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.
journal_name
Sci Advjournal_title
Science advancesauthors
Wang J,Zeng Z,Wen M,Wang Q,Chen D,Zhang Y,Wang P,Wang H,Zhang Z,Mao SX,Zhu Tdoi
10.1126/sciadv.aay2792subject
Has Abstractpub_date
2020-06-03 00:00:00pages
eaay2792issue
23issn
2375-2548pii
aay2792journal_volume
6pub_type
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