3-DIMENSIONAL MICROSTRUCTURE OF AL-AL_3TI ALLOY SEVERELY DEFORMED BY ECAP

摘要

Microstructure of Al-Al_3Ti alloy deformed by Equal-Channel-Angular Pressing (ECAP) is 3-dimensionally investigated. Especially, distribution of Al_3Ti particles is focused in this study. The Al-Al_3Ti alloy has coarse Al_3Ti platelet particles in α-Al matrix. When the Al-Al_3Ti alloy is deformed by ECAP under route A, fine Al_3Ti platelet particles are observed. These Al_3Ti platelet particles are aligned along to deformation axis, and its plane normal is perpendicular to the deformation axis. On the other hand, Al-Al_3Ti alloy ECAPed under route Bc forms several groups consisted of fine Al_3Ti platelet particles. Moreover, longitudinal size of the Al_3Ti particle groups is close to that of initial Al_3Ti particles with 4-pass ECAP specimen. These distribution behaviors of the Al_3Ti particle can be explained by plastic flow of α-Al matrix. Finally, it is concluded that distribution of Al_3Ti particle in Al-Al_3Ti alloy by ECAP is controlled by plastic deformation of α-Al matrix.