Abstract
Nanotwins require little energy to form in metals, but their impact on strength and ductility is dramatic. New mechanisms of strengthening, strain hardening, ductility, and strainrate sensitivity have been observed in nanowires, films, and bulk materials containing nanoscale twins as the twin-boundary spacing decreases. These mechanisms can act in concert to produce interface-dominated nanomaterials with extreme tensile strength and plastic deformation without breaking. This article reviews recent theoretical and experimental understanding of the physical mechanisms of plasticity in nanotwin-strengthened metals, with a particular focus on the fundamental roles of coherent, incoherent, and defective twin boundaries in plastic deformation of bulk and small-scale cubic systems, and discusses new experimental methods for controlling these deformation mechanisms in nanotwinned metals and alloys.
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Acknowledgements
The authors acknowledge support from NSF Grants DMR-1410646 and DMR-1410331, the Ministry of Science and Technology of China (Grant No. 2012CB932201), the National Natural Science Foundation of China (Grants 51231006 and 51171182), the Key Research Program of the Chinese Academy of Sciences (Grant No. KGZD-EW-T06), and the DOE, Office of Basic Energy Sciences at Los Alamos National Laboratory.
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Sansoz, F., Lu, K., Zhu, T. et al. Strengthening and plasticity in nanotwinned metals. MRS Bulletin 41, 292–297 (2016). https://doi.org/10.1557/mrs.2016.60
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DOI: https://doi.org/10.1557/mrs.2016.60