| 초록 |
Metallic composites have been increasingly eliciting interest because they have material properties that are better than those of single metals. For example, Al/Cu clad materials are almost 50 % lighter than pure Al. The cost of Al/Cu clad is also 30% less than pure copper. These advantages make Al/Cu clad materials suitable in the fabrication of armored cables, TV yoke coils, and in Busbar-applications. Overlay welding, explosion welding, extrusion and rolling process are used for the fabrication of Al/Cu clad. Among extrusion processes, direct extrusion and indirect extrusion methods are conventionally used for fabrication of clad materials. Hydrostatic extrusion process is a non-conventional method that uses a large die angle, and high extrusion ratio and results in uniform metal flow because the specimen does not come in contact with the container during extrusion. It is possible to use hydrostatic extrusion to produce Al/Cu clad materials at lower temperatures than conventional extrusion. While there have been reports on the fabrication of Al/Cu clad materials by hydrostatic extrusion, there are few studies on their microstructure and mechanical properties. In this study, Al/Cu clad materials have been synthesized by the hydrostatic extrusion process and the microstructure, interface composition and cellular structure have been analyzed in detail. The mechanical properties of the clad materials after annealing have also been studied and their correlation to the interfacial microstructure has been made. |
