Notch strengthening in nanoscale metallic glasses

Zhang, Sha; Teng, Yun; Poh, Leong Hien; Pei, Qing‐Xiang; Xing, Guichuan; Gao, Huajian

doi:10.1016/j.actamat.2019.02.044

Cited by 42 publications

(8 citation statements)

References 42 publications

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“…cavities and notches. It has been proved that these cavities and notches are closely related to the deformation behavior of the glass solids (Chen and Dai, 2016;Pan et al, 2015;Sha et al, 2019;Singh et al, 2013). On the other hand, the current analysis is applicable only in the case of homogeneous deformation.…”

Section: Discussionmentioning

confidence: 89%

A hierarchically correlated flow defect model for metallic glass: Universal understanding of stress relaxation and creep

Hao

Lyu

Pineda

et al. 2022

International Journal of Plasticity

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Section: Discussionmentioning

confidence: 89%

A hierarchically correlated flow defect model for metallic glass: Universal understanding of stress relaxation and creep

Hao

Lyu

Pineda

et al. 2022

International Journal of Plasticity

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“…Previously, some works reported that the change of notch depth may affect the fracture mode or alter the deformation mechanism from a shear banding state to a mixed mode with a sudden necking event. 27,55 Figure 8 illustrates the stress-strain curves of Cu 54 Zr 46 MG with different notch depths along with the strain snapshots captured at a certain strain value. According to the results, the ultimate strength with notch depths of 2, 4, and 8 nm is 2.81 GPa, 3.11 GPa, and 3.91 GPa, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Pan et al 26 prepared the notched amorphous rods and induced structural rejuvenation under a tri-axial compression at room temperature and revealed that the MG sample exhibited exceptionally efficient strain-hardening under the compressive load. Using molecular dynamics (MD) simulation, sha et al 27 investigated the geometry of notch on the mechanical properties of MGs and unveiled that the symmetric double-edge notched MGs led to a notch strengthening effect, especially with the increase of notch depth or sharpness. The MD simulation also indicated that the notch shape of MGs induced the formation of dense atomic arrangements in the notch-affected zone, leading to the extension of the deformation area and the improvement of strengthening effects in the amorphous alloy.…”

Section: Introductionmentioning

confidence: 99%

The effects of alloying composition on plasticity and strength of notched metallic glasses

Jasim

ISMAILOV

Opulencia

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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Using notch geometry in the metallic glass (MG) samples, it is possible to improve the homogeneous plasticity and mechanical properties. In this work, the molecular dynamics (MD) simulation was performed to indicate how the alloying composition of MGs can tune the mechanical properties of notched samples. For this purpose, CuZr MGs were constructed through atomic-scale simulation with alloying compositions of Cu64Zr36, Cu60Zr40, Cu54Zr46, and Cu50Zr50, while a symmetrical surface notch was produced at the waistline of samples by removing certain atoms and relaxing the new free surfaces. The tensile loading was also carried out to characterize the plastic deformation and strength in the CuZr MGs. According to the results, Cu64Zr36 and Cu60Zr40 alloys exhibited a localized plastic deformation in the notch region, while the decrease in Cu content, i.e. Cu54Zr46, led to the generation of nanoscale shear events outside the notch region and extended the deformation area in the body of the sample. The results also indicated that the change in the mechanism of plastic deformation in the notched samples strongly depended on the type and population of polyhedrons rearranged in the backbone structure. Moreover, it was found that the Voronoi volume in the Cu54Zr46 alloy exhibited a gentle increment under the tensile loading in both the notched and un-notched regions, while the Cu-rich MGs, i.e. Cu64Zr36 and Cu60Zr40, showed a sudden increment of Voronoi volume at the center of the notch region, which was indicative of strain localization in the atomic system.

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“…For uniaxial tension tests, PBCs are imposed along all three dimensions. Tension deformation at a rate of 1 × 10 8 s −1 is applied along the x-direction, and the system temperature is held at 300 K [ 35 ]. The pressure in the y- and z-directions is kept at zero using the constant number, pressure, and temperature (NPT) ensemble, allowing for lateral expansion.…”

Section: Methodsmentioning

confidence: 99%

Influence of the Hydrogen Doping Method on the Atomic Structure, Mechanical Properties and Relaxation Behaviors of Metallic Glasses

2023

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The interaction of metallic glasses (MGs) with hydrogen can trigger many interesting physical, chemical and mechanical phenomena. However, atomic-scale understanding is still lacking. In this work, molecular dynamics (MD) simulations are employed to study the atomic structure, mechanical properties and relaxation behaviors of H-doped Ni50Al50 MGs doped by two methods. The properties of H-doped MGs are determined not only by the hydrogen content but also by the doping method. When H atoms are doped into the molten state of samples, H atoms can fully diffuse and interact with metallic atoms, resulting in loose local atomic structures, homogeneous deformation and enhanced β relaxation. In contrast, when H atoms are doped into as-cast MGs, the H content is crucial in affecting the atomic structure and mechanical properties. A small number of H atoms has little influence on the elastic matrix, while the percolation of shear transformation zones (STZs) is hindered by H atoms, resulting in the delay of shear band (SB) formation and an insignificant change in the strength. However, a large number of H atoms can make the elastic matrix loose, leading to the decrease in strength and the transition of the deformation mode from SB to homogeneous deformation. The H effects on the elastic matrix and flow units are also applied to the dynamic relaxation. The deformability of H-doped Ni50Al50 MGs is enhanced by both H-doping methods; however, our results reveal that the mechanisms are different.

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Notch strengthening in nanoscale metallic glasses

Cited by 42 publications

References 42 publications

A hierarchically correlated flow defect model for metallic glass: Universal understanding of stress relaxation and creep

A hierarchically correlated flow defect model for metallic glass: Universal understanding of stress relaxation and creep

The effects of alloying composition on plasticity and strength of notched metallic glasses

Influence of the Hydrogen Doping Method on the Atomic Structure, Mechanical Properties and Relaxation Behaviors of Metallic Glasses

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