7075铝合金多向锻造过程的元胞自动机数值模拟  

Numerical simulation on cellular automata in multi-direction forging process of 7075 aluminum alloy

作　　者：黄东英 张磊[1] 刘晓红[1] Huang Dongying;Zhang Lei;Liu Xiaohong(Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials Guangxi,Guangxi University,Guangxi 530004,China)

机构地区：[1]广西大学广西有色金属及特色材料加工重点实验室,广西南宁530004

出　　处：《锻压技术》2021年第12期13-19,共7页Forging & Stamping Technology

基　　金：广西大学有色金属及特色材料加工重点试验室开放基金(2020GXYSOF14)。

摘　　要：为研究7075铝合金在强塑性变形前后组织演变的元胞自动机(CA)数值模拟的可靠性,基于热压缩的真应力-真应变曲线,建立了7075铝合金的再结晶、位错密度、流变应力和形核率模型,利用元胞自动机法模拟7075铝合金的多向锻造过程,分析模拟后合金的晶粒分布和晶粒演变,并与合金在多向锻造前后的电子背散射衍射(EBSD)试验结果进行对比分析。结果显示:模拟所得合金的平均晶粒尺寸为6.813μm,而试验所得合金的平均晶粒尺寸为6.57μm,且模拟所得锻造前后的合金晶粒尺寸和分布情况与试验结果相符。表明通过CA法模拟7075铝合金多向锻造过程的结果与其试验结果的吻合度较高,CA法对合金平均晶粒尺寸的预测和晶粒分布特征的观测具有一定的可信度。In order to research the reliability of numerical simulation on cellular automata(CA)of microstructure evolution for 7075 aluminum alloy before and after strong plastic deformation,based on the true stress-true strain curve of hot compression,models of recrystallization,dislocation density,rheological stress and nucleation rate for 7075 aluminum alloy were established,and the multi-directional forging process of 7075 aluminum alloy was simulated by CA method.Then,the grain distribution and grain evolution of the alloy after simulation were analyzed,and the experimental results of the alloy before and after multi-directional forging obtained by the electron backscatter diffraction(EBSD)were compared and analyzed.The results show that the average grain sizes of the alloy obtained by simulation and experiment are 6.813 and 6.57μm respectively,and the sizes and distribution of grain in the alloy before and after forging obtained by simulation are consistent with the experimental results,indicating that the simulation results of the multi-directional forging process for 7075 aluminum alloy by CA method are in good agreement with the experimental results.Thus,CA method has certain credibility for the prediction of average grain sizes and the observation of grain distribution characterization for the alloy.

关 键 词：元胞自动机 7075铝合金 多向锻造 平均晶粒尺寸 晶粒分布 

分 类 号：TG319[金属学及工艺—金属压力加工]