Mg-6Sn-3Al-1Zn合金热压缩行为研究  

Hot Compression Behavior of Mg-6Sn-3Al-1Zn Alloy

作　　者：周世豪 魏福安 马鸿斌 程文杰 Zhou Shihao;Wei Fuan;Ma Hongbin;Cheng Wenjie(Qinghai Provincial Key Laboratory of New Light Alloys,Qinghai Provincial Engineering Research Center of High Performance Light Metal Alloys and Forming,Qinghai University)

机构地区：[1]青海大学青海省新型轻合金重点实验室,青海省高性能轻金属合金与成型工程研究中心

出　　处：《特种铸造及有色合金》2023年第11期1571-1575,共5页Special Casting & Nonferrous Alloys

基　　金：青海省应用基础研究资助项目(2022-ZJ-709)。

摘　　要：采用Gleeble3500热力模拟机对Mg-6Sn-3Al-1Zn合金在应变速率分别为0.001、0.01、0.1和1 s^(-1),热力模拟机的温度分别为573、623、673和723 K进行了热压缩试验研究。结果表明,Mg-6Sn-3Al-1Zn合金在热变形行为中真应力与压缩温度成反比,但真应力与应变速率成正比。构建了合金的双曲正弦本构模型,揭示了Mg-6Sn-3Al-1Zn合金热加工时的变形机制,以及变形温度、应变速率和流变应力之间的关系。采用峰值应力与应变量分别为0.1、0.3和0.5时的应力,根据动态材料模型理论得到合金的热加工图。结果表明,该合金的最佳加工温度范围和应变速率范围分别为708~723 K和0.001~0.04 s^(-1)。The hot compression behavior of Mg-6Sn-3Al-1Zn alloy were investigated by the Gleeble3500 thermal simulator at strain rates of 0.001,0.01,0.1 and 1 s^(-1),and the hot compression temperatures were 573,623,673 and 723 K,respectively.The results indicate that the true stress under hot compression is inversely proportional to the compression temperature and directly proportional to the strain rate.In addition,the hyperbolic sine constitutive model of the alloy was established,and the relationship between the working temperature,strain rate and stress of Mg-6Sn-3Al-1Zn alloy during the hot working process was identified.According to the dynamic material model theory,the thermal processing diagram of the alloy was obtained using the peak stress and the stress under the strain of 0.1,0.3 and 0.5.The thermal processing diagram reveals that the optimal processing range of the alloy is 708~723 K and 0.001~0.04 s^(-1).

关 键 词：Mg-6Sn-3Al-1Zn合金 热压缩 热加工图 本构方程 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG115.5[金属学及工艺—金属材料]