铜/铝复合板交叉轧制高强度结合机理研究

Research on High-strength Bonding Mechanism of Cu/Al Clad Plates by Cross-rolling Process

采用扫描电镜、拉伸试验机和有限元仿真软件等研究了两道次非交叉轧制复合和交叉轧制复合工艺对铜/铝双金属复合板界面结合性能和微观结构的影响。结果表明,采用交叉轧制比非交叉轧制更有利于提升复合板的剪切强度和复合板整体结合性能的稳定性。这是因为交叉轧制过程中界面处形成了十字网状粘铝形貌,轧后复合板的剪切强度达到了61.52 MPa。而非交叉轧制的复合板界面则为条带状粘铝形貌,复合板的剪切强度仅为46.89 MPa。与此同时,交叉轧制过程中界面层的等效应变沿宽度方向分布更加均匀,有效抑制了边部剪切强度突降的现象。

The effects of two pass non-cross rolling process and cross rolling process on the interfacial bonding properties and microstructure of Cu/Al bimetallic clad plates were studied by SEM,material stretch test machine and finite element simulation software.The results show that,the cross rolling process is more beneficial to improve the shear strength and the stability of the overall bonding properties of the clad plate than that of non-cross rolling process.This is because the cross network Al ridges are formed at the interface during cross rolling,and the shear strength of the clad plate after rolling reaches 61.52 MPa.However,the interface of the clad plate with non-cross rolling process is adhered by strip-shaped sticky Al ridges,and the shear strength of the clad plate is only 46.89 MPa.Meanwhile,the equivalent strain of the interface layer is more evenly distributed along the width direction during cross rolling,which effectively suppresses the sudden drop of the shear strength at the edge of the clad plate.