Stability of nanotwins during plastic deformation is an important factor to control plasticity of nanotwinned metals. Based on transmission electron microscopy observations of the 25 nm Cu/Au multilayers deformed by indentation, we found that the nanotwins in the Cu and the Au layers have different stabilities through twinning/detwinning. The mechanism-based criterion for the stability of the nanotwins under applied stress proposed here reveals that the tunable twinning/detwinning ability is related to the residual stress in the nanolayered material. The present results may provide a clue for the modulation of plasticity of nanotwinned multilayers through the nanotwin stability. (C) 2013 AIP Publishing LLC.
[yan, j. w.
; zhang, g. p.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china.
; zhang, gp (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china.