AZ91镁合金的热压缩行为(Ⅲ)--基于元胞自动机模拟的再结晶动力学  

Hot compression behavior of AZ91 alloy(Ⅲ)——Recrystallization kinetics based on cellular automata simulation

作　　者：刘六法[1] 丁汉林[1] 鎌土重晴 丁文江[1] 小島陽 

机构地区：[1]上海交通大学轻合金精密成型国家工程研究中心,上海200030 [2]长岡技术科学大学机械系,日本新潟940-2188

出　　处：《中国有色金属学报》2008年第2期250-253,共4页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(50505026);上海市自然科学基金资助项目(05ZR14075)

摘　　要：根据元胞自动机的模拟结果研究了AZ91合金热压缩过程中的再结晶动力学。结果表明,随着应变量增加,再结晶分数增加;随着变形温度升高,再结晶速率加快。稳态组织的平均晶粒尺寸与Zener-Hollomom参数成反比,指数为-0.05。压缩过程中,所有晶粒的平均尺寸迅速下降后缓慢减小至稳态值,原始晶粒平均尺寸呈线性减小为0,再结晶晶粒平均尺寸先增加至某一峰值后缓慢下降至稳态值。基体内同时存在的多次再结晶现象使得流变曲线呈单峰特征。The kinetics of dynamic recrystallization （DRX） during the hot compression process of AZ91 magnesium alloy was investigated based on the cellular automata simulation. The simulation results indicate that the fraction of DRX increases with strain increase and the velocity of DRX increases with process temperature increase. The relationship between the average grain size in the final microstructure and Zener-Hollomom parameter follows an inverse power law with the exponent of-0.05. During a compression process, the average size of total grains decreases rapidly in an initial stage, and then slowly to a steady value; the average size of initial grains decreases linearly to zero; the average size of recrystallized grains increases to a peak value and then decreases slowly to a steady value. Multi-cycle recrystallizaiton occurs concurrently in the matrix, resulting in a single peak on each flow curve.

关 键 词：AZ91合金 元胞自动机 动态再结晶 动力学 

分 类 号：TG146.2[一般工业技术—材料科学与工程]