界条件,模拟结果与实验结果相差甚远;而一维最近邻周期性边界条件与二维近邻周期性边界条件的模拟结果基本相同,与Cu单晶早期疲劳位错花样的实验比较吻合。The effect of boundary conditions on computer simulating dislocation patterns of a fatigued copper single crystals was studied by using the method of discrete dislocation dynamics in two-dimensional system. The results show that the boundary condition is very important to study the phenomenon of dislocation self-organization. The free-space boundary condition cannot yield a reasonable results, however, the one-dimensional and two-dimensional periodic boundary conditions could yield better results which are similar to the experimental observation of dislocation walls in early stage of fatigued copper single crystal.

关 键 词：离散位错动力学 边界条件 位错花样  Cu单晶 

分 类 号：TG146.11[一般工业技术—材料科学与工程] TG113.255[金属学及工艺—金属材料]