【摘要】 本文建立了一种基于能量判据的确定动态再结晶各个阶段临界应变的方法,并基于此种方法利用Monte Carlo（MC）法进行了纯铜动态再结晶的二维模拟,定量计算了变形引起的存储能与变形之间的关系,计算出了发生动态再结晶的临界应变.模拟结果表明,采用MC法可以揭示动态再结晶的形核生长过程与应变历史之间的关系,结合本文所建立的基于能量判据的确定动态再结晶各个阶段临界应变的方法,可以预测开始发生动态再结晶的临界变形条件.更多还原

【Abstract】 Along with the work hardening and dynamic recovery, the dynamic recrystallization of pure copper at 673 K is simulated with Monte Carlo (MC) method. By investigating the evolution of the plastic strain energy and the morphology of the simulated microstructure, the physical process of the system during the continuous loading procedure is studied. When the strain is small enough, nothing happens in the system. Once the strain reaches a critical value, the dynamic recrystallization occurs by the nonuniform nucleation. As the strain increase, the nucleation mechanism transforms to uniform nucleation. After some MC steps, the plastic strain energy drops from its maximum value. Ever since then, the plastic strain energy fluctuates around a fixed value.更多还原