Cu元素在二元等原子比合金中的扩散现象

Diffusion phenomena of Cu in binary alloys with equal atomic ratio

研究了Cu50Ni50、Cu50Co50、Fe50Ni50、Fe50Cr504种二元等原子比合金在镀铜并经850℃×10 h扩散处理后扩散层的显微组织及成分分布。结果表明,经过850℃×10 h扩散处理后,在Cu50Ni50等原子比合金中,由于适配空位的存在,Ni元素与Cu元素之间发生了明显的互扩散,并且Cu元素往往在晶界处发生互扩散;在Cu-Fe50Ni50扩散偶中,Cu元素和Fe元素之间发生了互扩散;但是在Cu-Fe50Cr50和Cu-Cu50Co50扩散偶中,各个元素均没有发生扩散。

Microstructure and composition distribution of diffusion layer of four binary equal atomic alloys,Cu50Ni50,Cu50Co50,Fe50Ni50 and Fe50Cr50,after copper plating and diffusion at 850℃for 10 h,were studied.The results show that after diffusion treatment at 850℃for10 h,there is obvious mutual diffusion between Ni atom and Cu atom due to the existence of suitable vacancies in Cu50Ni50alloy,and the mutual diffusion between Cu atom and Fe atom often occurs at grain boundary.In the diffusion couple of Cu-Fe50Ni50,there is mutual diffusion between Cu atom and Fe atom.In Cu-Fe50Cr50 and Cu-Cu50Co50 diffusion couple,no atoms diffuse.