Effect of grain size on the competition between twinning and detwinning in nanocrystalline metals

Ni, S., Wang, Y., Liao, X., Li, H., Figueiredo, R., Ringer, S., Langdon, T. and Zhu, Y. (2011) Effect of grain size on the competition between twinning and detwinning in nanocrystalline metals. Physical Review B, 84 (23), 235401-[4pp]. (doi:10.1103/PhysRevB.84.235401).

Abstract

Both twinning and detwinning have been reported to occur during the deformation of nanocrystalline (nc) face-centered-cubic metals. This raises the issue of how these two processes compete with each other. Here, we report that the twinning process dominates in a certain range of grain sizes, whereas, the detwinning process dominates outside of this range to annihilate all twins. These experimental observations establish a full spectrum of grain-size effects on deformation twinning and detwinning and are explained by the deformation physics. They also provide a fundamental basis for understanding and designing the mechanical behavior of nc metals and alloys

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Contributors

Author: T. Langdon

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