ZK60-RE变形镁合金时效硬化组织演变及耐疲劳性能研究  

Study on Microstructure Evolution and Fatigue Resistance of ZK60-RE Deformed Magnesium Alloy after Age Hardening

作　　者：吴安如[1] 付庆琳 陈娟[1] 董丽君[1] 覃波[1] WU Anru;FU Qinglin;CHEN Juan;DONG Lijun;QIN Bo(Hunan Provincial Key Laboratory of Vehicle Power and Transmission System,Hu'nan Institute of Engineering,Xiangtan 411101,China)

机构地区：[1]湖南工程学院汽车动力与传动系统湖南省重点实验室,湖南湘潭411101

出　　处：《热加工工艺》2020年第4期114-117,共4页Hot Working Technology

基　　金：国家自然科学基金项目(11572124);湖南省自然科学基金省市联合项目(2018JJ4044).

摘　　要：采用比强度较高的ZK60为研究对象,与复合添加稀土元素Nd和Y的合金作对比试验,通过硬度测试、显微组织分析和X射线衍射(XRD)分析对两组试验合金的显微组织和相演变规律进行研究。采用旋转弯曲疲劳试验方法、扫描电子显微镜(SEM)并配合能谱(EDS)分析对不同状态下两组合金疲劳断口形貌和断裂行为进行了分析。结果表明:复合添加稀土元素Nd和Y后,可显著细化铸态组织晶粒。经挤压并固溶/时效硬化处理后,析出的Mg3Y2Zn3(W相)、Mg12Nd和MgZn都能改善合金的疲劳性能。The ZK60 with high specific strength was used as the research object,and the alloy added with rare earth element Nd and Y was used as the contrast test.The microstructure and phase evolution of the two groups of alloys were studied by hardness test,microanalysis and X-ray diffraction(XRD)analysis.The fatigue fracture morphology and fracture behavior of the two groups of alloys in different states were analyzed by rotating bending fatigue test method,scanning electron microscope(SEM)and energy spectrum(EDS)analysis.The results show that,the as-cast grain can be refined by adding rare earth elements Nd and Y.After extrusion and solution/age hardening treatment,Mg3Y2Zn3(W phase),Mg12Nd and MgZn can improve the fatigue properties of the alloy.

关 键 词：ZK60镁合金 稀土元素 微观组织 疲劳性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]