为了从微观角度分析室温包覆拉拔铜包铝线双金属接合的机理,根据理论计算和实验结果相结合,分析得出：室温包覆拉拔铜包铝线的双金属结合是在施加于两个金属体的外力作用下,两个金属体表面的异类原子靠近至原子间相互作用势较低,能够相互交换电子、产生吸引力的距离,并且两个金属体表面的大量原子间的共同引力作用的结果。Cu-Al双金属固相结合前处于分离表面,在外力的作用下,塑性变形使金属表面贴近,在塑性变形时两表面凸凹的相互摩擦生热产生＂热激活＂使表面活化。包覆拉拔后在一定条件下双金属界面会发生原子间的相互扩散,扩散有利于提高结合强度,但不是结合的必要条件。
Bonding mechanism of two metals in copper clad aluminum bimetal wire fabricated by cold clad-drawing was investigated by theoretical calculation and experiments.The interatomic potential energy of the closer atoms of the two metal surfaces is lower to critical value so as to exchange electrons and attractive each other under the action of external force by the cold drawing.Plastic deformation by the cold clad-drawing leads to friction of the concavo-convex surfaces of the two metals causing heating activation of the surfaces.As a result,the atoms diffusion between the bimetallic interface occurs to increase its bonding strength.
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