Effect of Cold Rolling on the Evolution of Shear Bands and Nanoindentation Hardness in Zr41.2Ti13.8Cu12.5Ni10Be22.5 Bulk Metallic Glass

Gunti, Abhilash; Jana, Parijat P.; Lee, Min Ha; Das, J.

doi:10.3390/nano11071670

Cited by 10 publications

(3 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When h further decreases to 10 nm, three kinking-like primary SBs appeared, accompanied by multiple secondary SBs. A large number of nano/microindentation experiments have validated that the reduction in the number of SBs corresponds to the reduction in the shear instability of the sample under a complex stress state [ 21 , 43 , 55 , 61 , 62 ]. In addition, the shear instability of the cutting-like SBs is generally greater than that of the kinking-like SBs [ 21 , 61 ].…”

Section: Resultsmentioning

confidence: 99%

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

Dai,

Zhang,

et al. 2024

Nanomaterials

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 99%

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

Dai,

Zhang,

et al. 2024

Nanomaterials

View full text Add to dashboard Cite

show abstract

“…Recently, many investigations have been conducted to mitigate the brittle behavior of MGs through the formation and interaction of multiple shear bands in the microstructure [11][12][13][14]. Although, a single shear band changes to a crack due to the severe strain localization, the multiple shear banding extends plastic deformation in the bulk of specimen [15][16][17][18]. Ebner et al [19] indicated that the high pressure torsion (HPT) induced the extra shear strains in the amorphous structure, leading to improvement of plastic defamation.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Plastic Deformation in CuZr Metallic Glasses Subjected to the Rolling Process

Sivaraman

Altalbawy

Wais³

et al. 2023

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

Using the rolling process, it is possible to induce multiple shear bands in the microstructure of metallic glasses (MGs) and improve the overall plasticity in the subsequent mechanical loadings. Hence, it is crucial to understand the mechanism of shear banding and plastic deformation under the rolling process. In this work, molecular dynamics (MD) simulation was applied to evaluate the formation and generation of shear bands in a CuZr MG under cold- and hot-rolling processes. Based on the results, it is found that the shear bands are formed with secondary branches in the cold rolling, while the shear events are scattered in the bulk of material in the hot rolling. Considering Voronoi analysis, it is revealed that the hot rolling is accompanied by the recovery of crystalline-like clusters provided that rolling process continues for subsequent passes. On the other hand, the cold-rolled sample shows a stable behavior in the evolution of crystalline-like clusters; however, the population of main icosahedral polyhedrons decreases in the system.

show abstract

“…Although the deformation mechanisms of the gradient metals have been studied extensively [20][21][22][23][24], it is still not fully understood how the nano-grained (NG) layer at the surface of the gradient materials deforms during tension, especially considering that homogeneous NG metals usually have very limited ductility [25,26] and often fail through the formation of shear bands [27][28][29] that are initiated at a very small plastic strain, e.g., 0.3% [30], similar to the failure mechanism of brittle metallic glasses [31][32][33]. Recently, experiments showed that the NG layer in the gradient metals does not deform uniformly under tension as suggested in the previous studies [6,34].…”

Section: Introductionmentioning

confidence: 99%

Modelling the Shear Banding in Gradient Nano-Grained Metals

Chen

2021

Nanomaterials

View full text Add to dashboard Cite

Extensive experiments have shown that gradient nano-grained metals have outstanding synergy of strength and ductility. However, the deformation mechanisms of gradient metals are still not fully understood due to their complicated gradient microstructure. One of the difficulties is the accurate description of the deformation of the nanocrystalline surface layer of the gradient metals. Recent experiments with a closer inspection into the surface morphology of the gradient metals reported that shear bands (strain localization) occur at the surface of the materials even under a very small, applied strain, which is in contrast to previously suggested uniform deformation. Here, a dislocation density-based computational model is developed to investigate the shear band evolution in gradient Cu to overcome the above difficulty and to clarify the above debate. The Voronoi polygon is used to establish the irregular grain structure, which has a gradual increase in grain size from the material surface to the interior. It was found that the shear band occurs at a small applied strain in the surface region of the gradient structure, and multiple shear bands are gradually formed with increasing applied load. The early appearance of shear banding and the formation of abundant shear bands resulted from the constraint of the coarse-grained interior. The number of shear bands and the uniform elongation of the gradient material were positively related, both of which increased with decreasing grain size distribution index and gradient layer thickness or increasing surface grain size. The findings are in good agreement with recent experimental observations in terms of stress-strain responses and shear band evolution. We conclude that the enhanced ductility of gradient metals originated from the gradient deformation-induced stable shear band evolution during tension.

show abstract

Effect of Cold Rolling on the Evolution of Shear Bands and Nanoindentation Hardness in Zr41.2Ti13.8Cu12.5Ni10Be22.5 Bulk Metallic Glass

Cited by 10 publications

References 57 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

Characterization of Plastic Deformation in CuZr Metallic Glasses Subjected to the Rolling Process

Modelling the Shear Banding in Gradient Nano-Grained Metals

Contact Info

Product

Resources

About