Ultrahigh hardness and synergistic mechanism of a nanotwinned structure of cadmium zinc telluride

Zhang, Zhenyu; Huo, Yanxia; Huo, Fengwei; Zhang, Xianzhong; Zhang, Liang; Guo, Dongming

doi:10.1016/j.scriptamat.2013.01.004

Cited by 22 publications

(20 citation statements)

References 29 publications

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“…1b) and nt 5.6-17.9-7.8-5.6 ( Fig. 1c) models exhibit primarily elastic characteristics, and loading-unloading curves after the third cycle are similar between each other, which is consistent with the experimental reports [7][8][9]. Figure 3b, and a triangular crack 12.1 nm long appears at the lower TB initiated at the junction point between the slip {1 1 1} planes and the lower TB.…”

supporting

confidence: 84%

“…This means that when k >16, the hardening effect of nt-CT dominates, but when k <16, the softening effect prevails. According to experimental results [7][8][9], nt-CZT and nt-MCT show a repeating pattern, consisting of a twin showing the hardening effect followed by one or several twin lamellae, which exhibit ultrahigh hardness and high ductility. As a result, both nt-CT include a hardening twin with k >16 nm.…”

mentioning

confidence: 99%

“…Both CZT and MCT showed higher hardness up to 100 times that for their monocrystalline counterparts, while remaining their ductility, which was evidenced by performing 100 cyclic nanoindentations without crack formation [7][8][9]. Therefore, it is necessary to explore the fundamental mechanism of ductility for nt semiconductors, under cyclic loading conditions.…”

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confidence: 99%

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Deformation and crack mechanisms of nanotwinned cadmium telluride under cyclic nanoindentations

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Deformation and crack mechanisms of nanotwinned cadmium telluride under cyclic nanoindentations

et al. 2014

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“…Moreover, the nanostructures of CdZnTe single crystals have been studied by various techniques such as electron diffraction, HREM and energy dispersive X-ray analysis [9]. Furthermore, nanotwinned CdZnTe which shows ultrahigh hardness and high ductility was fabricated using quasi-static plastic deformation under nanoindentation at room temperature [10]. Recently, air-stable Cd 0.23 Zn 0.77 Te nanostructure thin films were synthesized by inert gas condensation technique to study the effect of the particle size on the controlling the structural, optical and electronic properties [11].…”

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confidence: 99%

Mechanical properties of CdZnTe nanowires under uniaxial stretching and compression: A molecular dynamics simulation study

Kurban

Erkoç

2016

Computational Materials Science

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“…As the extension of stacking faults, twin activities are highly related to partial dislocation activities. Moreover, studies revealed that the induced twins can enhance mechanical performances such as strength 88,89 , hardness 90,91 , fracture toughness 88,89 and anti-fatigue 92 .…”

Section: And Twins and Grain Boundariesmentioning

confidence: 99%

In-situ nanoscale TEM observation of cooperative deformation mechanisms in nanocrystalline-Au films

Li¹

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Grain boundaries activities are important for the deformation of nanocrystalline metals.Studies revealed that deformation mechanisms of nanocrystalline metals switch from dislocation-mediated regime to grain-boundary-mediated regime as approaching the "strongest" grain size. Basically, stress-driven grain growth, grain rotation and grain boundary sliding have been widely studied and discussed in the aspect of grain-boundary-mediated deformation mechanisms in nanocrystalline metals. Based on the previous studies, these grain-boundarymediated deformation mechanisms could perform in either individual forms or cooperative forms. However, limited studies have been focused on the cooperative form mechanisms for the grain-boundary-mediated deformation mechanism, especially for the cooperative grain boundary sliding mechanisms which could lead to more ductile performance than the pure grain boundary sliding. Particularly, only a few molecular dynamic simulation studies and theoretical prediction studies investigated the cooperative grain boundary sliding mechanism in nanocrystalline metals. Therefore, it is necessary to practically examine the true deformation behaviours in straining nanocrystalline metals.In this MPhil project, with utilising the homemade tensile device equipped with a transmission electron microscopy heating holder, in-situ transmission electron microscopy tensile tests are conducted for the magnetic-sputtering-fabricated nanocrystalline Au thin films (thickness ~ 15nm, average grain size ~ 16nm). In the in-situ experiments, the dynamic crack propagation processes of strained nanocrystalline Au films are clearly recorded under nanoscale bright-field TEM mode. It has been found that grain boundary sliding and stress-driven grain boundary migration are prevalent during the deformation processes. As cooperative deformation mechanism, stress-driven grain boundary migration assisted grain boundary sliding is confirmed experimentally. It is also found that cooperative grain boundary sliding mechanism

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Ultrahigh hardness and synergistic mechanism of a nanotwinned structure of cadmium zinc telluride

Cited by 22 publications

References 29 publications

Deformation and crack mechanisms of nanotwinned cadmium telluride under cyclic nanoindentations

Deformation and crack mechanisms of nanotwinned cadmium telluride under cyclic nanoindentations

Mechanical properties of CdZnTe nanowires under uniaxial stretching and compression: A molecular dynamics simulation study

In-situ nanoscale TEM observation of cooperative deformation mechanisms in nanocrystalline-Au films

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