冷拉拔对单晶Cu晶粒取向及断裂机理的影响  

Effects of Cold Drawing on Grain Orientation and Fracture Mechanism of Single Crystal Copper

作　　者：华云筱 宋克兴[1,2,3] 何季麟 皇涛 周延军[1,2,3] 封存利 丁雨田[6] 刘海涛 胡勇 曹军[7] 张朝民 程楚[1,2,3] Hua Yunxiao;Song Kexing;He Jilin;Huang Tao;Zhou Yanjun;Feng Cunli;Ding Yutian;Liu Haitao;Hu Yong;Cao Jun;Zhang Chaomin;Cheng Chu(School of Materials Science and Engineering,Henan University of Science and Technology;Collaborative Innovation Center of New Nonferrous Materials and Advanced Processing Technology;Henan Key Laboratory of Nonferrous Materials Science and Processing;School of Materials Science and Engineering,Zhengzhou University;Henan Senge Material Technology Co.,Ltd.;School of Materials Science and Engineering,Lanzhou University of Technology;School of Mechanical and Power Engineering,Henan Polytechnic University)

机构地区：[1]河南科技大学材料科学与工程学院 [2]有色金属新材料与先进加工技术省部共建协同创新中心 [3]河南省有色金属材料科学与加工技术重点实验室 [4]郑州大学材料科学与工程学院 [5]河南森格材料科技有限公司 [6]兰州理工大学材料科学与工程学院 [7]河南理工大学机械与动力工程学院

出　　处：《特种铸造及有色合金》2020年第12期1436-1440,共5页Special Casting & Nonferrous Alloys

基　　金：国家重点研发计划资助项目(2016YFB0301400);河南省创新引领专项基金资助项目(191110210400);河南省高等学校重点科研资助项目(19A430012);洛阳市科技重大专项基金资助项目(1901006A);河南省杰出人才创新基金资助项目(182101510003)。

摘　　要：采用自制的热型水平连铸设备制备出φ16mm的铸态单晶Cu杆坯,并对其进行单道次冷拉拔加工制备出φ12mm的拉拔态杆坯。借助XRD、SEM等分析手段,结合室温拉伸试验,研究了冷拉拔对单晶Cu晶粒取向及断裂机理的影响。结果表明,拉拔前后单晶Cu横截面晶粒取向明显改变,织构组分增多,纵截面织构组分不变但体积分数发生变化。冷拉拔对单晶Cu断裂机理影响显著,铸态单晶Cu为微孔-韧窝聚集型断裂,拉拔态Cu试样为微孔长大型断裂。The as-cast single crystal copper bar billet with φ16 mm was prepared by self-made heated mold horizontal continuous casting equipment, and the as-drawn bar billet with φ12 mm was produced by single-pass cold drawing. The effects of cold drawing on grain orientation and fracture mechanism of single crystal copper were investigated by means of XRD, SEM, combined with tensile tests at room temperature.The results reveal that the cross-section grain orientation of single crystal copper is changed obviously after drawing, exhibiting the increased texture component. The longitudinal-section texture component is remained. However, the volume fraction is varied. The cold drawing has significant influence on the fracture mechanism, which presents as a micropore-dimple aggregation fracture for as-cast specimens, while presents as a micropore growth fracture for as-drawn specimens.

关 键 词：冷拉拔 热型连铸 单晶Cu 晶粒取向 断裂机理 

分 类 号：TG146.11[一般工业技术—材料科学与工程] TG249.7[金属学及工艺—金属材料]