Surface and interface controlled yielding and plasticity in fivefold twinned Ag nanowires

摘要: Abstract Molecular dynamics simulations are used to investigate the influences of pre-existing microstructural defects on strength and deformation mechanisms in Ag nanowires under both uniaxial nanoindentation. In particular, synergistic effects from internal external structural defects, including twin boundaries, surface facets, a special groove, studied. It is found that yielding modes vary among when different microstructures present. Furthermore, while fivefold boundaries cause significant strain hardening nanoindentation, they can either decrease or increase initial yield stress deformation. The addition, will result damping behavior nanowire leads peculiar oscillating load–displacement responses