新型复合挤压工艺中温度对AZ61组织和性能的影响  

Effects of Temperature in the New Compound Extrusion on Microstructures and Properties of AZ61

作　　者：张丁非[1,2] 耿青梅 杨绪盛 余大亮 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：《材料工程》2014年第7期1-4,共4页Journal of Materials Engineering

基　　金：国家973重大基础研究项目(2013CB632200);国家十二五科技支撑计划项目(2011BAE22B01-3);科技部国际合作项目(2010DFR50010);国家自然科学基金(51101176)

摘　　要：针对镁合金棒材的工业化制备和加工,提出了一种新型的复合挤压方式,将正挤压(Extrusion)和剪切(Shear)结合(简称ES)。对经过不同温度下ES变形后AZ61镁合金棒材进行微观组织观察、硬度测试、室温拉伸性能测试及SEM,研究了ES变形工艺中变形温度对AZ61挤压棒材组织及性能的影响。结果表明:温度由380℃升至400℃时,动态再结晶进行得更充分,组织为细小等轴晶粒,但温度升至440℃时,晶粒出现长大;三个温度下断口均呈现塑性断裂特征,400℃时棒材的综合力学性能最好,其抗拉强度为296.7MPa,屈服强度为158.9MPa,伸长率为15.4%。A new composite extrusion （shorten ES ） combining extrusion and shear was presented, forthe industrial preparation and process of magnesium alloy rods. Microstructures, hardness test, ten-sile test and SEM experiments were used to investigate the effects of temperature on microstructureand properties of AZ61 magnesium alloy deformed by ES. The results show that, when the tempera-ture increases from 380℃ to 400℃, dynamic recrystallization becomes more fully and more recrystal-lized grains are generated. But when the temperature rises to 440℃, grains grow up. The fractogra-phy shows ductile fracture＇characteristics under these three temperatures. And at the temperature of400℃, the bars have the best comprehensive mechanical properties with tensile strength of296.7MPa, yield strength of 158.9MPa and elongation of 15.4%.

关 键 词：AZ61镁合金 ES变形 微观组织 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]