Precipitate sheared by low-angle grain boundary in Mg-Al alloys

CL Xu and MY Zhang and XB Tian and WT Jiang and QY Wang and HD Fan, SCRIPTA MATERIALIA, 227, 115283 (2023).

DOI: 10.1016/j.scriptamat.2023.115283

The interaction between Mg17Al12 precipitate and low-angle grain boundaries (LAGBs) in Mg-Al alloys was studied using molecular dynamics (MD) simulations. The precipitate was observed to be not sheared by the LAGBs with a small rotation angle < 8 degrees, but sheared by the LAGBs with a large rotation angle >= 9 degrees To explain these two different interaction styles, a critical GB shear was proposed analytically using the Eshelby theory, which indicates that the critical GB rotation angle is 8.4 degrees and agrees well with the current MD simulations. The critical GB shear was found to be related to the aspect ratio of precipitate.

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