热处理对Mg-5Gd-3Y-0.5Zr合金组织和性能的影响  

Effect of heat treatment on microstructure and properties of Mg-5Gd-3Y-0.5Zr alloy

作　　者：陈雷雷[1] 李全安[1,2] 张兴渊[1,2] 陈君[1,2] 张清[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47-51,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51171059);河南省高校科技创新团队支持计划(2012IRTSTHN008);河南省基础与前沿技术研究计划项目(102300410018);国家自然科学基金(NSFC-河南人才培养联合基金;U1404501)

摘　　要：利用XRD、OM、SEM、EDS、TEM和拉伸性能测试,研究了不同热处理对Mg-5Gd-3Y-0.5Z合金组织和力学性能的影响。结果表明:Mg-5Gd-3Y-0.5Zr合金的铸态组织主要由基体相α-Mg、Mg5Gd和Mg24Y5相组成;经固溶处理后,铸态组织中粗大的析出相基本都溶入α-Mg基体;再经时效处理后,有纳米级别的颗粒状或片状相重新析出。室温条件下,Mg-5Gd-3Y-0.5Zr合金的抗拉强度在T6态达到最大值206.6 MPa。铸态和T6态合金的抗拉强度均随温度的升高,呈现出降低趋势,且下降速度较快;而T4态合金的强度在250℃以前基本保持不变。Effect of heat treatment on microstructure and mechanical properties of Mg-5Gd-3Y-0.5Zr alloy was studied by means of XRD, OM, SEM, EDS, TEM and tensile testing. The results show that the mierostructure of as-cast Mg-5Gd-3Y-0. 5Zr consists of α-Mg, Mg5Gd and Mg24Y5 phases. The coarse precipitated phases of as-cast alloy basically are dissolved into the α-Mg matrix by solid solution treatment. Then the new nano-scale precipitates is observed in the alloy after aging treatment. At room temperature, the tensile strength of Mg-5Gd-3Y-0.5Zr alloy reaches the maximum value of 206. 6 MPa at T6 state. The tensile strength of the as-cast and T6 alloy rapidly decreases with the increasing of temperature. However, the tensile strength of T4 state alloy remains about the same when the temperature is lower than 250 ℃.

关 键 词：Mg-5Gd-3Y-0.5Zr合金 显微组织 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]