Grain Boundary Migration and Grain Growth during Sintering and Annealing in Magnetic Field in Iron and Its Alloy

摘要

Carbonyl iron compacts were sintered under direct current (D.C.) magnetic field up to 15kOe in ferromagnetic region below the Curie temperature. The effects of magnetic field on densification and microstructural development during sintering were examined. Microstructural changes, particularly changes of the grain orientation distribution and the grain boundary character distributions (GBCD), during the magnetic sintering were observed using a FE-SEM/EBSP/OIM system. It was found that the application of magnetic field could enhance the densification and grain growth irrespective of the direction of magnetic field. The frequencies of low angle and low Σ coincidence boundaries were increased by the magnetic sintering. It was evidenced that the application of a magnetic field could enhance grain boundary migration in Fe-2.5%Si alloy bicrystals.