准晶增强Mg-Zn-Y合金显微组织及凝固过程研究  

Study on Microstructure and Solidification Process of Quasicrystal Reinforced Mg-Zn-Y Alloy

作　　者：叶杰 林小娉[1,2,3] 刘凤芳 付守军[4] YE Jie;LIN Xiao-ping;LIU Feng-fang;FU Shou-jun(School of Materials Science and Engineering,Northeastern University,Shenyang 110819,Liaoning,China;Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province,Northeastern University at Qinhuangdao,Qinhuangdao 066004,Hebei,China;Key Laboratory of Advanced Metal Materials and Forming Technology in Qinhuangdao,Northeastern University at Qinhuangdao,Qinhuangdao 066004,Hebei,China;CITIC Dicastal Co.,Ltd.,Qinhuangdao 066011,Hebei,China)

机构地区：[1]东北大学材料科学与工程学院,辽宁沈阳110819 [2]东北大学秦皇岛分校,河北省电解质与电介质功能材料重点实验室,河北秦皇岛066004 [3]东北大学秦皇岛分校,秦皇岛市先进金属材料及成型技术重点实验室,河北秦皇岛066004 [4]中信戴卡股份有限公司工程技术研究院,河北秦皇岛066011

出　　处：《铸造》2024年第9期1233-1237,共5页Foundry

基　　金：中央高校基本科研业务费(N2323012);河北省自然科学基金(E2022501001)。

摘　　要：采用SEM、XRD、DSC和Factsage 8.0热力学计算软件研究了Mg-9.02Zn-1.68Y合金的显微组织和凝固过程。研究表明,Mg-9.02Zn-1.68Y合金室温组织主要由α-Mg、准晶I-Mg3Zn6Y和Mg_(7)Zn_(3)相组成,其凝固过程为先结晶出枝晶α-Mg,之后发生二元共晶转变形成(α-Mg+I-Mg_(3)Zn_(6)Y)共晶组织,最后随着温度降低形成少量(α-Mg+Mg_(7)Zn_(3))共晶组织。由于试验合金中存在含量较高的准晶I-Mg3Zn6Y相,其硬度达HV70,从而为后续再加工或时效热处理打下良好的性能基础。The microstructure and solidification process of Mg-9.02Zn-1.68Y alloy were studied by SEM,XRD,DSC and Factsage 8.0 thermodynamic calculation software.The results show that the room temperature microstructure of Mg-9.02Zn-1.68Y alloy is mainly composed ofα-Mg,quasicrystalline I-Mg7Zn6Y and Mg_(7)Zn_(3).The solidification process of Mg-9.02Zn-1.68Y alloy is that dendriticα-Mg is crystallized first,then binary eutectic transformation takes place to form(α-Mg+I-Mg_(7)Zn_(6)Y)eutectic structure,and finally a small amount of(α-Mg+Mg_(7)Zn_(3))eutectic structure is formed with the decrease of temperature.Due to the high content of quasicrystalline I-Mg3Zn6Y phase in the experimental alloy,the hardness of the alloy is HV70,which lays a good foundation for subsequent reprocessing or heat treatment.

关 键 词：MG-ZN-Y合金 准晶增强 显微组织 凝固过程 

分 类 号：TG146.2[一般工业技术—材料科学与工程]