锌对固溶态Mg-Y-Nd-Zr合金显微组织及力学性能的影响  

Effect of Znic on Microstructure and Mechanical Properties of Solid Solution Mg-Y-Nd-Zr Alloy

作　　者：苏再军 默辰星 陈东瑞 梁秋贤 陈卓夫 Su Zaijun;Mo Chenxing;Chen Dongrui;Liang Qiuxian;Chen Zhuofu(School of Mechatronic Engineering,Gongqing institute of Science and Technology,Jiujiang 332020,China;Guangdong Huihuang Metal Products Co.,Ltd.,Zhaoqing 526200,China;Department of Mechanical and Energy Engineering,Shaoyang University,Shaoyang 422004,China)

机构地区：[1]共青科技职业学院机电工程学院,江西九江332020 [2]广东辉煌金属制品有限公司,广东肇庆526200 [3]邵阳学院机械与能与能源工程学院,湖南邵阳422000

出　　处：《中国稀土学报》2024年第3期568-573,共6页Journal of the Chinese Society of Rare Earths

基　　金：湖南省自然科学基金项目(2018JJ2365);广东省科技创新战略专项资金(攀登计划)项目(pdjh2021b0887);广州市科技计划项目(202102080049)资助。

摘　　要：采用光学显微镜(OM)、扫描电子显微镜(SEM)、能谱分析(EDS)、X射线衍射分析(X-ray)及力学性能测试等手段研究少量Zn元素(0,0.5%,1.0%,1.5%(质量分数))对固溶态Mg-Y-Nd-Zr合金显微组织及抗拉力学性能的影响。研究表明:经固溶处理后,合金中的Mg_(12)Nd相和Mg_(24)Y_(5)相已熔入基体,仅在晶界中存在有Mg_(12)YZn相;随着Zn含量的增加,Mg_(12)YZn相的体积分数逐渐增加,合金的抗拉强度、屈服强度和伸长率先升高后降低。Zn含量为0.5%时,固溶态合金的抗拉强度、屈服强度达到最大值:252,158 MPa;提高Zn含量到1.0%时,合金的伸长率达到最大值13.2%。对固溶态合金屈服强度贡献最大的因素为固溶强化,占总强度值的54%以上。随Zn含量的增加,生成的Mg_(12)YZn相体积分数增加,导致固溶强化效果随之下降,第二相强化效果略有提高。Effects of Zn(0,0.5,1.0,1.5(%,mass fraction))on microstructure and mechanical properties of Mg-Y-Nd-Zr solid solution alloys were investigated by the optical microscopy(OM),scanning electron microscopy(SEM),energy spectrometer(EDS)and X-ray diffractometry(XRD),including the mechanical properties test.It is obvious that Mg_(12)Nd and Mg_(24)Y_(5) phases in the solid solution alloy are dissolved into the matrix,while Mg_(12)YZn phase exists at the grain boundary.With the increase of Zn content,the volume fraction of Mg_(12)YZn phase increases gradually,the tensile strength,yield strength and elongation of the alloys increase first and then decrease.When Zn content is 0.5%,the tensile strength and yield strength of the solid solution alloy reach the maximum values,which are 252 and 158 MPa,respectively.When the Zn content increases to 1.0%,the maximum elongation of the alloy reaches 13.2%.The most significant factor contributing to the yield strength of the alloy is solid solution strengthening,which accounts for more than 54%.With the increase of Zn content,the volume fraction of Mg_(12)YZn phase increases,which results in the solid solution strengthening decreasing,while the strengthening effect of the second phase slightly increases.

关 键 词：Mg-Y-Nd-Zn-Zr合金 固溶 显微组织 力学性能 强化机制 

分 类 号：TG146.2[一般工业技术—材料科学与工程]