{10■2} twinning nucleation in magnesium assisted by alternative sweeping of partial dislocations via an intermediate precursor

作者：Zhen Zhang; Jin-Hua Peng; Ji'an Huang; Peng Guo; Zhao Liu; Shi-Chao Song; Yu Wang^*

来源：Journal of Magnesium and Alloys, 2020, (04): 1102-1108.

Molecular dynamic simulation and transmission electron microscopy(TEM) characterization was employed to investigate the {10 ■ 2} 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 ■ 2 } 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 ■ 2} twinning process.

• 单位
  合肥工业大学; 中国科学院; 中国科学技术大学