固溶时间对铸态AZ91D镁合金组织与力学性能影响研究  

Effect of Solution Time on Microstructure and Mechanical Properties of As-cast AZ91D Magnesium Alloy

作　　者：朱永焕 Zhu Yonghuan(Department of Mechanical Engineering,Luohe Technician College,Luohe Henan 462300,China)

机构地区：[1]漯河技师学院机械工程系,河南漯河462300

出　　处：《山西冶金》2024年第3期62-63,123,共3页Shanxi Metallurgy

摘　　要：镁合金在冶金过程中,其组织与力学性能受热处理的影响很大,通过控制铸态镁合金的固溶时间获得固溶态AZ91D合金,并对制得的镁合金试样进行微观组织和力学性能测试。研究结果表明:铸态基体内存在许多枝晶结构,含有许多大尺寸αMg相,晶界处形成了大量的网型β相;增加固溶时间后,形成了尺寸更大的晶粒,从而降低了材料力学强度;经过固溶处理后AZ91D合金硬度降低,随着固溶时间的增加,硬度进一步降低;固溶处理后AZ91D合金拉伸强度和压缩强度增大,经过6 h固溶处理获得的AZ91D合金力学强度增大了20%以上。该研究为后续的镁合金强化奠定了一定的理论基础。Magnesium alloy is greatly affected by heat treatment in the metallurgical process.Solid-solution AZ91D alloy was obtained by controlling the solution time of as-cast magnesium alloy,and the microstructure and mechanical properties of the obtained magnesium alloy samples were tested.The results show that there are many dendrite structures in the as-cast matrix,containing many large size α Mg phases,and a large number of net β phases formed at the grain boundaries.With the increase of solution time,larger grain size is formed and the mechanical strength of the material is reduced.After solution treatment,the hardness decreases further with the increase of solution time.The tensile strength and compressive strength increased after solution treatment,and the mechanical strength of AZ91D alloy obtained after 6h extrusion increased by more than 20%.This study lays a theoretical foundation for the subsequent strengthening of magnesium alloys.

关 键 词：AZ91D合金 固溶处理 微观组织 力学性能 

分 类 号：TG146[一般工业技术—材料科学与工程]