Abstract
Phase transformation from hexagonal close-packed (HCP) to face-centered cubic (FCC) does not occur in plastic deformation of pure magnesium. In this work, a reversible HCP → FCC phase transformation was observed at basal/prismatic twin boundary (TB) of 101¯2 twinning mode, in atomistic simulations of TB migration in pure magnesium. The FCC phase was induced by a local misfit strain between the parent and the twin. When an FCC phase was formed at the basal/prismatic TB, the TB migration was temporarily hindered. As the strain increased, the FCC transformed to the HCP twin by atomic shuffling. The orientation relationship between the FCC and the HCP parent satisfies 111FCC||101¯0HCP. During transformation, a double-layered prismatic plane was transformed into a 111FCC close-packed plane of the FCC by shear and shuffle. The energy barriers for the reversible phase transformation was calculated.
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