Mg-11Gd-3Y-1.1Zn-0.5Zr的高温热压缩行为及热加工图  

High Temperature Thermal Compression Behavior and Processing Map of Mg-11Gd-3Y-1.1Zn-0.5Zr

作　　者：王颂博 李全安[1,2] 陈晓亚 朱利敏[1] 张帅 关海昆[1] WANG Songbo;LI Quan’an;CHEN Xiaoya;ZHU Limin;ZHANG Shuai;GUAN Haikun(School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;Collaborative Innovation Center of Nonferrous Metals,Henan Province,Luoyang 471023,China;School of Materials Science and Engineering,Xi’an University of Technology,Xi’an 740048,China)

机构地区：[1]河南科技大学材料科学与工程学院,洛阳471023 [2]有色金属共性技术河南省协同创新中心,洛阳471023 [3]西安理工大学材料科学与工程学院,西安740048

出　　处：《材料导报》2020年第18期18104-18108,共5页Materials Reports

基　　金：国家自然科学基金(51571084,51171059)。

摘　　要：采用Gleeble-1500热模拟试验机对均匀化后的Mg-11Gd-3Y-1.1Zn-0.5Zr合金进行了温度为350~500℃、应变速率为0.002~1 s-1的热压缩实验,构建了合金高温塑性变形的本构方程,建立并分析了合金的热加工图。结果表明:Mg-11Gd-3Y-1.1Zn-0.5Zr合金热变形发生了动态回复和动态再结晶,合金的流变应力随温度的升高和应变速率的降低而升高,合金热变形激活能Q=286.134 kJ/mol;合金在T=380~500℃、ε·=0.002~0.05 s-1区域能量耗散率大于30%且不发生失稳,适合热加工。The homogenized Mg-11Gd-3Y-1.1Zn-0.5Zr alloy was subjected to the hot compression experiment with the temperature of 350-500℃and the strain rate of 0.002-1 s-1 using a Gleeble-1500 thermal simulator.The constitutive equation of high temperature plastic deformation was established and analyzed.The results showed that the dynamic recover and dynamic recrystallization of Mg-11Gd-3Y-1.1Zn-0.5Zr alloy occurred,and the flow stress of the alloy increased with the increase of temperature and strain rate.The thermal deformation activation energy of the alloy was about 286.134 kJ/mol;the regional energy dissipation rate of the alloy at T=380-500℃,ε·=0.002-0.05 s-1 was greater than 30%and no instability,which indicates that the alloy is suitable for thermal processing.

关 键 词：Mg-11Gd-3Y-1.1Zn-0.5Zr合金 热压缩 本构方程 加工图 

分 类 号：TG146.2[一般工业技术—材料科学与工程]