분말피복압연법에 의해 제조된 Al/Al2O3 복합재료의 가공열처리후의 기계적 성질 및 집합조직

Abstract

The Al/Al2O3 composites fabricated by powder in sheath rolling method were cold-rolled by 50% reduction and annealed for 1.8 ks at various temperatures ranging from 200 to 500℃, for improvement of the mechanical properties. The mechanical properties and texture of the composites after rolling and annealing were investigated. The tensile strength of the composites increased significantly due to work hardening after cold rolling, however it decreased due to restoration after annealing. The strength of the composites was improved by thermomechanical treatment. On the other hand, the texture evolution with annealing temperatures was different between the unreinforced material and the composites. The unreinforced material showed a deformation (rolling) texture of which main component is {112}<111> at annealing temperatures up to 300℃. However, the composites have already exhibited a recrystallization texture of which main component is {001}<100> after annealing at 200℃. This proves that the critical temperature for recrystallization is lower in the composites than in the unreinforced ones.