Anti-twinning in nanoscale tungsten

Science Advances
Jiangwei WangTing Zhu

Abstract

Nanomaterials often surprise us with unexpected phenomena. Here, we report a discovery of the anti-twinning deformation, previously thought impossible, in nanoscale body-centered cubic (BCC) tungsten crystals. By conducting in situ transmission electron microscopy nanomechanical testing, we observed the nucleation and growth of anti-twins in tungsten nanowires with diameters less than about 20 nm. During anti-twinning, a shear displacement of 1/3〈111〉 occurs on every successive {112} plane, in contrast to an opposite shear displacement of 1 / 6 〈 1 ¯ 1 ¯ 1 ¯ 〉 by ordinary twinning. This asymmetry in the atomic-scale shear pathway leads to a much higher resistance to anti-twinning than ordinary twinning. However, anti-twinning can become active in nanosized BCC crystals under ultrahigh stresses, due to the limited number of plastic shear carriers in small crystal volumes. Our finding of the anti-twinning phenomenon has implications for harnessing unconventional deformation mechanisms to achieve high mechanical preformation by nanomaterials.

References

Oct 28, 1996·Physical Review Letters·J P PerdewM Ernzerhof
Sep 13, 2008·Proceedings of the National Academy of Sciences of the United States of America·Christopher R Weinberger, Wei Cai
Sep 5, 2013·Journal of Physics. Condensed Matter : an Institute of Physics Journal·M-C MarinicaF Willaime

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Methods Mentioned

BETA
transmission electron microscopy
electron diffraction

Software Mentioned

Vienna Ab initio Simulation Package
LAMMPS

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