热处理对挤压变形电磁连铸AZ61镁合金的影响  

Effects of Heat Treatment on As-extruded Electromagnetic Continuous Casting AZ61 Magnesium Alloy Billets

作　　者：隋里[1] 任政[1] 房灿峰[1] 吴友芳[1] 张兴国[1] 

机构地区：[1]大连理工大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2010年第6期540-543,共4页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(50475157);教育部重点资助项目(105052)

摘　　要：研究了固溶、时效对挤压变形电磁连铸AZ61镁合金组织性能的影响。结果表明,挤压可以显著细化AZ61镁合金电磁连铸铸锭组织,使铸锭性能得到大幅度提高。经过热挤压的AZ61(EMC)镁合金中几乎不存在β-Mg17Al12相,挤压锭固溶处理后的组织晶粒长大。时效处理后,合金中出现不连续析出和连续析出的β-Mg17Al12相,使得合金的抗拉强度和硬度得到了一定程度的提高,而伸长率略有降低。Effects of solid solution,ageing on microstructure and properties of as-extruded electromagnetic continuous casting AZ61 billets were investigated. The results show that properties of the electromagnetic continuous casting AZ61 magnesium alloy billets are greatly improved as a result of obvious refinement of grain size by extrusion. Absence of β-Mg17Al12 phase in as-extruded EMC AZ61 magnesium alloy can be observed. Grain size becomes coarse in the as-extruded ingot after solid solution. After ageing treatment,discontinuous and continuous precipitated β-Mg17Al12 phase appears in the alloy again,which results in the improvement of tensile strength and hardness to some extent and slight decrease of elongation.

关 键 词：AZ61合金 固溶 时效 挤压 电磁场 

分 类 号：TG379[金属学及工艺—金属压力加工]