AZ40M镁合金的Fields-Backofen模型及加工图  

Fields-Backofen Model and Processing Map of AZ40M Alloy

作　　者：刘克威[1] 谭安平[1] Liu Kewei;Tan Anping(Engineering Training Center,Engineering and Technical College,Chengdu University of Technology)

机构地区：[1]成都理工大学工程技术学院工程训练中心,四川乐山614000

出　　处：《特种铸造及有色合金》2020年第2期143-147,共5页Special Casting & Nonferrous Alloys

基　　金：成都理工大学工程技术学院基金资助项目(C122017031)。

摘　　要：通过热压缩模拟试验,研究了AZ40M镁合金在塑性成形过程中,流动应力随应变速率、变形温度及应变的变化。基于试验的真应力-真应变数据,建立了Fields-Backofen模型,通过优化改进,提出了一种新的模型,并绘制了AZ40M镁合金的加工图。结果表明,在峰值应力前AZ40M镁合金的Fields-Backofen模型预测曲线与试验数据比较符合;改进后的新模型,具有较高的精度,相关系数达到了0.9918,平均相对误差为3.84%,在整个变形阶段的预测曲线与试验数据更加一致。通过加工图分析表明,在变形温度为620~673K,应变速率为0.005~0.05s^-1时适宜该合金的热加工。The relationship between flow stress and strain rate,deformation temperature and strain was investigated during the plastic forming process of AZ40 Malloy through hot-compressive simulation testing.The FieldsBackofen model was established by experimentally obtained true stress-true strain data,and the optimization and improvement were carried out to put forward a new model.Meanwhile,the processing map of AZ40 Malloy was drawn.The results reveal that the Fields-Backofen model prediction curve of AZ40 Malloy is well in agreement with the experimental data before peak stress.The modified new model has a higher precision,where the correlation coefficient reaches 0.9918 and the average relative error is 3.84%,and the prediction curve of the whole deformation stage is in better agreement with the experimental data.The processing map analysis shows that the hot working of the alloy is more suitable in the range of deformation temperature of 620~673 Kand strain rate o f0.005~0.05 s^-1.

关 键 词：AZ40M镁合金 热压缩 流动应力 Fields-Backofen模型 加工图 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TP311[金属学及工艺—金属材料]