Strain-rate-induced bcc-to-hcp phase transformation of Fe nanowires

HX Xie and T Yu and W Fang and FX Yin and DF Khan, CHINESE PHYSICS B, 25, 126201 (2016).

DOI: 10.1088/1674-1056/25/12/126201

Using molecular dynamics simulation method, the plastic deformation mechanism of Fe nanowires is studied by applying uniaxial tension along the 110 direction. The simulation result shows that the bcc-to-hcp martensitic phase transformation mechanism controls the plastic deformation of the nanowires at high strain rate or low temperature; however, the plastic deformation mechanism will transform into a dislocation nucleation mechanism at low strain rate and higher temperature. Furthermore, the underlying cause of why the bcc-to-hcp martensitic phase transition mechanism is related to high strain rate and low temperature is also carefully studied. Based on the present study, a strain rate-temperature plastic deformation map for Fe nanowires has been proposed.

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