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报导了一种在纯铜基体上通过表面机械研磨和表面机械合金化共同作用原位合成Cu-Ni复合涂层的方法。采用XRD、OM、SEM、GDS对处理不同时间的样品进行组织及成分分析。结果表明,经过表面机械研磨预处理合金化4 h样品的表面涂层均匀、致密,且厚度达到40μm。涂层的形成主要经历了3个阶段:粉体与基体机械结合、形成冷焊层和互扩散过程。在弹丸与基体材料不断碰撞时,局部迅速升温,降低了原子扩散的势垒;通过预处理引入缺陷,使扩散通道增多,促进了元素扩散。
A method of in-situ synthesis of Cu-Ni composite coatings on pure copper substrates by surface mechanical grinding and surface mechanical alloying is reported. XRD, OM, SEM and GDS were used to analyze the microstructure and composition of the samples treated at different times. The results show that the surface coating prepared by surface mechanical grinding pretreatment for 4 h samples is uniform and dense, and the thickness reaches 40μm. The formation of the coating has mainly gone through three stages: powder and the matrix mechanical combination to form a cold solder layer and mutual diffusion process. When the projectile collides with the matrix material, the local temperature rapidly increases, reducing the barrier of atomic diffusion. By introducing defects into the projectile, the diffusion channels are increased and the element diffusion is promoted.