Deformation and crack mechanisms of nanotwinned cadmium telluride under cyclic nanoindentations

Zhang, Zhenyu; Duan, Nengdong; Wang, Bo; Huo, Yanxia; Bi, Ziqiang; Zhang, Xianzhong; Ye, Fei

doi:10.1016/j.scriptamat.2014.08.018

Cited by 8 publications

(6 citation statements)

References 23 publications

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“…The increase in the indentation depth from 8.5 to 9.8 nm does not change the crack size and configuration, due to the formation of twins, leading to the release of stress. This is different from those published in previous literatures 13 , where cracks enlarge with an increase of indentation.…”

Section: Resultscontrasting

confidence: 99%

“…1(c) , and a small crack emerges at the bottom along the (-111) direction. This is consistent with previous reports 13 , in terms of the impediment of slips along (-111) orientation, induced by the fixed atomic layer at the bottom in MD model. In Fig.…”

Section: Resultssupporting

confidence: 94%

“…Both twin boundaries intersect within the inverse triangle, and the twin with the (-111) boundary terminates at the left side of the triangle. Furthermore, the lamellar twin with a thickness of 16 nm has a hardening effect, and the two twins of their respective thicknesses of 3.2 and 3.5 nm have a softening effect 2 8 13 . The inverse triangle consisting of a twin combining with three twins generate a synergistic strengthening effect with both hardening and softening functions, indicating the ultrahigh hardness exhibited in the experiment 8 .…”

Section: Discussionmentioning

confidence: 99%

“…The potential function of a single element metal could be usually found in the previous literatures, whereas that of an fcc ternary alloy is hard to be discovered in the previous reports, resulting in the scarceness of MD simulation for an fcc ternary alloy. The MD study on the ternary alloy with ultrahigh hardness and high ductility has not been reported 13 . Since the deformation twinning mechanism from a single crystal is not clear, an fcc binary single crystal is cracked under nanoindentation 13 , rather than forming twins from a single crystal.…”

mentioning

confidence: 99%

“…The MD study on the ternary alloy with ultrahigh hardness and high ductility has not been reported 13 . Since the deformation twinning mechanism from a single crystal is not clear, an fcc binary single crystal is cracked under nanoindentation 13 , rather than forming twins from a single crystal. Because of the difficulty to form twins from a single crystal, investigations of deformation ordinarily begin from an established nt structure 9 10 , instead of a single crystal.…”

mentioning

confidence: 99%

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Deformation twinning evolution from a single crystal in a face-centered-cubic ternary alloy

Zhang

Song

Guo

et al. 2015

Sci Rep

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Deformation twinning evolution from a single crystal is conducted by molecular dynamics simulations, to elucidate a twinned face-centered-cubic alloy in an experiment with hardness up to 100 times as that of single crystals, and with ductility simultaneously. Critical twinning stress of cadmium zinc telluride (CdZnTe or CZT) calculated is 1.38 GPa. All the twin boundaries are along the (11-1) orientation, except the one with the (-111) plane that supports the indentation, interpreting the unidirectional and boundary-free characteristics, confirmed in the experiment. Three twin thicknesses after unloading are 3.2, 3.5, and 16 nm, which is consistent with the experimentally repeated pattern of a lamellar twin with thickness larger than 12.7 nm, followed by one or several twins with thicknesses smaller than 12.7 nm. An inverse triangle of a twin combining with three twins generate a synergistic strengthening effect through the hardening and softening functions, illuminating the ultrahigh hardness demonstrated in the experiment. Twinning takes place in loading, and detwinning occurs in unloading, which expounds the high ductility observed in the experiment.

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Section: Resultscontrasting

confidence: 99%

Section: Resultssupporting

confidence: 94%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Deformation twinning evolution from a single crystal in a face-centered-cubic ternary alloy

Zhang

Song

Guo

et al. 2015

Sci Rep

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Hyper‐Elastic Deformation via Martensitic Phase Transformation in Cadmium Telluride

Luo,

Han,

Cappola

et al. 2024

Adv Eng Mater

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Cadmium telluride (CdTe) is a highly promising material for photovoltaics and photodetectors due to its light‐absorbing properties. However, efficient design and use of flexible devices require a deep understanding of its atomic‐level deformation mechanism. Here, we investigate uniaxial compression deformation of CdTe monocrystalline with varying crystal orientations using molecular dynamics (MD) with a newly developed machine‐learning force field, alongside in‐situ micropillar compression experiments. Our findings reveal that CdTe bulk deformation is dominated by reversible martensitic phase transformation, whereas CdTe pillar deformation is primarily driven by dislocation nucleation and movement. CdTe monocrystals possess exceptional super‐recoverable deformation along the <100> orientation due to hyper‐elastic processes induced by martensitic transformation. This discovery not only sheds light on the peculiarities observed in micropillar experimental measurements but also provides pivotal insights into the fundamental deformation behaviors of CdTe and similar II‐VI compounds under various stress conditions. These insights are crucial for the innovative design and enhanced functionality of future flexible electronic devices.This article is protected by copyright. All rights reserved.

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Anisotropic mechanical responses and plastic deformation mechanisms of cadmium telluride under indentations

Zhang

et al. 2022

Appl. Phys. A

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Deformation and crack mechanisms of nanotwinned cadmium telluride under cyclic nanoindentations

Cited by 8 publications

References 23 publications

Deformation twinning evolution from a single crystal in a face-centered-cubic ternary alloy

Deformation twinning evolution from a single crystal in a face-centered-cubic ternary alloy

Hyper‐Elastic Deformation via Martensitic Phase Transformation in Cadmium Telluride

Anisotropic mechanical responses and plastic deformation mechanisms of cadmium telluride under indentations

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