矿物冶金与材料学报
礦物冶金與材料學報
광물야금여재료학보
INTERNATIONAL JOURNAL OF MINERALS,METALLURGY AND MATERIALS
2015年
3期
309-318
,共10页
copper%aluminum%intermetallic compounds%oxide films%isothermal heating
The evolutionary process and intermetallic compounds of Cu/Al couples during isothermal heating at a constant bonding tem-perature of 550°C were investigated in this paper. The interfacial morphologies and microstructures were examined by optical microscopy, scanning electron microscopy equipped with energy dispersive X-ray spectroscopy, and X-ray diffraction. The results suggest that bonding is not achieved between Cu and Al at 550°C in 10 min due to undamaged oxide films. Upon increasing the bonding time from 15 to 25 min, however, metallurgical bonding is obtained in these samples, and the thickness of the reactive zone varies with holding time. In the interfacial region, the final microstructure consists of Cu9Al4, CuAl, CuAl2, andα-Al+CuAl2. Furthermore, these results provide new insights into the mechanism of the interfacial reaction between Cu and Al. Microhardness measurements show that the chemical composition exerts a signifi-cant influence on the mechanical properties of Cu/Al couples.
