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运用分子动力学方法,研究了金属铜单晶中不同形状的Frank位错环演化形成的各种类层错四面体稳定构型.对其形成过程的细致分析表明,这些稳定构型都可以用统一的位错分解和位错反应过程来解释.模拟结果表明,在零温下各种Frank位错环存在各自的临界尺寸,小于临界尺寸的Frank位错环不能长成类层错四面体结构.对梯形、六边形等Frank位错环演化过程的模拟表明,在形成稳定类层错四面体的过程中,存在位错生长和回缩的振荡现象.振荡现象是由于位错间的排斥和吸引相互作用不同步或弹性波传播的延迟效应引起的.
Using molecular dynamics method, the stability of various kinds of stacking fault tetrahedrons formed by the evolution of different shapes of Frank dislocation loops in metallic copper single crystal has been studied. The detailed analysis of the formation process shows that these stable configurations can be used Unified dislocation decomposition and dislocation reaction process to explain the simulation results show that the various Frank dislocation loops at zero temperature exist their respective critical size, less than the critical size of the Frank dislocation loop can not grow into a fault-type tetrahedron-like structure Simulations of the evolution of Frank dislocation loops, such as trapezoid and hexagon, show that there are oscillations of dislocation growth and retraction during the formation of stable class-stacking tetrahedra, which is due to the exclusion of dislocations And the attraction of the interaction is not synchronized or delayed propagation of elastic waves caused.