Deformation mechanisms and twin boundary effects in cadmium telluride under nanoindentation

Qian, Xiang; Peng, Xianghe; Yang, Hang; Xiang, Henggao; Huang, Cheng; Yang, Bo; Yue, Xing; Fu, Tao

doi:10.1016/j.ceramint.2017.07.210

Cited by 6 publications

(2 citation statements)

References 43 publications

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“…Tian et al [10] uncovered that the gradient twinning structure endows the steel with a combination of high tensile strength and notable ductility. In additionally, the experiments and calculations indicate that the TB and twinning thickness play a significant part in governing the mechanical behaviors of various materials [11,12]. The above work is mainly about the effects of TB on the plastic behavior of conventional materials.…”

Section: Introductionmentioning

confidence: 99%

Atomic insight into nanoindentation response of nanotwinned FeCoCrNiCu high entropy alloys

Tian,

Fang,

Chen

et al. 2024

Modelling Simul. Mater. Sci. Eng.

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FeCoCrNiCu High-entropy alloys (HEAs) exhibit extraordinary mechanical properties and have the capability to withstand extreme temperatures and pressures. Their exceptional attributes make them suitable for diverse applications, from aerospace to chemical industry. We employ atomic-scale simulations to explore the effects of twinning boundary and twinning thickness on the mechanical behavior of nanotwinned FeCoCrNiCu during nanoindentation. The findings suggest that as the twinning thickness decreases within the range of 19.3 Å to 28.9 Å, both twinning partial slips and horizontal twinning partial slips gradually become dominant in governing the plastic behaviors of the nanotwinned FeCoCrNiCu, thereby resulting in an inverse Hall-Petch effect. Remarkably, when the twinning thickness is compressed below 19.3 Å, a shift in the plastic deformation mechanism emerges, triggering the conventional Hall-Petch relation. The observed Hall-Petch behavior in nanotwinned FeCoCrNiCu is attributed to the strengthening effect imparted by the twinning boundaries. Consequently, the twinning boundary play an instrumental role in steering the plastic deformation mechanism of the nanotwinned FeCoCrNiCu when the twinning thickness descends beneath 19.3 Å. This study contributes significant insights towards the design of next-generation high-performance HEAs, underpinning their potential industrial utilization.

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Section: Introductionmentioning

confidence: 99%

Atomic insight into nanoindentation response of nanotwinned FeCoCrNiCu high entropy alloys

Tian,

Fang,

Chen

et al. 2024

Modelling Simul. Mater. Sci. Eng.

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“…They also investigated the deformation and crack mechanisms of monocrystalline and nano-twinned CdTe [33]. Xiang et al [34] studied the effect of in-plane anisotropy and TBs on the softening and strengthening of CdTe via MD simulation of the nano-indentation process. They found that the indenter direction affects the plastic deformation and dislocation behavior of CdTe films, causing different softening/hardening effects.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on the Effects of Grain Size and Grinding Depth on Nano-Grinding of Cadmium Telluride Using Molecular Dynamics Simulation

Liu,

Yip,

et al. 2023

Nanomaterials

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Cadmium telluride (CdTe) is known as an important semiconductor material with favorable physical properties. However, as a soft-brittle material, the fabrication of high-quality surfaces on CdTe is quite challenging. To improve the fundamental understanding of the nanoscale deformation mechanisms of CdTe, in this paper, MD simulation was performed to explore the nano-grinding process of CdTe with consideration of the effects of grain size and grinding depth. The simulation results indicate that during nano-grinding, the dominant grinding mechanism could switch from elastic deformation to ploughing, and then cutting as the grinding depth increases. It was observed that the critical relative grain sharpness (RGS) for the transition from ploughing to cutting is greatly influenced by the grain size. Furthermore, as the grinding depth increases, the dominant subsurface damage mechanism could switch from surface friction into slip motion along the <110> directions. Meanwhile, as the grain size increases, less friction-induced damage is generated in the subsurface workpiece, and more dislocations are formed near the machined groove. Moreover, regardless of the grain size, it was observed that the generation of dislocation is more apparent as the dominant grinding mechanism becomes ploughing and cutting.

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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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Deformation mechanisms and twin boundary effects in cadmium telluride under nanoindentation

Cited by 6 publications

References 43 publications

Atomic insight into nanoindentation response of nanotwinned FeCoCrNiCu high entropy alloys

Atomic insight into nanoindentation response of nanotwinned FeCoCrNiCu high entropy alloys

Numerical Investigation on the Effects of Grain Size and Grinding Depth on Nano-Grinding of Cadmium Telluride Using Molecular Dynamics Simulation

Hyper‐Elastic Deformation via Martensitic Phase Transformation in Cadmium Telluride

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