Journal
SCIENCE ADVANCES
Volume 6, Issue 23, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aay2792
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Funding
- National Natural Science Foundation of China [11725210]
- Innovation Fund of the Zhejiang Kechuang New Materials Research Institute [ZKN-18-Z02]
- U.S. National Science Foundation [DMR-1410331]
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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) over bar(1) over bar(1) over bar > 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.
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