Cu/Al侧向复合界面失效分析及性能调控  

Interface failure analysis and performance control of Cu/Al lateral composite

作　　者：王飞[1] 潘晟旻[1] 王梟 钟毅[1] 尹建成[1] WANG Fei;PAN Sheng-min;WANG Xiao;ZHONG Yi;YIN Jian-cheng(School of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093

出　　处：《塑性工程学报》2020年第2期165-173,共9页Journal of Plasticity Engineering

基　　金：国家科技支撑计划(2011BAE13B06)。

摘　　要：采用Conclad连续挤压法制备了Cu/Al侧向复合材料并分析了其界面失效机制。利用扫描电镜、能谱和X射线衍射观察和分析了铜铝复合材料的界面组织及形貌;借助热机械分析仪对Cu/Al复合材料的结合层及基体的热膨胀系数进行了表征。讨论了Cu、Al热成形过程中动态回复与再结晶对其界面结合强度的影响。结果表明:界面结合层的宽度,生成脆硬的金属间化合物Cu Al2、Cu Al和Cu9Al4,结合层与基体之间的热膨胀系数差以及动态结晶与加工硬化产生的内应力是导致界面产生脆性劈裂的主要因素。基于Conclad连续挤压的成形工艺及这类缺陷产生的原因,提出了通过调整模具结构、成形的工艺装备及参数的具体措施并最终得到实验验证。Cu/Al lateral composites were prepared by Conclad continuous extrusion method and the mechanism of interface failure was analyzed. The interface microstructure and morphology of Cu/Al composites were observed by scanning electron microscopy( SEM),energy disterse spectroscopy( EDS) and X-ray diffraction( XRD). The expasion coefficients of the bonding layer and matrix of Cu/Al composite were measured by thermal mechanical analyer( TMA). The effects of dynamic recovery and recrystallization occuring in Cu and Al hot forming on the interfacial bonding strength were discussed. The results show that the main factors related to the brittle fracture include the width of interfacial bonding layer,the generation of brittle hard intermetallic compounds Cu Al2,Cu Al and Cu9 Al4,the difference of linear expansion coefficient between bonding layer and matrix,as well as the internal stress caused by dynamic crystallization and work hardening. Based on the Conclad continuous extrusion forming process and the causes of such defects,the concrete measures including adjusting the die structure and the forming equipment as well as parameter were put forward which were eventually validated by the experiments.

关 键 词：连续挤压工艺 脆性劈裂 热膨胀系数 脆硬相 失效 

分 类 号：TQ331[化学工程—橡胶工业] TG37[金属学及工艺—金属压力加工]