第二相粒子尺寸对基体晶粒长大影响的仿真研究

根据第二相粒子与基体晶界交互作用的微观物理基础，建立了复相材料晶粒长大的三维图象的仿真方法，设计了含有相同体积分数，不同尺寸第二相粒子的复相体系，并全程仿真了三维复相材料的晶粒长大过程，对粒子尺寸影响基体粒长大的直接观察和定量分析表明，粒子尺寸越大，晶界的“脱钉”趋势越弱，晶粒长大到达停滞状态所经历的时间越长，停滞状态下基体晶粒尺寸越大且尺寸分布的均匀性越近，极限晶粒尺寸与粒子尺寸之间并不存在简单

COMPUTER SIMULATION OF THE INFLUENCE OF THE SECOND-PHASE PARTICLE SIZE ON GRAIN GROWTH

A three-dimensional image simulation method for grain growth ill double-phased materials was setup, based on micro physical analysis of interaction between the second-phase particle and thegrain boundary. Double-phased systems containing the second-phase particles of same quantity with various sizes were designed, and the complete process of grain growth was simulated. Direct observation andquantitative analysis of the simulated grain growth in double-phased material showed that, the largerthe particle size is, the weaker is the "unpinning" tendency of the grain boundary; the longer the timestopping grain growth is the larger is the average grain size and the more inhomogeneous is the grain sizedistribution; there is no simple linear relation between the critical grain size and the particle size, and theinfluences of the perse degree of particles should be taken into consideration.