Author： Ma X.L. Xu W.Z. Zhou H. Moering J.A. Narayan J. Zhu Y.T.
Publisher： Taylor & Francis Ltd
E-ISSN： 1478-6443|95|3|301-310
ISSN： 1478-6443
Source： Philosophical Magazine, Vol.95, Iss.3, 2015-01, pp. : 301-310
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Abstract
Grain-size dependency of deformation twinning has been previously reported in nanocrystalline face-centred-cubic metals, which results in an optimum grain-size range for twin formation. Here, we report, for the first time in experiments, the observed optimum grain sizes for deformation twins in nanocrystalline Cu–Zn alloys which slightly increase with increasing Zn content. This result agrees with the reported trend but is much weaker than predicted by stacking-fault-energy based models. Our results indicate that alloying changes the relationship between the stacking-fault and twin-fault energy and therefore affects the optimum grain size for deformation twinning. These observations should be also applicable to other alloy systems.
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