Molecular dynamic simulation and transmission electron microscopy(TEM)characterization was employed to investigate the{1012}twinning mechanism in magnesium.A partial dislocation assisted twinning nucleation mechanism ...Molecular dynamic simulation and transmission electron microscopy(TEM)characterization was employed to investigate the{1012}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{101^(-)2}twin precursor was observed adjacent to matrix/twin interface by a spherical aberration corrected TEM,which indicated the hexagonal-close-packed(hep)matrix-quasi face-centered cubic(fee)twinning precursorsh.c.p twin transformation sequence during{101^(-)2}twinning process.展开更多
基金the National Natural Science Foundation of China(No.51871084 and No.51401072)the Fundamental Research Funds for the Central Universities JZ2019HGTB0072.
文摘Molecular dynamic simulation and transmission electron microscopy(TEM)characterization was employed to investigate the{1012}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{101^(-)2}twin precursor was observed adjacent to matrix/twin interface by a spherical aberration corrected TEM,which indicated the hexagonal-close-packed(hep)matrix-quasi face-centered cubic(fee)twinning precursorsh.c.p twin transformation sequence during{101^(-)2}twinning process.