大应变挤出切削制备AZ31镁合金超细晶带材工艺研究  

Process Research of Preparing Ultra-fine Grained AZ31 Magnesium Alloy Strip by Large Strain Extrusion Machining

作　　者：梁土荣 王斌[1] 张嘉阳[1] 李庆[1] 

机构地区：[1]华南理工大学机械与汽车工程学院,广州510640

出　　处：《科学技术与工程》2014年第18期10-13,共4页Science Technology and Engineering

摘　　要：运用大应变挤出切削(LSEM)方法,采用前角为15°且切屑压缩比λ可调节(分别为1.5,1.0和0.5)的组合刀具制备了具有超细晶结构的AZ31镁合金带材,分析了带材的成型性和形貌,并对比分析带材的显微组织和测量显微硬度。结果表明,切屑压缩比对带材成型有直接的影响,LSEM能显著地细化AZ31镁合金的晶粒及改善其显微组织;晶粒细化后,AZ31镁合金的维氏硬度获得近33%的提升。By utilizing Large Strain Extrusion Machining （LSEM）and employing a combined tool with a rake angle of 15 °and adjustable chip compressed ratio λ （λ = 1.5,1.0,0. 5, respetively）, a strip of AZ31 magnesium al- loy with ultra-fine grain structure was produced. The strips＇ formability and morphology were analyzed. The metal- lography and microhardness were comparably examined. The results indicate that the chip compressing ratio A had a direct influence to thestrip formability. The process of LSEM could significantly refine the grain and improve the microstructure. The Vickers Hardness of grain-refined strips improved near 33%.

关 键 词：大应变挤出切削 超细晶 AZ31镁合金 带材 显微组织 

分 类 号：TG379[金属学及工艺—金属压力加工]