Creep behavior of extruded Al-6Mg-1Sc-1Zr-10Â vol.% SiCp composite

Creep tests were performed on a fine-grained Al-6Mg-1Sc-1Zr-10 vol.% SiC particulate composite in the temperature range of 423-533 K. The composite exhibited a high value of apparent stress exponent and apparent activation energy for creep at low temperatures. The flow behavior of this composite was characterized by the presence of a threshold stress. Incorporation of threshold stress into analysis reduces the high values of apparent stress exponent and activation energy to those anticipated from the creep of solid solution alloys. The result showed increased creep resistance in the composite compared to the unreinforced alloy.