AZ31/AZ61/AZ91镁合金超塑性压缩变形的本构方程  

Consititute equations of AZ31/AZ61/AZ91 magnesium alloy under superplastic compressive deformation

作　　者：田雅馨 林飞[2] 赵振 孙佳楠[1] 汤中彩 TIAN Yaxin;LIN Fei;ZHAO Zheng;SUN Jianan;TANG Zhongcai(College of Intelligent Manufacturing,Zhejiang Institute of Mechanical&Electrical Engi-neering,Hangzhou,Zhejiang 310053,China;College of Materials Science&Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China)

机构地区：[1]浙江机电职业技术学院智能制造学院,浙江杭州310053 [2]太原理工大学材料科学与工程学院,山西太原030024

出　　处：《模具工业》2023年第9期70-74,共5页Die & Mould Industry

基　　金：浙江机电职业技术学院产教融合项目(A-0271-22-011)。

摘　　要：对再结晶退火后的AZ31、AZ61、AZ91镁合金进行热压缩试验,研究该系列镁合金在变形温度423~673 K和应变速率1×10-4~1×10^(-2) s^(-1)范围的超塑性行为,分析工艺参数、显微组织和超塑性行为之间的关系。试验结果表明,在673 K和1×10^(-2) s^(-1)的初始应变速率下,该系列镁合金的应力应变曲线表现为明显的超塑性特征,其应变速率敏感指数分别为0.25、0.23、0.24,超塑性变形激活能分别为105.8、165.4、126.2 kJ/mol,接近其晶界自扩散活化能,并由此建立相应的超塑性压缩本构方程。Based on the hot compression experiments of AZ31,AZ61 and AZ91 magnesium alloys af⁃ter recrystallization annealing,the study for the superplastic compressive deformation of the seri⁃ous of magnesium alloys under the conditions of the temperature of 423~673 K and the strain rate of 1×10^(-4) to 1×10^(-2) s^(-1).It analyzed the relationship of the process parameters,microstructure and superplastic behavior.The experimental results indicated that the stress-strain curves showed ob⁃vious superplastic flow characteristic take place at the temperature of 673 K and at the initial strain rate of 1×10^(-2) s^(-1).Its strain rate sensitivity was 0.25,0.23,0.24.The superplastic flow activa⁃tion energy was 105.8,165.4,126.2 kJ/mol,respectively.The superplastic compressive constitute equations were set up.

关 键 词：AZ31/AZ61/AZ91镁合金 压缩超塑性行为 本构方程 

分 类 号：TG379[金属学及工艺—金属压力加工]