SiCウィスカ強化アルミニウム複合押出し成形品の強度に及ぼす粉末粒度および熱処理の影響

抄録

For each matrix powder size, the tensile strength of composite increased proportionally with increasing volume fraction of the whisker, V_f, up to a critical value, (V_f)_c, beyond which the strength was holded. (V_f)_c increased with decreasing powder size. Thus, the composite produced with finer matrix powder was effectively strengthened by the whisker up to higher V_f. The amount of whisker per unit surface area of matrix powder calculated for each size of powder at (V_f)_c coincided approximately with each other. The specific amount of whisker was considered to be a limitation to effectively reinforce the matrix. As for the effect of heat treatment on the strength of composite, it was 20% increased by heating at 913 K for about 30ks. On the other hand, the prolonged heat treatment reduced the strength by causing remarkable reaction between the whisker and the matrix.