Strain Rate Induced Amorphization in Metallic Nanowires
نویسندگان
چکیده
Using molecular dynamics simulations with a many-body force field, we studied the deformation of metal alloy nanowires subjected to various strain rates. For all strain rates, the Ni nanowire is elastic up to of 7.5% strain with a yield stress of 5.5 GPa, far above that of bulk Ni. At high strain rates, the crystalline phase transforms continuously to an amorphous phase, exhibiting a dramatic change in atomic short-range order. The amorphization transition is associated with the vanishing of the tetragonal shear elastic constant perpendicular to the tensile direction. PACS: 61.43.Dq, 68.35.Rh, 62.20.Fe, 64.70.Pf * To whom correspondence should be addresses (Email: [email protected]) † Current address: Department of Mechanical Engineering, Kagoshima National College of Technology, Kagoshima 899-5193, Japan. @ Current address : Institut fuer Physik, Universitaet Augsburg, D 86135 Augsburg, Germany.
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