Strain rate sensitivity of a Cu60Zr40 metallic and nanoglass

Sharma, A.; Hirmukhe, S.S.; Nandam, Sree Harsha; Hahn, Horst; Singh, I.; Narayan, Ranjani; Prasad, K. Eswar

doi:10.1016/j.jallcom.2022.165991

Cited by 7 publications

(2 citation statements)

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“…Another effective strategy is to develop various amorphous alloys with high density of nanoscale A/A interfaces by taking advantage of the size-dependent plasticity of MGs [ 12 , 16 , 18 , 23 , 39 , 40 , 41 , 42 ]. A typical amorphous material with nanoscale A/A interfaces is nanoglass [ 16 , 18 , 39 , 40 , 43 , 44 , 45 , 46 ], the microstructure of which is similar to that of nano-grained metals. However, the grain interior and boundary of the latter are replaced by the same amorphous phases but with different elemental contents.…”

Section: Introductionmentioning

confidence: 99%

“…However, the grain interior and boundary of the latter are replaced by the same amorphous phases but with different elemental contents. Many experiments and atomic simulations have shown that the plasticity of nanoglass materials can be substantially improved due to the nanoscale A/A interfaces [ 15 , 16 , 23 , 39 , 40 , 41 , 46 , 47 ]. For example, Wang et al [ 48 ] produced a Sc 75 Fe 25 nanoglass by the inert-gas condensation technique, which possessed nano-grains with a diameter of 10 nm and glassy interfacial regions with a thickness of 1 nm.…”

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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