冷轧复合AgNi10/Cu/Fe界面结合特征研究

Interface Characteristics of AgNi10/Cu/Fe by Cold Roll Bonding

摘要:

采用等辊径、等辊速冷轧复合技术制备了AgNi10/Cu/Fe三层复合材料，对其界面结合机制进行了研究。复合前对三层材料分别进行再结晶退火，获得均匀的原始组织及相近的硬度，并用钢丝刷清理复合面。利用扫描电镜和能谱仪对复合材料的剥离面进行了形貌观察和成分分析。结果发现，AgNi10/Cu/Fe的界面结合机制主要是裂口机制。各层复合面的硬化层在轧制时开裂，其中较软金属（AgNi10和Cu）从裂口中挤出，与硬金属（Cu和Fe）产生结合；其结合强度分别大于AgNi10和Cu的基体强度。

Abstract:

AgNi10/Cu/Fe layered composites were prepared by cold roll bonding with equal-roller-diameter and equal-rolling-speed. The interface bonding mechanism was investigated. The raw tapes of the AgNi10, Cu and Fe were singly annealed before bonding so as to obtain homogeneous recrystallized microstructures and similar hardness. The surfaces to be bonded were cleaned by a scratch brush just before entering the roll gap. After bonding, the peeled interfaces of the composites were analyzed by SEM and EDS. Results show that the bonding mechanism of the as-rolled interfaces is primarily cracking. During roll bonding, the work-hardened surface layers are fractured. Virgin metals of the softer layers (AgNi10 and Cu for AgNi10/Cu and Cu/Fe respectively) are extruded from the cracks and bonded with the harder ones (Cu and Fe). The bonding strength is greater than the fracture strength of AgNi10 and Cu in AgNi10/Cu and Cu/Fe.