Ni3Al基複合材料の高温引張特性に及ぼすアルミナ形状の影響

概要

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Al2O3 fiber and/or particle reinforced Ni3At matrix composites were produced by elemental powder metallurgy, The high temperature tensile properties of the composites were investigated in the connection with microstructures. The results were summaried as follows; The distribution of short Al2O3 fiber in Ni3Al matrix was more uniform than that of long Al2O3 fiber. The grain growth of matrices in the composites was suppressed by adding A1203 particles. The yield strength of every composites increased with increasing temperature to the peak temperature about 800K and then it degraded abruptly above that temperature. The complex addition of both short fiber and particle was the most effective to improve high temperature tensile properties.