Mg-6Zn-3Sn合金的均匀化热处理及其对显微组织和力学性能的影响  

Homogenization treatment of Mg-6Zn-3Sn(wt.%)alloy and its effects on microstructure and mechanical properties

作　　者：刘艳辉 马鸣龙 李兴刚[1,2,3] 李永军 石国梁[1,2,3] 袁家伟 张奎[1,2,3] Yan-hui LIU;Ming-long MA;Xing-gang LI;Yong-jun LI;Guo-liang SHI;Jia-wei YUAN;Kui ZHANG(State Key Laboratory of Nonferrous Metals and Processes,GRINM Co.,Ltd.,Beijing 100088,China;GRIMAT Engineering Institute Co.,Ltd.,Beijing 101407,China;General Research Institute for Nonferrous Metals,Beijing 100088,China)

机构地区：[1]有研科技集团有限公司有色金属材料制备加工国家重点实验室,北京100088 [2]有研工程技术研究院有限公司,北京101407 [3]北京有色金属研究总院,北京100088

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第1期67-78,共12页中国有色金属学报（英文版）

基　　金：financially supported by the Project of Achievement Transformation of Jiangsu Province,China(No.BA2017044)。

摘　　要：利用DSC、OM、XRD、SEM、TEM、维氏硬度计和万能试验机,研究Mg-6Zn-3Sn合金均匀化过程中的显微组织和力学性能演变,分析合金过烧的原因和扩散动力学,确定合金的均匀化制度。结果表明,单级均匀化处理后,Mg_(2)Zn_(3)相分解,同时伴随着Mg_(2)Sn相的析出。当均匀化温度上升到350℃时,Mg_(2)Zn_(3)相导致合金的过烧。合金合适的均匀化制度为(335℃,24 h)+(400℃,6 h)。在双级均匀化过程中,合金的硬度持续下降,力学性能呈现先升后降的趋势,这与Zn和Sn原子的固溶和Mg_(2)Sn相的析出有关。With DSC,OM,XRD,SEM,TEM,Vickers hardness tester,and universal testing machine,the evolution of the microstructure and mechanical properties of Mg-6Zn-3Sn alloy during homogenization was studied,the reason for overburning and diffusion kinetics of the alloy were analyzed,and the homogenization scheme was determined.The results show that the decomposition of the Mg_(2)Zn_(3)phase,accompanied by the precipitation of the Mg_(2)Sn phase,occurs after the single-stage homogenization.When the homogenization temperature increases to 350℃,the Mg_(2)Zn_(3)phase leads to overburning.The suitable homogenization scheme for the alloy is(335℃,24 h)+(400℃,6 h).During the double-stage homogenization,the hardness of the alloy decreases continuously and the mechanical properties show an increase first and then decrease,which is related to the solid solution of Zn and Sn atoms and the precipitation of the Mg_(2)Sn phase.

关 键 词：ZT63镁合金 均匀化 显微组织 扩散动力学 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]