GPa级高压对Mg-3Al合金凝固组织及性能的影响  

Effects of GPa-level High Pressure on Solidification Structure and Properties of Mg-3Al Alloy

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

出　　处：《热加工工艺》2024年第9期80-83,共4页Hot Working Technology

基　　金：国家自然科学基金项目(51675092);河北省自然科学基金项目(E2021501019)。

摘　　要：利用XRD、SEM、EDS研究了Mg-3Al合金在石墨型铸造(5℃水冷,1 atm(1.01325×105Pa))和高压凝固条件下(2、3 GPa)的凝固组织及性能。结果表明,Mg-3Al合金在不同凝固压力下均由α-Mg组成,但其组织形貌由石墨型铸造的等轴状转变为高压下的枝晶团状;GPa级高压能使Mg-3Al合金中更多的Al溶质固溶到α-Mg基体,同时也可以溶质原子的形式存在于枝晶间和晶界处发生偏聚现象。在3 GPa高压下Mg-3Al合金的抗压强度达到372 MPa,硬度达到46 HV,两者显著高于石墨型铸造Mg-3Al合金的356 MPa和41 HV。The solidification structure and properties of Mg-3Al alloy under graphite mold casting(water cooled at 5℃,1 atm(1.01325×105Pa))and high-pressure solidification(2 and 3 GPa)were studied by XRD,SEM and EDS.The results show that Mg-3Al alloy is composed of α-Mg at different solidification pressures,but its microstructure changes from equiaxed graphite casting to dendritic clusters under high pressure.The GPa-level high pressure can make the Al solute atoms in Mg-3Al alloy more solidly dissolve into the α-Mg matrix,and at the same time,the solute atoms can also be segregated in the form of interdendritic and grain boundary.The compressive strength and hardness of Mg-3Al alloy at 3 GPa are 372 MPa and 46 HV,respectively,which are significantly higher than those of graphite cast Mg-3Al alloy at 356 MPa and 41 HV.

关 键 词：Mg-3Al合金 显微组织 高压凝固 力学性能 

分 类 号：TG249.2[金属学及工艺—铸造]