Atomistic migration mechanisms of 1210 symmetric tilt grain boundaries in magnesium

CL Xu and XB Tian and WT Jiang and QY Wang and HD Fan, INTERNATIONAL JOURNAL OF PLASTICITY, 156, 103362 (2022).

DOI: 10.1016/j.ijplas.2022.103362

Grain boundary (GB) is an important microstructure and plays a vital role in the mechanical properties of polycrystalline materials by GB migration and sliding. In this work, molecular dynamic (MD) simulations were performed to investigate the migration mechanisms of 1210 symmetric tilt grain boundaries (STGBs) in magnesium. A total of 15 STGBs with the rotation angle theta from 0 degrees to 90 degrees were studied under a pure shear loading. The results show that the GB migration mechanisms are significantly influenced by the GB structure. For small angle STGBs (theta < 28 degrees), the GB migration is mediated by twin nucleation from GB and subsequent twin growth. For large angle STGBs (theta > 83 degrees), the GB migration is achieved by the glide of GB dislocations. The medium angle STGBs (28 degrees

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