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Interface Driven Pseudo‐Elasticity in a‐Fe Nanowires
Author(s) -
Yang Yang,
Li Suzhi,
Ding Xiangdong,
Sun Jun,
Salje Ekhard K. H.
Publication year - 2016
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201504085
Subject(s) - materials science , bent molecular geometry , nanowire , elasticity (physics) , nucleation , nanoscopic scale , elastic energy , molecular dynamics , energy minimization , surface energy , bending , surface finish , surface roughness , nanotechnology , condensed matter physics , composite material , chemical physics , thermodynamics , computational chemistry , chemistry , physics
Molecular dynamics simulations of bent [100] α‐Fe nanowires show the nucleation of twins and nanoscale interfaces that lead to pseudo‐elasticity during loading/unloading cycles. The new type of interfaces along {110} stems from the accumulation of individual <111>/{112} twin boundaries and stores high interfacial energies. These nonconventional interfaces provide a large part of the driving force for shape recovery upon unloading, while the minimization of surface energy is no longer the dominant driving force. This new pseudo‐elastic effect is not much affected by surface roughness, and can be extended over a wide range of wire diameters, if the sample is seeded with conventional twin boundaries, which will transform to the desired {110} interfaces under bending.