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
苏再军 1默辰星 2陈东瑞 2梁秋贤 3陈卓夫3
作者信息
- 1. 共青科技职业学院机电工程学院,江西九江 332020;广东辉煌金属制品有限公司,广东肇庆 526200;邵阳学院机械与能与能源工程学院,湖南邵阳 422000
- 2. 邵阳学院机械与能与能源工程学院,湖南邵阳 422000
- 3. 广东辉煌金属制品有限公司,广东肇庆 526200
- 折叠
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Mg12Nd相和Mg24Y5相已熔入基体,仅在晶界中存在有Mg12YZn相;随着Zn含量的增加,Mg12YZn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Mg12YZn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.
Abstract
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 microsco-py(SEM),energy spectrometer(EDS)and X-ray diffractometry(XRD),including the mechanical properties test.It is obvious that Mg12Nd and Mg24Y5 phases in the solid solution alloy are dissolved into the matrix,while Mg12YZn phase exists at the grain boundary.With the increase of Zn content,the volume fraction of Mg12YZn 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 Mg12YZn 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Key words
Mg-Y-Nd-Zn-Zr alloy/solid solution/microstructure/mechanical properties/strengthening mechanism引用本文复制引用
基金项目
湖南省自然科学基金(2018JJ2365)
广东省科技创新战略专项(攀登计划)(pdjh2021b0887)
广州市科技计划(202102080049)
出版年
2024
NETL
NSTL
万方数据