SiCウィスカ強化Al合金の耐キャビテーション・***ージョン性に及ぼすマトリックス材料の影響

概要

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Cavitation erosion tests were carried out for SiC-whisker-reinforced aluminum composites and their base metal using a vibratory apparatus. The matrix metals were pure aluminum and three aluminum alloys (A6061, A2024 and A7075). The volume fraction of whisker was about 20 percent for all composites. Erosion behaviors were discussed based on the measurements of mass loss, eroded surface profiles, and the distribution of erosion particles. The erosion resistance of composites is markedly higher than that of base metal and the increase is more effective for the matrix with lower hardness. This is because erosion particles become smaller and crack growth is prevented by the presence of whiskers, resulting in a low rate of particle removal. The effect of heat treatment was also studied for the A2024 base metal and the composite. The erosion resistance of the base metal sharply increased with an increase in hardness by the heat treatment. However, heat treatment did not improve the erosion resistance of the composite, because it did not eliminate defects at the tips of whiskers and did not effectively increase the hardness of matrix due to the presence of whiskers. Macroscopically, the erosion resistance increases with H_B^2/E (H_B : Brinell hardness and E : Young's modulus) of the composites, but remains constant in the case of heat-treated composites.
社団法人日本機械学会の論文
1994-09-25