原始组织对等通道角挤压纯铜组织性能的影响  

Effect of original microstructure on microstructure and properties of pure copper subjected to equal channel angular pressing(ECAP)

作　　者：郭廷彪[1] 丁雨田[1] 袁训锋[1] 胡勇[1] 卢振华[1] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料重点实验室,甘肃兰州730050

出　　处：《兰州理工大学学报》2010年第1期1-6,共6页Journal of Lanzhou University of Technology

基　　金：兰州市科技局项目(2009-1-9);兰州理工大学博士基金(SB01200606)的资助

摘　　要：分别对单晶和多晶原始纯铜进行等通道角挤压(ECAP)实验,研究Bc路径挤压后的组织特征和力学性能.结果表明,单晶和多晶铜在挤压过程中晶粒的细化方式明显不同:单晶铜在位错塞积后形成胞状结构,晶粒在位错塞积区发生断裂是其晶粒细化的主要原因;多晶铜在挤压中发生晶粒转动、晶界移动后造成晶粒被拉长并断裂,这是其晶粒细化的主要原因.力学性能对比发现,挤压中单晶铜的硬度和抗拉强度较多晶铜变化显著,认为挤压后单晶铜亚晶的定向排列是延伸率大幅度提高的主要原因.The microstructural feature and mechanical response of monocrystal and polycrystal copper subjected to equal channel angular pressing（ECAP） on route Be was studied. Result showed that the grain refinement mechanism was obviously different in monocrystal and polycrystal copper during extrusion process. After piling-up of dislocations, a cellular structure was formed and it led to grain rupture in monocrystal copper, which was the main reasons of grain refinement. In polycrystalline copper, grain rotation and grain boundary movement would result in grain stretch and rupture so that caused the grain refinement. By comparing the mechanic performance, it was showed that the change of hardness and tensile strength of monocrystal copper was more noticeable than that of polyerystal copper. The orientational disposition of subgrain after extrusion was the main cause of extensive increase of elongation rate in monocrystal copper.

关 键 词：等通道角挤压 晶界 单晶铜 塑性变形 

分 类 号：TG376.3[金属学及工艺—金属压力加工]