SiCs
p, TiCs
p, ZrCs
p and TaCs
p composites were fabricated by a melt stirring process and the effect of species of carbides on mechanical properties were measured. The strength of SiCs
p/pure aluminum composite is higher than those of TiCs
p, ZrCs
p and TaCs
p/pure aluminum composites. The strength and the elongation of SiCs
p/Al-3mass%Mg alloy composite are lower than those of base-metal, because of the formation of reaction products and/or the clustering of particulates. On the other hand, in the case of TaCs
p composites, the reaction products can not be detected by either SEM or X-ray analysis. Isothermal treatments at 573K are found to have little effect on the strength of TiCs
p, ZrCs
p and TaCs
p composites, although the strength of SiCs
p composites decreases at an early stage of the treatment. However, the strength of composites fabricated by PM technology is unaffected by the isothermal treatments. ICP emission spectrometric analysis of decomposed metallic elements content in matrix indicates that the effect of isothermal treatment time on the decomposition of each composite is weak. TaCs
p composites show the stable property of strength even after isothermal treatments at 803K, though this temperature is not practically used for this material.
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