Microstructure evolution,mechanical properties and tailoring of coefficient of thermal expansion for Cu/Mo/Cu clad sheets fabricated by hot rolling  

热轧制备Cu/Mo/Cu复合板的组织演变、力学性能与热膨胀系数的调控

作　　者：Jiang-jiang LIU Ze-jun CHEN Zhan-song ZHOU Tai-qian MO Peng-ju WANG Wei-jun HE 刘江江;陈泽军;周湛淞;莫太骞;王鹏举;何维均(重庆大学材料科学与工程学院教育部轻合金材料国际合作联合实验室,重庆400044)

机构地区：[1]Joint International Research Laboratory for Light Alloys,Ministry of Education,College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第7期2290-2308,共19页中国有色金属学报（英文版）

基　　金：financial supports from the National Natural Science Foundation of China (No.51421001);the Fundamental Research Funds for the Central Universities,China (Nos.2019CDQY CL001,2019CDCGCL204,2020CDJDPT001);the Research Project of State Key Laboratory of Vehicle NVH and Safety Technology,China (No.NVHSKL-201706)。

摘　　要：The law of microstructure evolution and mechanical properties of hot roll bonded Cu/Mo/Cu clad sheets were systematically investigated and the theoretical prediction model of the coefficient of thermal expansion(CTE)of Cu/Mo/Cu clad sheets was established successfully.The results show that the deformation of Cu and Mo layers was gradually coherent with an increase in rolling reduction and temperature and excellent interface bonding was achieved under the condition of a large rolling reduction.The development of the microstructure and texture through the thickness of Cu and Mo layers was inhomogeneous.This phenomenon can be attributed to the friction between the roller and sheet surface and the uncoordinated deformation between Cu and Mo.The tensile strength of the clad sheets increased with increasing rolling reduction and the elongation was gradually decreased.The CTE of Cu/Mo/Cu clad sheets was related to the volume fraction of Mo.The finite element method can simulate the deformation and stress distribution during the thermal expansion process.The simulation result indicates that the terminal face of the clad sheets was sunken inward.系统研究热轧制备Cu/Mo/Cu复合板的组织演变规律和力学性能,成功建立Cu/Mo/Cu复合板热膨胀系数(CTE)的理论预测模型。结果表明,随着轧制压下量和轧制温度的上升,Cu和Mo层的变形逐渐趋于一致,在较大的轧制压下量下实现良好的界面结合。Cu和Mo层沿厚度方向的显微组织和织构是不均匀的,这种现象可归因于轧辊与板材表面的摩擦以及Cu和Mo之间的不协调变形。复合板的抗拉强度随着轧制率的增加而增加,伸长率逐渐降低。Cu/Mo/Cu复合板的CTE与Mo的体积分数密切相关。有限元方法可以模拟热膨胀过程中的变形和应力分布,模拟结果表明复合板的端面向内凹陷。

关 键 词：Cu/Mo/Cu clad sheets roll bonding collaborative deformation mechanical properties coefficient of thermal expansion prediction model 

分 类 号：TG335.81[金属学及工艺—金属压力加工]