摘要
在200℃保温条件下进行铜/铝层状复合板的高温拉伸试验,采用SEM、TEM、EDS表征分析了复合板的组织演变与断裂行为,研究了界面组织对复合板高温拉伸力学性能的影响.结果表明:冷轧复合板的基体层之间紧密结合,经过退火处理后,铜/铝界面发生显著的元素互扩散,在350℃时生成以金属间化合物为主要成分的界面层;高温拉伸过程复合板的断裂源位于铜/铝界面层,当界面结合强度较低时,裂纹沿铜/铝层间快速扩展,基体层间的力学性能差异使界面承受附加拉应力加剧了界面断裂失效;300℃退火处理的铜/铝复合板在高温拉伸过程具有较好的界面稳定性,界面强化效应明显,复合板的屈服强度为106.6 MPa,而且拉伸断口各基体层保持良好结合状态.
The tensile tests of copper/aluminum laminates were carried out under the elevated temperature of 200℃.The microstructure evolution and fracture behavior were characterized by SEM,TEM and EDS.The effects of interfacial microstructure on tensile mechanical properties of the composites were investigated.The results show that the interface of laminated composite produced by asymmetrical roll bonding is tightly bonded,and the diffusion transition layer is formed at copper/aluminum interface after annealing.The intermetallic compounds are largely generated and destroy the interfacial bonding when the annealing temperature was 350℃.During tensile test,cracks are initiated in the interfacial transition layer and propagate along the interface with low bonding strength.When the deformation compatibility between interface and matrix layers is poor,the bonding interface is severely separated.The copper/aluminum composite annealed at 300°C has good interfacial stability during high temperature tensile test,and the interface strengthening effect is obvious.The yield strength of laminated composite is 106.6 MPa,and the matrix layers in the tensile fracture maintain the interfacial bonding.
作者
李小兵
狄佳鹏
陈帅
杨立栋
LI Xiaobing;DI Jiapeng;CHEN Shuai;YANG Lidong(School of Metallurgy and Materials Engineering, Jiangsu University of Science and Technology, Zhangjiagang 215600, China;Zhangjiagang Industrial Technology Research Institute, Jiangsu University of Science and Technology, Zhangjiagang 215600, China)
出处
《江苏科技大学学报（自然科学版）》
CAS
2020年第4期19-24,共6页
Journal of Jiangsu University of Science and Technology:Natural Science Edition
基金
江苏省高校自然科学研究面上项目(16KJB430012)
江苏科技大学青年科技创新项目(2017JKDQN05)
江苏省高校大学生创新训练计划项目(201810289013Z)。
关键词
层状复合板
高温拉伸
复合界面
断裂
金属间化合物
laminated composites
tension at elevated temperature
bonding interface
fracture
intermetallic compounds
