Al-1.1 Mn-0.3Mg-0.25RE合金的热变形行为及其加工图  

Hot Deformation Behavior and Processing Map of Al-1.1Mn-0.3Mg-0.25RE Alloy

作　　者：孟显娜[1] 钟华萍[2] 张辉[1] 李落星[1] 

机构地区：[1]湖南大学材料科学与工程学院,长沙410082 [2]江西理工大学材料与化学工程学院,赣州341000

出　　处：《机械工程材料》2011年第7期17-21,共5页Materials For Mechanical Engineering

基　　金：汽车轻量化技术国际合作研究项目(2010DFB70180)

摘　　要：在Gleeb-1500型热模拟试验机上对Al-1.1Mn-0.3Mg-0.25RE合金进行了热压缩试验,研究了变形温度为300～500℃、应变速率为0.01～10s^(-1)条件下合金的热变形行为,并在此基础上建立了本构方程,绘制了合金加工图。结果表明:合金热变形过程中的稳态流变应力可以用双曲正弦本构关系描述,热变形激活能为186.4817kJ·mol^(-1),材料常数A、α、n分别为1.076 97×10^(10)s^(-1),0.037 403,5.875 667;合金最佳的加工温度为450℃,应变速率为0.01s^(-1)。The hot compression experiment of AI-1. 1Mn-0. 3Mg-0. 25RE alloy was done on Gleeble 1500 thermo simulation test machine. The thermo deformation behavior was studied at 300-500 ℃ and the strain rate of 0. 01-10s^-1. On this basis the constitutive equations and the processing map were obtained. The results show that the steady flow stress could be described by the hyperbolic sine constitutive relation, the hot deformation activation energy was 186. 481 7 kJ ·mol^-1, and the material constants of A, a and n were 1. 076 97×10^10 s^-1 , 0. 037 403 and 5. 875 667 respectively. The optimum deformation temperature of the alloy was 450℃ and the optimum strain rate was 0. 01 s^-1.

关 键 词：含稀土铝合金 流变应力 热变形激活能 加工图 

分 类 号：TG146.21[一般工业技术—材料科学与工程]