材料期刊网

采用仿真和实验相结合的方法，系统研究了含有两尺寸组粒子分布的多相材料的再结晶过程。建立了可描述大粒子激发形核和小粒子钉扎作用的Monte-Carlo仿真模型。利用仿真定量研究了两种粒子各种参数对形核和再结晶晶粒长大过程的影响，表明粒子激发形核效率依赖于大粒子影响区的储存能和局部小粒子的分布状态；基体平均储存能和大粒子高应变区储存能作为驱动力和小粒子钉扎阻力的竞争，决定整体材料发生完全再结晶、部分再结晶或再结晶被完全抑制。将Al－(0.3—1.1)%Zr(质量分数)系列合金的实验结果与相同形变和粒子参数条件下的仿真结果进行了比较，再结晶组织形貌和再结晶动力学的仿真计算和实验观测符合良好。

Recrystallization in multi-phase materials containing particles with a two-class size distribution was studied with modeling and experiments. A 3D Monte-Carlo model combined with deterministic criteria was developed to describe nucleation stimulated by coarse particles and pinning effect of fine particles. The influences of various particle parameters on nucleation and growth of recrystallizing grains were quantitatively studied by simulations. The results show that the efficiency of particle stimulated nucleation depends on the stored energy in the particle-affected region and the local distribution of fine particles. The competition between the local stored energy, as the driving force for recrystallization, and the dragging force from fine particles, determines the final state of complete recrystallization, partial recrystallization or fully inhibited recrystallization in the whole material. Good agreements of morphologies and recrystallization kinetics are found in comparison between experiments and simulations for a series of Al-(0.3-1.1)%Zr (mass fraction) alloys under the same deformation and particle parameters.