The competition between dislocation slip and deformation twinning in body-centered cubic (BCC) nanocrystals can be strongly influenced by the deformation conditions. In this study, we investigate the deformation of [112]-oriented BCC tungsten nanowires under different loading modes. It shows that dislocation plasticity is a predominant deformation mode under uniaxial tension, while deformation twinning prevails when non-uniaxial stress is applied. The interfaces of bending-induced twinning are composed of numerous stepwise {112} twin boundaries. These findings shed light on the deformation mechanism of BCC nanocrystals under complex loading conditions.

中文翻译：

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体心立方钨纳米线的弯曲诱导变形孪生

体心立方（BCC）纳米晶体中位错滑移和形变孪晶之间的竞争会受到形变条件的强烈影响。在这项研究中，我们调查[112]定向BCC钨纳米线在不同加载模式下的变形。结果表明，位错可塑性是单轴拉伸下的主要变形模式，而在施加非单轴应力时则以孪生变形为主。弯曲诱发孪晶的界面由众多的逐步{112}孪晶边界组成。这些发现揭示了复杂负载条件下BCC纳米晶体的变形机理。