杨玲,侯华,赵宇宏,杨晓敏,郝小军

• 1:中北大学材料科学与工程学院

摘要(Abstract)：

采用常规铸造法制备了Mg-45Zn-1.5Nd三元合金,利用SEM、EDS、XRD、硬度及拉伸实验等方法,研究了热处理对Mg-45Zn-1.5Nd合金组织及性能的影响规律。结果表明:铸态组织由Mg7Zn3基体、α-Mg枝晶、α-Mg+MgZn共晶组织以及极少量的球状准晶相组成;退火后α-Mg枝晶和共晶组织溶入基体中,析出了球状准晶相,组织均匀化程度显著提高;热处理使Mg-45Zn-1.5Nd合金的性能大幅度提高,硬度和抗拉强度最高分别达到141.9 HB和168 MPa,比铸态合金提高了14.3%和48.7%,最佳热处理工艺为330℃×6 h;热处理后拉伸断口中尽管出现少量韧窝,但仍是以解理为主的脆性断裂。

关键词(KeyWords)： Mg-Zn-Nd合金;热处理;显微组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51204147,51274175,50975263);; 科技部国际合作项目(2011DFA50520);; 山西省回国留学人员科研项目(2011-重点6);; 山西省研究生优秀创新项目(20123088)

作者(Author): 杨玲,侯华,赵宇宏,杨晓敏,郝小军

DOI: 10.13289/j.issn.1009-6264.2014.08.010

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