Abstract
Microstructural evolution of Al-Al_3Ti multi-phase material by equal-channel-angular pressing (ECAP) is 3-dimenstionally investigated. The Al-Al3Ti multi-phase materials have Al_3Ti platelet particles in Al matrix. Especially, the distribution changes of the Al3Ti particles with ECAP are focused in this study. The Al_3Ti platelet particles are fragmented by ECAP under all of processing routes. When the Al-Al_3Ti specimen is deformed by ECAP under route A, the fine Al3Ti particles are homogeneously distributed along to deformation axis and the plane normal of the Al_3Ti particles are aligned perpendicular to deformation axis. On the other hand, the Al_3Ti particles in the specimens deformed under route Bc and route C are gathered and form several groups. Moreover, orientation distribution of the Al_3Ti particles in the specimen deformed under route Bc is random, and the Al_3Ti particles in the ECAPed sample under route C are aligned. The differences of the Al_3Ti particle distribution depending on the processing routes comes from shear deformation mechanism and plastic flow of the A1 matrix. Furthermore, it is found that fragmentation of the Al_3Ti particles by ECAP are preferentially occurred on (112)_<A13Ti>.
