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

CD Barrett and A Imandoust and H El Kadiri, SCRIPTA MATERIALIA, 146, 46-50 (2018).

DOI: 10.1016/j.scriptamat.2017.11.004

This 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 of < 1010 > extrusion texture. This allows other grain orientations to stabilize thus producing a more randomize texture. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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