Mg-5Gd-3Sm-0.5Zr耐热镁合金热压缩变形行为  

Hot compression deformation behavior of Mg-5Gd-3Sm-0.5Zr heat-resistant magnesium alloy

作　　者：朱利敏[1,2] 李全安[1,2] 张清[1,2] 张兴渊[1,2] 

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

出　　处：《材料热处理学报》2016年第2期31-35,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51171059;51571084;U1404501);河南省高校科技创新团队支持计划资助(2012IRTSTHN008);河南省基础与前沿技术研究计划项目(102300410018)

摘　　要：采用铸造的方法制备了Mg-5Gd-3Sm-0.5Zr耐热镁合金,对实验材料进行固溶时效处理,在应变速率0.002~0.1 s^(-1)、变形温度350~500℃、最大变形量70%条件下,利用Gleeble-1500热模拟试验机进行热压缩变形实验,分析材料在不同变形条件下的真应力真应变曲线及组织变化。结果表明:在恒应变速率下热变形,真应力水平随温度升高而降低;在相同温度下进行压缩变形,实验合金的真应力随应变速率的增加而提高;实验合金适合热加工的温度在400℃以上;对数据进行处理,得到了实验材料的热变形激活能Q=222.433 k J/mol,本构方程为ε=1.70×1014[sinh(0.015σ)]3.77exp[-222433/(8.314T)]。Mg-5Gd-3Sm-0.5Zr alloy was fabricated by casting method. After solution and aging treatment, hot compression deformation was carried out on a hot-simulation machine Gleeble-1500 at strain rate range of 0. 002-0. 1 s-1 , temperature of 350-500 ℃ and maximum strain of 70%. The relationships between true stress and true strain and mierostructure of the tested alloy were studied. The results indicate that true stress decreases with increase of deformation temperature at the constant strain rate. The true stress increases with increasing strain rate at the same temperature. The temperature higher than 400 ℃ for hot-working deformation of the tested alloy is suggested. The hot deformation activation energy of 222. 433 kJ/mol is determined. Constitutive equation of the tested alloy ε=1.70×1014[sinh（0.015σ）]3.77exp[-222433/（8.314T）] is established.

关 键 词：耐热镁合金 变形激活能 热压缩变形 显微组织 

分 类 号：TG146.22[一般工业技术—材料科学与工程]