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
代鹏林 1华永乐 1阔洋 1叶杰 2林小娉2
作者信息
- 1. 东北大学 材料科学与工程学院,辽宁 沈阳 110819
- 2. 东北大学 材料科学与工程学院,辽宁 沈阳 110819;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;东北大学秦皇岛分校 资源与材料学院,河北 秦皇岛 066004
- 折叠
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(1.01325×105 Pa))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.
Abstract
The solidification structure and properties of Mg-3Al alloy under graphite mold casting(water cooled at 5℃,1 atm(1.01325×105 Pa))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Key words
Mg-3 Al alloy/microscopic structure/high pressure solidification/mechanical properties引用本文复制引用
基金项目
国家自然科学基金(51675092)
河北省自然科学基金(E2021501019)
出版年
2024
NETL
NSTL
万方数据