Modeling on dynamic recrystallization of aluminium alloy 7050 during hot compression based on cellular automaton  

作　　者：李军超 谢志远 李松蒲 臧艳艳 

机构地区：[1]College of Material Science and Engineering, Chongqing University

出　　处：《Journal of Central South University》2016年第3期497-507,共11页中南大学学报（英文版）

基　　金：Project(2012ZX04010-8)supported by National Key Technology R&D Program of China

摘　　要：The dynamic recrystallization(DRX) process of hot compressed aluminium alloy 7050 was predicted using cellular automaton(CA) combined with topology deformation. The hot deformatation characteristics of aluminium alloy 7050 were investigated by hot uniaxial compression tests in order to obtain the material parameters used in the CA model. The influences of process parameters(strain, strain rate and temperature) on the fraction of DRX and the average recrystallization grain(R-grain) size were investigated and discussed. It is found that larger stain, higher temperature and lower strain rate(less than 0.1 s^(–1)) are beneficial to the increasing fraction of DRX. And the deformation temperature affects the mean R-grain size much more greatly than other parameters. It is also noted that there is a critical strain for the occurrence of DRX which is related to strain rate and temperature. In addition, it is shown that the CA model with topology deformation is able to simulate the microstructural evolution and the flow behavior of aluminium alloy 7050 material under various deformation conditions.The dynamic recrystallization（DRX） process of hot compressed aluminium alloy 7050 was predicted using cellular automaton（CA） combined with topology deformation. The hot deformatation characteristics of aluminium alloy 7050 were investigated by hot uniaxial compression tests in order to obtain the material parameters used in the CA model. The influences of process parameters（strain, strain rate and temperature） on the fraction of DRX and the average recrystallization grain（R-grain） size were investigated and discussed. It is found that larger stain, higher temperature and lower strain rate（less than 0.1 s^–1） are beneficial to the increasing fraction of DRX. And the deformation temperature affects the mean R-grain size much more greatly than other parameters. It is also noted that there is a critical strain for the occurrence of DRX which is related to strain rate and temperature. In addition, it is shown that the CA model with topology deformation is able to simulate the microstructural evolution and the flow behavior of aluminium alloy 7050 material under various deformation conditions.

关 键 词：cellular automaton dynamic recrystallization aluminium alloy 7050 flow stress 

分 类 号：TG146.21[一般工业技术—材料科学与工程]