Strong size effect on deformation twin-mediated plasticity in body-centered-cubic iron

Zhao, Ligong; Chen, Guoxujia; He, Zheng; Jia, Shuangfeng; Li, Kaixuan; Jiang, Renhui; Li, Lei; Zhang, Ying; Peng, Huayu; Zhao, Ping; Huang, Ziyang; Wang, Jianbo

doi:10.1016/j.jmst.2022.11.004

Cited by 12 publications

(3 citation statements)

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“…The stress reaches a peak at ε = 0.0629 (point A in Figure 2a), at which a twin embryo nucleates from the nanowire's surface (Snapshot A in Figure 2b). The twin embryo then expands to form complete twins (Snapshot B in Figure 2b), similar to that observed in the <001> tensile deformation of BCC Fe (Figure 2c) 62 and W 63 nanowires, thus confirming the validity of our results. During this process, the elastic energy is released and the internal stress is relaxed, resulting in a rapid drop in stress (points A and B in Figure 2a).…”

Section: Tension 321 Mechanical Response Under Tensionsupporting

confidence: 88%

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Tension–Compression Asymmetry of BCC NbMoTaW in High Entropy Alloy Nanowires

Pan,

Fu,

Duan

et al. 2024

ACS Appl. Nano Mater.

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In recent years, considerable research efforts have been directed toward addressing the room-temperature brittleness of BCC NbMoTaW refractory high entropy alloys (RHEAs). However, there has been limited investigation of the plastic deformation mechanism at room temperature. In this work, we utilized molecular dynamics simulation to investigate the mechanical behavior and atomistic plastic deformation mechanism of BCC NbMoTaW RHEA nanowires under uniaxial compression/tension. It showed that, under tension, the primary deformation mechanism of the nanowires involves the nucleation and growth of twins from the surface, while under compression, the deformation is predominantly attributed to dislocation slip and twinning, with the twins formed by the dissociation of screw dislocations, differing from the twin nucleation and growth under tension. Furthermore, the tension−compression asymmetry of the nanowires was discussed in detail, considering the atomic arrangement and energy barrier. This work contributes to a deeper understanding of the relationship between the deformation mechanism and mechanical response of NbMoTaW RHEAs, which is significant for their rational design and aerospace applications.

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Section: Tension 321 Mechanical Response Under Tensionsupporting

confidence: 88%

“…(b) Snapshots of microstructure corresponding to points A, B, C, and D in panel a, with atoms identified as BCC removed. (c) Twinning observed in the [001] tensile deformation of Fe nanowires …”

Section: Resultsmentioning

confidence: 99%

Tension–Compression Asymmetry of BCC NbMoTaW in High Entropy Alloy Nanowires

Pan,

Fu,

Duan

et al. 2024

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…BCC metallic nanostructures undergoing prevalent dislocation plasticity usually exhibit high yield strength but limited ductility due to their strong tendency to shear localization 12 , 17 , 21 – 23 . Recently, deformation twinning was observed to dominate the plastic deformation of sub-50-nm-diameter BCC nanocrystals under room temperature and low strain rate 24 , 25 . These studies suggest opportunities of harnessing the twinning-induced plasticity in BCC nanostructures toward high mechanical performance, and thus underscore the importance of atomic-scale understanding on twin nucleation and growth, which have relied almost exclusively on computer simulations 26 – 33 and theoretical models 34 , 35 to date.…”

Section: Introductionmentioning

confidence: 99%

Atomic-scale observation of nucleation- and growth-controlled deformation twinning in body-centered cubic nanocrystals

Zhong,

Zhang,

Wang

et al. 2024

Nat Commun

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Twinning is an essential mode of plastic deformation for achieving superior strength and ductility in metallic nanostructures. It has been generally believed that twinning-induced plasticity in body-centered cubic (BCC) metals is controlled by twin nucleation, but facilitated by rapid twin growth once the nucleation energy barrier is overcome. By performing in situ atomic-scale transmission electron microscopy straining experiments and atomistic simulations, we find that deformation twinning in BCC Ta nanocrystals larger than 15 nm in diameter proceeds by reluctant twin growth, resulting from slow advancement of twinning partials along the boundaries of finite-sized twin structures. In contrast, reluctant twin growth can be obviated by reducing the nanocrystal diameter to below 15 nm. As a result, the nucleated twin structure penetrates quickly through the cross section of nanocrystals, enabling fast twin growth via facile migration of twin boundaries leading to large uniform plastic deformation. The present work reveals a size-dependent transition in the nucleation- and growth-controlled twinning mechanism in BCC metals, and provides insights for exploiting twinning-induced plasticity and breaking strength-ductility limits in nanostructured BCC metals.

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Revealing the Structure/Property Relationships of Semiconductor Nanomaterials via Transmission Electron Microscopy

Zhao,

Cheng,

et al. 2024

Adv Funct Materials

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Transmission electron microscopy (TEM) offers unprecedent atomic resolution imaging and diverse characterizations capabilities, which has been proved to be effective in correlating the atomic structures and compositions with the physical/chemical properties of semiconductor nanomaterials. This review aims to provide an overview of the latest advancements regarding the atomic structure/property relationship in semiconductor nanomaterials. First, by employing off‐axis electron holography, a comprehensive overview of the quantitative investigations into the atomic‐electronic structure relationship of semiconductors is presented. Second, by integrating in situ TEM technique with micro/nanoelectromechanical systems (M/NEMS), this review summarizes the recent advancements achieved in elucidating the intricate relationship between structure and properties of nanomaterials subjected to diverse stimuli such as stress, thermal, and electric fields. Moreover, the impact of electron beam irradiation on the microstructure of semiconductor nanomaterials is discussed. Lastly, current challenges and future research opportunities are proposed along with their potential applications.

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Strong size effect on deformation twin-mediated plasticity in body-centered-cubic iron

Cited by 12 publications

References 53 publications

Tension–Compression Asymmetry of BCC NbMoTaW in High Entropy Alloy Nanowires

Tension–Compression Asymmetry of BCC NbMoTaW in High Entropy Alloy Nanowires

Atomic-scale observation of nucleation- and growth-controlled deformation twinning in body-centered cubic nanocrystals

Revealing the Structure/Property Relationships of Semiconductor Nanomaterials via Transmission Electron Microscopy

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