Deformation behavior and strengthening mechanism of CuTa/CuTa amorphous/amorphous nanomultilayers

Doan, Dinh-Quan; Fang, Te‐Hua; Tran, Thi-Bao-Tien

doi:10.1016/j.jnoncrysol.2022.121993

Cited by 8 publications

(3 citation statements)

References 65 publications

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“…As shown in Figure 11 , stress concentration preferentially occurs at the A/A interfaces due to the high free volume of the A/A interfaces [ 63 , 64 ]. When the stress concentration reaches a certain level, STZs are activated [ 50 , 65 ]. These STZs will continue to diffuse along the direction of maximum shear stress within the constituent layers until reaching the next A/A interfaces.…”

Section: Resultsmentioning

confidence: 99%

“…Since the size of the grains and the thickness of the interfacial phase of nanoglass are difficult to adjust in the experiments of inert-gas condensation, a bottom-up method has been used to accurately control the A/A composites. A widely used bottom-up technique is magnetron sputtering (physical vapor deposition), which alternatively stacks nanoscale amorphous layers of different materials or compositions to form the designed composites [ 50 , 51 , 52 , 53 , 54 ]. For example, Sharma et al [ 44 ] prepared a Zr 55 Al 10 Cu 30 Ni 5 /La 55 Al 25 Ni 10 Cu 5 Co 5 nanolayered glass (NLGs) with an individual layer thickness ( h ) of 200 nm by alternatively depositing the Zr-based and La-based amorphous targets in the magnetron sputtering system.…”

Section: Introductionmentioning

confidence: 99%

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Quantifying the Size-Dependent Shear Banding Behavior in High-Entropy Alloy-Based Nanolayered Glass

Dai,

Zhang,

et al. 2024

Nanomaterials

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Extensive research has shown that nanolayered structures are capable of suppressing the shear banding in metallic glass in nanoindentation experiments. However, the specific mode and mechanism of the shear banding underneath the indenter remains unknown. Also, the quantification of shear banding-induced strain localization is still a challenge. Herein, the size-dependent shear banding behavior of a CuTiZrNb high-entropy alloy-based nanolayered glass with individual layer thicknesses (h) ranging from 5 to 80 nm was systematically investigated by nanoindentation tests. It was found that the hardness of the designed structure was almost size-independent. Yet, a clear transition in the deformation modes from the cutting-like shear bands to the kinking-like ones was discovered as h decreased to 10 nm. Moreover, multiple secondary shear bands also appeared, in addition to the primary ones, in the sample with h = 10 nm. The transition leads to an obvious strain delocalization, as clearly illustrated by the proposed theoretical model, which is based on the assumption of a pure shear stress state to quantify the shear banding-induced strain localization. The strain delocalization results from the higher density of amorphous/amorphous interfaces that exhibit the change in morphology with a refined layered glass structure.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quantifying the Size-Dependent Shear Banding Behavior in High-Entropy Alloy-Based Nanolayered Glass

Dai,

Zhang,

et al. 2024

Nanomaterials

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“…The following equation establishes the local stress distribution on the substrate for von Mises stress [23,34,35]:…”

Section: Methodologiesmentioning

confidence: 99%

Effects of grain boundary and gradient structure on machining property of CoCrFeMnNi alloys

Lu,

Bui,

Fang

2024

Modelling Simul. Mater. Sci. Eng.

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CoCrFeMnNi high-entropy alloy (HEA) has a high degree of thermodynamic stability and excellent ductility, making it a crucial structural material. However, the plastic deformation and microstructural behavior of gradient grain structured CoCrFeMnNi HEA under cutting remain unclear. In this study, the machining properties of gradient nanostructured CoCrFeMnNi HEA under conventional cutting were investigated by molecular dynamics (MD) simulation. The results displayed that the small grain gradient samples exhibited grain size softening. The shear angle and cutting ratio increased with the increase in the grain gradient. The grain boundaries of the low grain gradient samples were damaged and slid during the cutting process. Moreover, the dislocation density increased with the increasing grain gradient. The multi-dislocation nodes and the Lomer-Cottrell junction were produced in the grain coarsening gradient samples, contributing to work hardening. The cutting forces from low to high cutting velocities were 136.70, 147.91, 165.82, and 164.79 nN, which confirmed that the cutting forces increased with increased cutting velocity. This work elucidated the cutting mechanism of the nanostructured CoCrFeMnNi HEA and highlighted the influence of the gradient grain sizes.

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Revealing the toughening mechanisms in graphene/tungsten nanocomposites with hierarchical nacre-like structures

Ding

et al. 2023

Composite Structures

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Deformation behavior and strengthening mechanism of CuTa/CuTa amorphous/amorphous nanomultilayers

Cited by 8 publications

References 65 publications

Quantifying the Size-Dependent Shear Banding Behavior in High-Entropy Alloy-Based Nanolayered Glass

Quantifying the Size-Dependent Shear Banding Behavior in High-Entropy Alloy-Based Nanolayered Glass

Effects of grain boundary and gradient structure on machining property of CoCrFeMnNi alloys

Revealing the toughening mechanisms in graphene/tungsten nanocomposites with hierarchical nacre-like structures

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