Gd对ZL205A合金显微组织和力学性能的影响  

Effect of Gd on Microstructures and Mechanical Properties of ZL205A Alloys

作　　者：李作为[1] 刘晓滕[1] 郝海[1] 张兴国[1] 

机构地区：[1]大连理工大学材料科学与工程学院,辽宁大连116024

出　　处：《铸造》2013年第6期549-553,共5页Foundry

基　　金：中央高校基本科研业务费专项资金资助项目(DUT11ZD115);辽宁省百千万人才支持计划项目(2011921065)

摘　　要：研究了不同质量分数Gd对ZL205A合金铸态及T6态显微组织和力学性能的影响。采用光学显微镜、荧光光谱仪和电子探针对制备的试样微观组织和元素分布进行分析,并利用电子拉伸试验机对铸锭的力学性能进行测试。结果表明:微量稀土元素Gd能细化ZL205A合金的晶粒,并与合金中的其他元素形成新相,能提高合金铸态和T6后的力学性能;当Gd加入量为0.06%时,综合力学性能最优,铸态时抗拉强度为192 MPa,伸长率为11.1%;T6态时抗拉强度达到421.1 MPa,伸长率为10.2%。但当Gd添加量过多时,合金的组织与性能均产生恶化。The microstructures and mechanical properties of ZL205A alloy with different mass fraction Gd addition on as-cast and T6 state were studied in this paper. The microstructures and elements distribution of the samples were analysed by optical microscope, fluorescence spectrometer and EPMA. Then the mechanical properties of the specimens were tested by using the electronic tensile testing machine. The results showed that the trace rare earth element Gd could refine the grain of ZL205A alloy, and form some new phases with the other elements in the alloy; it also could increase the mechanical properties of the as-cast alloys and the ones with T6 heat treatment. When the Gd addition was 0.06% mass fraction, the comprehensive mechanical properties were best, the tensile strength on as-cast state was 192 MPa, the elongation was 11.1%. On T6 state the tensile strength reached 421.1 MPa, and the elongation was 10.2%. However when the amount of Gd was too much, both the microstructures and the properties of the alloys deteriorated.

关 键 词：稀土Gd ZL205A铝合金 显微组织 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]