The effect of rare earth element segregation on grain boundary energy and mobility in magnesium and ensuing texture weakening

摘要

AbstractThis paper elucidates a key puzzle related to texture randomization - effect of rare earth on grain boundaries. We use electron back-scatter diffraction and molecular dynamics to compare recrystallization between pure Mg and a Y-containing alloy. The alloy's texture components were initially similar, but the large ?a? fiber grains in pure Mg overtook all other components. Y segregation homogenized the energies of ?a? fiber grain boundaries, curtailing conventional recrystallization. Grain boundary mobilities were reduced proportionally to the energy stabilization, reducing the dominance of101ˉ0extrusion texture. This allows other grain orientations to stabilize thus producing a more randomized texture.Graphical abstractDisplay Omitted]]>