Effects of twin orientation and twin boundary spacing on the plastic deformation behaviors in Ni nanowires
Effects of twin orientation and twin boundary spacing on the plastic deformation behaviors in Ni nanowires
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孪晶取向和孪晶界间距对镍纳米线塑性变形行为的影响
DOI：
10.1016/j.jmst.2022.06.049
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发表时间：
2022-08
影响因子：
10.9
通讯作者：
Wang Jianbo
中科院分区：
文献类型：
--
作者：
Zhang Ying;Hou Yuxuan;Zheng He;Zhao Ligong;Jia Shuangfeng;Li Kaixuan;Peng Huayu;Zhao Peili;Li Lei;Meng Weiwei;Jiang Renhui;Wang Jianbo
在面心立方（fcc）纳米金属中，孪晶的铺展被证明是一种有效的力学行为调节机制。然而，关于孪晶界在变形过程中作用的实验研究却鲜有报道。本文通过原位反常力学测试和理论研究的共同努力，系统地研究了拉伸加载方向（θ，拉伸加载方向与拉伸加载方向的夹角）和间距对Ni纳米线形变机制的影响。与单晶纳米线相比，θ = 0°的纳米孪晶纳米线具有有限的延展性，而TB能有效地阻止位错的传播.与此相反，在θ = 20°和55°的纳米线中，由TB-位错反应或部分位错运动引起的TB迁移/去孪晶占据了塑性的主导地位，这有助于提高纳米线的塑性。对于θ = 90°的纳米线，位错能够穿过TB，表明TB对纳米线拉伸性的影响有限。此外，减小TB间距（λ）可以促进退孪晶过程，从而大大提高θ <$55 ° NW的塑性。这项研究揭示了不同的作用，TB可以发挥在机械变形的面心立方纳米线，并提供了一个原子的观点到宏观力学性能和微观变形模式之间的直接联系。
Spreading twins throughout nano metals has been proved to effectively mediate the mechanical behaviors in face-centered-cubic (fcc) metals. However, the experimental investigation concerning the roles of twin boundary (TB) during deformation is rarely reported. Here, with the joint efforts ofin-situnanomechanical testing and theoretical studies, we provide a systematic investigation regarding the effects of TB orientation (θ, the angle between tensile loading direction and the normal of TB) and spacing on deformation mechanisms in Ni nanowires (NWs). As compared with single-crystalline counterparts, it is found that nano-twinned (nt) NWs withθ∼0° exhibit limited ductility, whereas TB can serve as an effective blockage to the dislocation propagation. In contrast, in nt NWs withθ∼20° and 55°, TB migration/detwinning induced by TB-dislocation reaction or partial dislocation movement dominates the plasticity, which contributes to enhanced NW ductility. Regarding nt NWs withθ∼90°, dislocations are found to be able to transmit through the TBs, suggesting the limited effect of TB on the NW stretchability. Furthermore, decreasing TB spacing (λ) can facilitate the detwinning process and thus greatly enhance the ductility of NW withθ∼55°. This study uncovers the distinct roles that TB can play during mechanical deformations in fcc NWs and provides an atomistic view into the direct linkage between macroscopic mechanical properties and microscopic deformation modes.
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