稀土元素Y对挤压态Mg-Zn-Y-Zr合金的微观组织及力学性能的影响  

Influences of Rare Earth Element Y on Microstructure and Mechanical Properties of Hot-extruded Mg-Zn-Y-Zr Magnesium Alloys

作　　者：马立民 王海轩 张立新[1,3] 陈文振[1] MA Li-min;WANG Hai-xuan;ZHANG Li-xin;CHEN Wen-zhen(Harbin institute of Technology at Weihai, Weihai 264209, China;Taiyuan University of Science and Technology, Taiyuan, 030024, China;Naval Aeronautical Engineering Institute, Yantai 264001, China)

机构地区：[1]哈尔滨工业大学(威海),山东威海264209 [2]太原科技大学,太原030024 [3]海军航空工程学院,山东烟台264001

出　　处：《精密成形工程》2018年第2期7-12,共6页Journal of Netshape Forming Engineering

基　　金：国家自然科学基金(51401064);山东省科技发展计划(2014GGX10211);山东省科技重大专项(2015ZDJQ02002)

摘　　要：目的研究Y含量对Mg-Zn-Y-Zr镁合金棒料的显微组织和力学性能的影响规律,为镁合金成分设计提供参考。方法通过对7种Y含量不同的Mg-Zn-Y-Zr镁合金挤压棒料的显微组织及室温拉伸/压缩力学性能测试,分析Y元素对挤压态镁合金组织和力学性能的影响。结果随着Y的质量分数由0%增加到2.4%,挤压态Mg-Zn-Y-Zr的平均晶粒尺寸由17.9μm减小到7.2μm,拉伸屈服强度由161.2MPa升高至230.8 MPa,压缩屈服强度由127 MPa升高至209 MPa。结论挤压态Mg-Zn-Y-Zr镁合金的晶粒随Y元素含量的增加逐渐细化,室温拉/压强度随Y含量的增加而升高,但相比拉伸屈服强度,镁合金压缩屈服强度随Y含量增加升高得更明显一些。Y含量的增加利于Mg-Zn-Y-Zr镁合金拉压不对称性的改善。The paper aims to study influences of Yttrium content on microstructure and mechanical properties of Mg-Zn-Y-Zr magnesium alloys to provide reference for composition design of magnesium alloy.By metallographic observation and room-temperature tension/compression mechanical tests of hot-extruded Mg-Zn-Y-Zr magnesium alloys of7difference types of Yttrium content,influences of Yttrium content on microstructure and mechanical properties of extruded magnesium alloy were analyzed.With the increase of mass fraction of Y from0%to2.4%,the average grain size of extruded Mg-Zn-Y-Zr decreased from17.9μm to7.2μm;the tensile yield strength increased from161.2MPa to230.8MPa;and the compressive yield strength increased from127MPa to209MPa.Grains of extruded Mg-Zn-Y-Zr magnesium alloys are refined gradually with the increase of Y content and the tension/compression strength at room temperature increase with the increase of Y content.However,compared with the tensile yield strength,the compressive yield strength of magnesium alloy increases more evidently.Therefore,increase of yttrium contributes to the improvement of the tension-compression yield asymmetry(TCYA)of Mg-Zn-Y-Zr magnesium alloy.

关 键 词：Mg-Zn-Y-Zr镁合金 挤压 屈服强度 拉压不对称性 

分 类 号：TG146.2[一般工业技术—材料科学与工程]