분말시스압연법에 의해 제조된 Al/Al2O3 복합재료의 기계적 성질

Abstract

The powder-in sheath rolling was applied to the fabrication of Al/Al2O3 composite. A stainless steel tube with outer diameter of 12 mm and wall thickness of 1 mm was used as a sheath. Mixture of aluminum powder and Al2O3 particles of which volume content was varied from 5 to 20 vol.% was filled in the tube by tap filling and then rolled to 75% reduction at ambient temperature. The rolled specimen was sintered at 560℃ for 0.5 hr. The Al/Al2O3 composite fabricated by the sheath rolling and subsequent sintering showed the relative density higher than 0.96. The tensile strength of the composite increased with the volume content of Al2O3 particles, and it reached a maximum of 90 MPa which is 1.5 times higher than unreinforced material. The elongation decreased with the volume content of Al2O3 particles. It is concluded that the powder-in sheath rolling is an effective method for fabrication of Al/Al2O3 composite.