성형압의 변화가 상용 2xxx Al 합금계 혼합분말의 소결특성에 미치는 영향

Abstract

The characteristics of two commercial 2xxx series Al alloy powders, AMB2712 and 201AB, were evaluated and their compacting and sintering characteristics were discussed in terms of compacting pressure. The particle shapes of both two powder mixtures were irregular and their particle size distributions were broad. The compactibility of AMB2712 was superior to that of 201AB because of better fluidity. The sintered density was higher than the green density at low compacting pressure, however, it was lower than the green density when the samples were compacted at higher pressure due to the swelling during sintering. The sintered density was almost the same as the green density at the "homogeneous deformation" stage. It was observed that the pores were created at the triple points due to the rapid diffusion of Cu in Al.