Asymmetrical Precipitation on the {10-12} Twin Boundary in the Magnesium Alloy

摘要

Precipitation on deformation defects is essential for enhancing mechanical properties of age-hardenable alloys. In this work, we revealed how {10-12} twin boundary (TB) influences beta-Mg17Al12 precipitation in Mg-9Al-1Zn alloy. The precipitates on the TBs are rodlike, while others are lath shape. Most precipitates hold the Burgers orientation relationship (OR) only with twin or matrix. Moreover, certain precipitate variants are absent and a new rule for variant selection on TB is proposed. (C) The Minerals, Metals & Materials Society and ASM International 2018