Effects of pre-strain on the nanoindentation behaviors of metallic glass studied by molecular dynamics simulations

Zhao, Dan; Zhu, Bo; Wang, Shunbo; Niu, Yihan; Xu, Linlin; Zhao, Hongwei

doi:10.1016/j.commatsci.2020.110073

Cited by 24 publications

(5 citation statements)

References 33 publications

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“…At low temperatures, the run-away of shear bands is dominated by the sluggish diffusion rate, thus the free volume accumulation is significant compared with that of free volume annihilation rate. Therefore, experimental and molecular dynamics simulations have shown that uncontrolled softening is the dominant mechanism during shear banding, as reported by several authors [ 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 75%

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

et al. 2021

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The effect of cold rolling on the evolution of hardness (H) and Young’s modulus (E) on the rolling-width (RW), normal-rolling (NR), and normal-width (NW) planes in Zr41.2Ti13.8Cu12.5Ni10Be22.5 (Vitreloy 1) bulk metallic glass (BMG) was investigated systematically using nanoindentation at peak loads in the range of 50 mN–500 mN. The hardness at specimen surface varied with cold rolling percentage (%) and the variation is similar on RW and NR planes at all the different peak loads, whereas the same is insignificant for the core region of the specimen on the NW plane. Three-dimensional (3D) optical surface profilometry studies on the NR plane suggest that the shear band spacing decreases and shear band offset height increases with the increase of cold rolling extent. Meanwhile, the number of the pop-in events during loading for all the planes reduces with the increase of cold rolling extent pointing to more homogeneous deformation upon rolling. Calorimetric studies were performed to correlate the net free volume content and hardness in the differently cold rolled specimens.

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Section: Introductionmentioning

confidence: 75%

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

et al. 2021

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“…Moreover, the orientation of preshear bands played a major role in the fnal mechanical properties. Using molecular dynamics (MD) simulation, Zhao et al [24] evaluated the infuence of prestress on the plasticity and mechanical properties of CuZr MGs under the indenting process. Teir results indicated that the morphologies of shear band were afected by the magnitude of prestress so that the catastrophic propagation of shear bands in the nanoindentation process was correlated to the large prestress values.…”

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

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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.

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“…For a metal with isotropic hardening, it is observed that a pre-strain leads to an increase in yield strength and a decrease in ductility. A pre-strain modifies other parameters such as decreasing the toughness and Young modulus of high strength steels [42] [43], hydrogen embrittlement [44], or the hardening or softening of glass, depending on the loading path [45]. Studying the indentation response of as-received and pre-strained materials is one way to evaluate the change in mechanical properties due to pre-strain [42] [43] [45] [46] [22].…”

Section: Introductionmentioning

confidence: 99%

Instrumented indentation for determining stress and strain levels of pre-strained DC01 sheets

Idriss

Bartier

Guines

et al. 2023

International Journal of Mechanical Sciences

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Effects of pre-strain on the nanoindentation behaviors of metallic glass studied by molecular dynamics simulations

Cited by 24 publications

References 33 publications

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

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

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

Instrumented indentation for determining stress and strain levels of pre-strained DC01 sheets

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