Abstract
Three samples, namely, iron (Fe) bulk, nanowire (NW) and nanotube (NT) with the initial body centered cubic (bcc) structure were designed and constructed. Using molecular dynamics simulation, tensile experiments were performed on the three samples. The results show that the NT exhibits the highest plasticity followed by the NW and bulk. Cyclical phase transitions were observed in the NW and NT, releasing the accumulated stress and allowing the samples to achieve the superplasticity. Focusing on nucleation and growth, the phase transitions were analyzed in detail and it could be concluded that the higher surface-volume ratio and the surface roughness induced by grain reorientation are the main reasons for the highest plasticity in the NT. In addition, the dislocation behaviors in the three samples were investigated. The results of this work might be helpful to understand the mechanism of phase transition induced superplasticity and provide some new ideas for the material design with high plasticity requirement.
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