等径道角挤压制备高力学性能细晶Mg-6Al合金

材料科学与工艺, 2010, 18(3): 410-414.

等径道角挤压制备高力学性能细晶Mg-6Al合金

王迎 ^1, , 姜巨福 ^2, , 孙毅 ^3, , 曲建俊 ^4, , 杜之明 ^5, , 罗守靖 ^6,

1.哈尔滨工业大学,机电工程学院,哈尔滨,150001;哈尔滨工业大学力学博士后流动站,哈尔滨150001

2.哈尔滨工业大学,材料科学与工程学院,哈尔滨,150001;哈尔滨工业大学机械工程博士后流动站,哈尔滨,150001

3.哈尔滨工业大学力学博士后流动站,哈尔滨150001

4.哈尔滨工业大学机械工程博士后流动站,哈尔滨,150001

5.哈尔滨工业大学,材料科学与工程学院,哈尔滨,150001

6.哈尔滨工业大学,材料科学与工程学院,哈尔滨,150001

基金项目: 中国博士后基金项目(20090460884;20080440849) 哈尔滨工业大学优秀青年教师培养计划资助(HITQNJS.2008.012) 黑龙江省博士后启动基金(LBH-Q08104) 国家自然科学基金资助项目(50605015)

关键词：等径道角挤压 , Mg-6Al合金 , 微观组织 , 力学性能

Preparing Mg-6Al alloy with high mechanical properties and fine grains by equal channel angular extrusion

为了制备高力学性能细晶Mg-6Al合金坯料,采用金相显微镜、材料拉伸实验机等手段对Mg-6Al合金铸坯进行等径道角挤压实验研究.并利用热处理工艺对挤压后材料进行处理,研究热处理工艺参数对材料力学性能的影响规律.结果表明,Mg-6Al合金的铸坯的抗拉强度为196.4 MPa,延伸率为12.6%.经过等径道角挤压的Mg-6Al合金坯料的晶粒被大大细化,其晶粒尺寸由铸坯的140 μm左右细化到8 μm左右.其力学性能有很大提高,抗拉强度由196.4 MPa提高到308.2 MPa;延伸率由12.6%提高到30.6%.等径道角挤压工艺是一种非常好的制备高力学性能、细晶Mg-6Al合金的工艺方法.固溶和人工时效热处理工艺对等径道角挤压的Mg-6Al合金坯料的强度有较大影响,对延伸率影响较小.

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