热处理对Mg-Zn-Mn镁合金组织和性能的影响  

Effects of heat treatment on microstructure and properties of Mg-Zn-Mn magnesium alloy

作　　者：张丁非[1,2] 朱曾涛[1] 吴颖[1] 赵霞兵[1] 齐福刚[1] 潘复生[1,2] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400045 [2]国家镁合金材料工程技术研究中心,重庆400044

出　　处：《材料热处理学报》2013年第2期90-95,共6页Transactions of Materials and Heat Treatment

基　　金：国家"973"重大基础研究项目(2007CB613700);国家"十二五"科技支撑计划项目(2011BAE22B03-3);科技部国际合作项目(2010DFR50010)

摘　　要：通过光学金相、扫描电镜以及能谱分析、显微硬度和室温力学性能测试、X射线衍射分析,研究了不同热处理工艺对Mg-6%Zn-1%Mn(ZM61)镁合金组织和力学性能的影响。结果表明,ZM61在420℃下挤压成型后,合金完成动态再结晶并形成了细小的再结晶晶粒;与挤压态相比,挤压后直接时效(T5)处理可以提高合金的强度,但"固溶+时效"处理(T6,T4+双级时效)能更大幅度地强化ZM61镁合金,其抗拉强度最高可达362 MPa,说明人工时效前的固溶处理是必要的,且最佳的固溶处理工艺是420℃×2 h;挤压后直接时效的ZM61合金的失效形式为混合断裂,而经"固溶+时效"处理后为解理断裂。Effects of different heat treatment on microstructure and properties of wrought Mg-Zn-Mn （ZM61） alloy were studied by means of optical microscopy, electronic microscopy and EDS, hardness tests, tensile tests and XRD analysis. The results show that the new ZM61 alloy can be smoothly extruded at 420 ~C , complete dynamic recrystallization takes place and fine recrystallized grains are formed during this process. Compared with the as-extruded alloy, T5 treatment can improve the strength of the ZM61 alloy, and the properties of the ZM61 magnesium are further improved by solution and aging treatments （T6, T4 ＋ two-stage aging）, the tensile strength of the alloy can be up to 362 MPa after T4 ＋ 2-step-aging. It is confirmed that the solution treatment is very necessary before aging, and the best solution treatment process of wrought ZM61 alloy is 420℃×2 h. The failure mode of the ZM61 alloy directly aged after extrusion（T5） is mixed fracture, but cleavage fracture prevails for the alloy after solution and aging treatment.

关 键 词：ZM61镁合金 挤压 固溶 时效处理 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]