SiC whisker reinforced aluminum alloy composites with whisker volume fraction (
Vf) ranging from 0 to 40% were fabricated by a powder metallurgical method. In a low
Vf range, the ultimate tensile strength increases proportionally with the increase of
Vf and agrees satisfactorily with the value calculated from Kelly and Tyson's equation. In a high
Vf range, however, the increasing rate of strength becomes smaller than the theoretical value due to the decrease in ductility of composites. This deviation from the proportional line takes place at a lower
Vf and the decrease in strength is also observed in higher strength aluminum alloy matrix composites. At elevated temperatures, the tensile strength follows the proportional relationship with the
Vf to a higher
Vf range due to the improvement in ductility. The elastic modulus increases as the
Vf increases and is in good agreement with the value calculated from Cox's equation, assuming that the elastic modulus of whiskers is 43, 000kgf/mm
2. The whisker orientation factors of three dimensional random array composites for the strength and the elastic modulus are determined experimentally as 0.38 and 0.68, respectively.
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