多级断续时效对Mg-Zn-Mn合金显微组织和力学性能的影响  

Microstructure and properties characteristic during interrupted multi-step aging(T6I6)in Mg-Zn-Mn alloy

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

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

出　　处：《重庆大学学报（自然科学版）》2013年第9期101-105,共5页Journal of Chongqing University

基　　金：国家十二五科技支撑计划项目(2011BAE22B03-3)

摘　　要：为探索镁合金的多级时效工艺,利用X射线衍射、光学金相、扫描电镜以及能谱分析、透射电镜、显微硬度、力学性能测试等实验手段,研究了多级断续时效(T6I6)对ZM61新型镁合金显微组织和力学性能的影响。结果表明,与T6态相比,T6I6工艺更能显著提高合金强度,显微硬度为90HV,屈服强度为340MPa,抗拉强度达到356MPa,强度增幅分别为13%和8%;T6I6处理使合金晶间干净,第一级和第二级过程中只有Mn以α-Mn的形式继续析出,形成更多的Mn单质颗粒,终级时效的硬化幅度增加,且峰时效时析出了弥散分布的β′相,使强化效应得到充分发挥。For researching the interrupted multi-step aging techniques of Mg alloy, the effects of T616 on microstructures and mechanical properties of the new alloy ZM61 is studied by XRD analysis, optical microscopy, electronic microscopy and EDS, TEM, hardness and mechanical properties tests, etc. The results show that the T616 techniques, compared with T6, improve alloy strength more notably. The hardness of ZM61 after treated by T616 is 90 HV, YS is 340 MPa, UTS 356 is MPa, and the increased ratio of strength are 13% and 8% respectively. During the first step and second step of T616, only Mn continues to precipitate as α-Mn and forms more Mn simple particles. The grain boundaries of ZM61 alloy become clean during T616 treatment. The scope of strengthen increases sharply in third-step aging and the β＇ precipitates distribute dispersively in the matrix while the strengthen effect been exerted drastically.

关 键 词：T6I6处理 ZM61合金 显微组织 力学性能 

分 类 号：TG156.92[金属学及工艺—热处理]