알루미늄 복합재의 주조접합 강도평가

초록

Aluminum alloy composites with SiC particles are useful for weight reduction of mechanical components. But they are expensive and it is difficult to make complex components. If we found out a reliable method to join aluminum alloys and Al/SiC composites, we could make complex mechanical parts at a low price. In this study A356 aluminum alloy and A356/SiC 20 vol.% composite were chosen as dissimilar materials. To join two different materials by casting, first, A356 blocks were cast and cylindrical holes with conical end were drilled in the blocks. A mold with a cylindrical hole was placed on an A356 cast block. Molten A356/SiC at about 750℃ was poured into the mold. Before pouring molten A356/SiC, A356 blocks were heated and kept at 550℃. Using the specimens tensile strength tests were carried out. As tensile forces increased, some composite bars were pulled out from the A395 blocks and others fractured near the border. Tensile strengths depended on the surface conditions of the cast-bonded joints.