Abstract
By means of classical molecular-dynamics simulations we investigate the solid–solid phasetransition from a bcc to a close-packed crystal structure in cylindrical iron nanowires,induced by axial strain. The interatomic potential employed has been shown to be capableof describing the martensite–austenite phase transition in iron. We study thestress versus strain curves for different temperatures and show that for a range oftemperatures it is possible to induce a solid–solid phase transition by axial strain beforethe elasticity is lost; these transition temperatures are below the bulk transitiontemperature. The two phases have different (non-linear) elastic behavior: thebcc phase softens, while the close-packed phase stiffens with temperature. Wealso consider the reversibility of the transformation in the elastic regimes, andthe role of the strain rate on the critical strain necessary for phase transition.
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