石墨坩埚铸造Mg-4Al-0.5Me合金的凝固组织与性能  

Solidification Microstructure and Properties of Mg-4Al-0.5Me Alloys Cast by Graphite Crucible

作　　者：阔洋 代鹏林 林小娉 KUO Yang;DAI Penglin;LIN Xiaoping(School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China;School of Resources and Materials,Northeastern University at Qinhuangdao,Qinhuangdao 066004,China;State Key Laboratory of Rolling and Automation,Shenyang 110819,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资源与材料学院,河北秦皇岛066004 [3]轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《热加工工艺》2023年第15期72-74,79,共4页Hot Working Technology

基　　金：国家自然科学基金项目(51675092,51775099);河北省自然科学基金面上项目(E2018501032,E2018501033)。

摘　　要：利用SEM、EDS、XRD研究了利用石墨坩埚铸造Mg-4Al-0.5Me(Nd,Y,Ca)合金的凝固组织以及性能。结果表明,合金的凝固组织主要由α-Mg和β-Mg17Al12组成。Mg-4Al-0.5Nd和Mg-4Al-0.5Y合金的组织较为粗大,且沿晶界有析出的颗粒相;在Mg-4Al中添加少量Ca元素后,组织得到了有效细化。Mg-4Al-0.5Nd与Mg-4Al-0.5Y合金的显微硬度分别为50.78、50.82 HV;Mg-4Al-0.5Ca合金的显微硬度则有显著提升,达到60.8 HV;三种合金的抗压强度分别为330.14、334.56、361.77 MPa。The solidification structure and properties of Mg-4Al-0.5Me(Nd,Y,Ca)alloys cast by graphite crucible were studied by SEM,EDS and XRD.The results show that the solidification structure of the alloys is mainly composed ofα-Mg andβ-Mgi7Alz.The structure of Mg-4A1-0.5Nd and Mg-4A1-0.5Y alloys is coarse and has granular phase precipitated along the grain boundary.After adding a small number of Ca element to Mg-4Al,the structure is effectively refined.The micro-hardness of Mg-4A1-0.5Nd and Mg-4 A1-0.5Y alloy is 50.78 HV and 50.82 HV,respectively.The micro-hardness of Mg-4A1-0.5Ca alloy is significantly improved to 60.8 HV.The pressure strength of the three alloys is 330.14 MPa,334.56 MPa and 361.77MPa,respectively.

关 键 词：Mg-4Al合金 显微组织 力学性能 

分 类 号：TG292[金属学及工艺—铸造]