The Effects of Hot Rolling on AA2124 15 v/o SiC Whisker Composites

Abstract

Mechanical and microstructural studies were performed on a rolled sheet of AA2124 15 volume percent SiC whisker composite. Tests were done in both the as-rolled condition and after a T6 heat treatment. It was confirmed that hot rolling significantly reduces the tensile strength of a heat treated composite and that a T6 heat treatment re stores this strength. It has been suggested by previous investigators that this reduction and recovery in tensile strength was due to the creation and healing of interfacial voids. How ever, the present study shows that the loss in strength is mainly due to simple overaging of the rolled composite which occurs during cooling. A T6 heat treatment restored the strength of the rolled composite by dissolving the large precipitates. The ductility of the composite was also increased significantly as a result of the heat treatment.

Keywords

Hot rolling aluminum 2124 metal matrix composite overaging pre cipitates.

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