【摘要】 在易氧化的纯Al表面制备Cu/Cr合金熔覆层 ,因二者的熔点温度差别大且容易在结合过渡区产生脆性裂纹而有一定难度。本文通过扫描电镜 (SEM)分析研究了激光工艺参数对Cu/Cr熔覆层过渡区裂纹倾向的影响。实验结果表明 ,以 1 0 6 μm波长的Nd :YAG激光器的聚焦光束为热源 ,通过选择合适的激光工艺参数 ,可获得理想的Cu/Cr合金熔覆层 ,这对于改进铝材表面的物理、化学性能并进一步开发其作为电接触材料具有应用价值更多还原

【Abstract】 The laser cladding Cu/Cr alloy layers on commercial pure aluminum AA6061 which exposed to the atmosphere rapidly oxidizes,it is hardly to deal with since their melting points are quite different and the cracks are easily induced in the bound zone of cladding layers.This paper investigated the influences of laser process parameters on cracking trend in the bound zone by means of scanning electron microscope (SEM).The results indicate:the Cu/Cr cladding layers with pores and crack free can be prepared on Al substrates by the focusing Nd:YAG laser beam as a heating source under suitable laser process parameters,which is very useful to improve the surface properties of aluminum and furthermore to spread the applied values of aluminum as the electronic contacts.更多还原