In situ atomic-scale observation of twinning-dominated deformation in nanoscale body-centred cubic tungsten

Nature Materials
Jiang Wei WangScott X Mao

Abstract

Twinning is a fundamental deformation mode that competes against dislocation slip in crystalline solids. In metallic nanostructures, plastic deformation requires higher stresses than those needed in their bulk counterparts, resulting in the 'smaller is stronger' phenomenon. Such high stresses are thought to favour twinning over dislocation slip. Deformation twinning has been well documented in face-centred cubic (FCC) nanoscale crystals. However, it remains unexplored in body-centred cubic (BCC) nanoscale crystals. Here, by using in situ high-resolution transmission electron microscopy and atomistic simulations, we show that twinning is the dominant deformation mechanism in nanoscale crystals of BCC tungsten. Such deformation twinning is pseudoelastic, manifested through reversible detwinning during unloading. We find that the competition between twinning and dislocation slip can be mediated by loading orientation, which is attributed to the competing nucleation mechanism of defects in nanoscale BCC crystals. Our work provides direct observations of deformation twinning as well as new insights into the deformation mechanism in BCC nanostructures.

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Citations

Nov 17, 2015·Nano Letters·Junhang LuoScott X Mao
May 13, 2015·Nano Letters·Sankar NarayananTing Zhu
Mar 30, 2016·Chemical Society Reviews·Qi ZhangTianyou Zhai
Jun 20, 2018·Physical Chemistry Chemical Physics : PCCP·Ya-Xin FengYue Chen
Jul 3, 2018·Advanced Materials·Dan MordehaiRoman Kositski
Apr 4, 2019·Nanoscale·Mayank SinhaSara Roccabianca
May 20, 2020·Nature Communications·Xiang WangScott X Mao
Sep 7, 2018·Nature Communications·A P RooneyS J Haigh
Jun 27, 2019·Nanoscale·Jiangwei WangFrederic Sansoz
Oct 9, 2019·Nature Communications·Yulong DuanTheo Rasing
Jun 17, 2020·Science Advances·Jiangwei WangTing Zhu
Jan 13, 2019·Nature Communications·Qi ZhuScott X Mao
Aug 18, 2018·Physical Review Letters·X Wendy GuA Paul Alivisatos
Nov 3, 2020·Nanoscale·Elizabeth R HopperEmilie Ringe
Feb 17, 2021·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·Supriya KoulAkihiro Kushima
May 26, 2018·Ultramicroscopy·Mingjie XuXiaoqing Pan
Nov 14, 2017·ACS Nano·Lihua WangXiaodong Han
Nov 18, 2017·The Journal of Physical Chemistry Letters·Jingshan S DuDavid A Weitz

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