摘要
采用光学显微镜、扫描电镜、透射电镜、X射线衍射仪、维氏硬度测试仪和万能力学试验机等研究了固溶和时效热处理对铸造Mg-5Y-2Nd-3Sm-0.5Zr合金组织与力学性能的影响。结果表明：铸态合金组织主要由α-Mg基体,Mg24Y5、Mg41Nd5和Mg41Sm5相组成;经固溶处理,铸态合金中粗大的第二相固溶于α-Mg基体中,时效处理后有新的纳米级第二相析出;铸造Mg-5Y-2Nd-3Sm-0.5Zr合金的最佳热处理工艺为525℃下保温10 h,然后225℃下时效处理12 h,热处理后合金具有最优良的力学性能,硬度、抗拉强度、屈服强度和伸长率分别为124.8 HV,296.9 MPa,255.4 MPa和5.78%。
Effects of solid solution and aging treatment on microstructure and mechanical properties of as-cast Mg-5Y-2Nd-3Sm-0.5Zr alloy were investigated by means of optical microscope（OM）,scanning electron microscopy（SEM） equipped with energy dispersive spectroscopy（EDS）,X-ray diffraction（XRD）,transmission electron microscopy（TEM）,Vickers hardness test and universal mechanical tensile test.The results show that the microstructure of the as-cast alloy is mainly composed of α-Mg matrix,Mg24 Y5,Mg41 Nd5 and Mg41 Sm5 phases.After solid solution treatment,the coarse precipitated phases in the as-cast alloy are dissolved into the α-Mg matrix,and a new nanoscale precipitated phase is observed in the alloy after aging treatment. The optimum heat treatment for the as-cast alloy is solid solution at 525 ℃for 10 h then aging at 225 ℃ for 12 h. After the optimum heat treatment,the alloy has the best mechanical properties,and its hardness,tensile strength,yield strength and elongation are 124. 8 HV,296. 9 MPa,255. 4 MPa and 5. 78%,respectively.
作者
贵云玮
李全安
张兴渊
陈晓亚
王颂博
欧阳云飞
董要港
GUI Yun-wei;LI Quan-an;ZHANG Xing-yuan;CHEN Xiao-ya;WANG Song-bo;OUYANG Yun-fei;DONG Yao-gang(School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China;Collaborative Innovation Center of Nonferrous Metals Henan Province, Luoyang 471023, China)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2018年第5期23-30,共8页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51571084,51171059)
河南省重点科技攻关项目(152102210072)
