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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。
Abstract：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 microstructure of as-cast Mg-5Gd-3Y-0. 5Zr consists of α-Mg,Mg5 Gd 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 ℃.
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基本信息:
DOI：10.13289/j.issn.1009-6264.2016.02.009
中图分类号:TG146.22;TG166.4
引用信息:
[1]陈雷雷,李全安,张兴渊等.热处理对Mg-5Gd-3Y-0.5Zr合金组织和性能的影响[J],2016,37(02):47-51.DOI:10.13289/j.issn.1009-6264.2016.02.009.
基金信息:
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)