纯铝圆形挤压件等通道弯角挤压微观组织与力学性能  

Microstructure and mechanical properties of circular extrusion parts of pure aluminium for equal channel angular extrusion

作　　者：徐淑波[1,2] 张森 景财年[1] 林晓娟[1] 刘鹏[1] XU Shu-bo;ZHANG Sen;JING Cai-nian;LIN Xiao-juan;LIU Peng(School of Materials Science and Engineering,Shandong Jianzhu University,Jinan 250101,China;Die&Mould Technology National Key Laboratory,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]山东建筑大学材料科学与工程学院,山东济南250101 [2]华中科技大学材料成形与模具技术国家重点实验室,湖北武汉430074

出　　处：《塑性工程学报》2021年第8期133-139,共7页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(41305124);山东省重点研发计划项目(2017GGX30128);2019年山东省新旧动能转换重大课题攻关项目;材料成形与模具技术国家重点实验室开放基金资助项目(P12)。

摘　　要：通过对纯铝圆形挤压件进行等通道弯角挤压实验,对挤压件进行微观组织观测与分析。在实验中对试样进行阳极覆膜处理,系统分析了纯铝挤压件挤压前后的微观组织演变规律和力学性能变化特点。发现挤压件经单道次挤压后,晶粒尺寸由200~500μm细化至1μm,经多道次挤压后细化至400~700 nm,对各道次挤压件的截面进行硬度测试,发现挤压件横截面上的硬度在第1和第2道次上升较快,随后缓慢上升,但不明显,且硬度在横截面上的分布不均匀。在3种挤压路线中,路线A虽能够获得较高的硬度,但其显微硬度分布最不均匀,经路线B和路线C挤压后,挤压件横截面上的硬度分布较均匀,晶粒均匀细化效果更显著。Through the equal channel angular extrusion experiment of pure aluminum circular extrusion parts,the microstructure of the extrusion part was observed and analyzed.In the experiment,the samples were treated with anodic coating.The microstructure evolution and changing characteristics of mechanical properties of pure aluminum extrusion parts before and after extrusion were systematically analyzed.It is found that the grain size of extrusion parts is refined from 200-500μm to 1μm after a single pass extrusion,and after several passes of extrusion,it is refined to 400-700 nm.The hardness test was carried out on the cross section of extruded parts of each pass.It is found that the hardness of the cross section of extruded parts increases rapidly in the first and the second passes,and then increases slowly,but it is not obvious,and the distribution of hardness on the cross section is uneven.Among the three extrusion routes,route A can obtain higher hardness,but the microhardness distribution of route A is the most uneven.The hardness distribution on the cross section of the extrusion parts is more uniform after the path B and path C extrusion,and the effect of grain uniformity refinement is more significant.

关 键 词：等通道弯角挤压 超细晶粒 微观组织 等轴晶粒 

分 类 号：TG376[金属学及工艺—金属压力加工]