Abstract
Prismatic precipitate plates in an age hardenable Mg–Ca–In alloy are characterized by atomic-resolution high-angle annular dark-field scanning transmission electron microscopy. The precipitate phase, designated δ, has a monoclinic structure. The proposed crystal structure of the δ is supported by first-principles calculations and multi-slice image simulations. The δ plates form with a considerably large dilatational strain in the direction perpendicular to their habit plane, and this strain is accommodated elastically.
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