快速凝固Mg-Zn-Y合金薄带的制备及凝固组织特征  

Preparation and Solidified Structural Characteristics of Rapidly Solidified Mg-Zn-Y Alloy

作　　者：刘静远[1] 张振忠[1] 华旻[1] 马立群[1] 沈晓冬[1] 

机构地区：[1]南京工业大学材料学院,江苏南京210009

出　　处：《铸造技术》2006年第3期258-262,共5页Foundry Technology

基　　金：某重点基金(6140502)项目;南京工业大学引进人才科研启动基金(51303021)项目

摘　　要：在成功制备Mg97.46Zn0.80Y1.74合金、Mg96.51Zn0.83Y2.67合金急冷快速凝固薄带的基础之上,采用XRF、XRD、SAD、DSC、SEM、显微硬度测量等分析方法系统研究了其凝固组织及显微硬度。结果表明:急冷快速凝固条件下,2种合金均形成非晶相+超细Mg12YZn相+超细hcp-Mg(Zn,Y)相,其显微硬度值大幅度提高;快速凝固Mg97.46Zn0.80Y1.74合金薄带中的hcp-Mg(Zn,Y)相晶胞在a1、a2、a3轴方向膨胀、在c轴方向收缩;快速凝固Mg96.51Zn0.83Y2.67合金薄带中的hcp-Mg(Zn,Y)相晶胞在各轴向均有膨胀;Mg96.51Zn0.83Y2.67合金薄带的熔点及热稳定性高于Mg97.46Zn0.80Y1.74合金薄带。同时对以上结果产生的原因进行了初步探讨。Based on the successful preparation of rapidly solidified Mg97.46Zn0.80Y1.74 and Mg96.51Zn0.83Y2.67 melt spinning ribbons, their solidified structure and microhardness were studied systematically by XRF, XRD, SAD, DSC, SEM and microhardness measurement. The results indicate that： （1） in the condition of rapid solidification, the solidification microstructure of both alloys are amorphous phase ＋ ultra-fine MgnYZn phase ＋ ultra-fine hcp-Mg（Zn,Y） phase. Compared with their mother alloys, the microhardness values increase tremendously; （2） in the rapidly solidified Mg97.46Zn0.80Y1.74 melt spinning ribbons, the unit cells of hcp-Mg（Zn,Y） phase are expanded in the axis of a1, a2. and a3, whereas they are shrunk in the direction of c axis. In the rapidly solidified Mg96.51Zn0.83Y2.67 melt spinning ribbons, the unit cells of hcp-Mg（Zn, Y） phase are expanded in all axis; （3） the melting point and thermal stability of Mg96.51Zn0.83Y2.67 melt spinning ribbons are both higher than those of Mg97.46Zn0.80Y1.74 melt spinning ribbons. The reasons of the results mentioned above are explored preliminarily.

关 键 词：MG-ZN-Y合金 快速凝固 凝固组织 显微硬度 

分 类 号：TG27[金属学及工艺—铸造]