10(1)over-bar2 twinning nucleation in magnesium assisted by alternative sweeping of partial dislocations via an intermediate precursor
Z Zhang and JH Peng and JA Huang and P Guo and Z Liu and SC Song and Y Wang, JOURNAL OF MAGNESIUM AND ALLOYS, 8, 1102-1108 (2020).
Molecular dynamic simulation and transmission electron microscopy (TEM) characterization was employed to investigate the 10 (1) over bar2 twinning mechanism in magnesium. A partial dislocation assisted twinning nucleation mechanism was proposed based on simulation results, in which the twin lattice was reconstructed from parental matrix by two-step sweeping of partial dislocations on different close packed planes from matrix and the subsequently formed twin precursor respectively. A 10 (1) over bar2 twin precursor was observed adjacent to matrix/twin interface by a spherical aberration corrected TEM, which indicated the hexagonal-close-packed (hcp) matrix -> quasi face-centered cubic (fcc) twinning precursor -> h.c.p twin transformation sequence during 10 (1) over bar2 twinning process. (C) 2020 Published by Elsevier B.V. on behalf of Chongqing University.
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