Pseudoelastic behavior of Cu–Ni composite nanowires

Mastorakos, Ioannis N.; Zbib, Hussein M.; Bahr, David F.; Parsons, Jessica; Faisal, Mased
January 2009
Applied Physics Letters;1/26/2009, Vol. 94 Issue 4, pN.PAG
Academic Journal
We investigate the pseudoelastic behavior at room temperature of composite nanowires using molecular dynamics simulations. The nanowires are composed of a nickel core surrounded by a copper shell, leading to high coherency stresses. The coherency and surface stresses cause the nanowires to undergo a lattice reorientation, by twinning, from <001> to <110> during relaxation. Nanowires of different cross-sectional areas (varying from 2.17×2.17 up to 2.9×2.9 nm2) were studied. In all cases, under tensile loading, the nanowires reorient to <001> and then under unloading reorient back to <110>, thus exhibiting pseudoelastic behavior. This behavior is more pronounced in composite nanowires with a coherent interface than for single crystal nanowires.


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