Control of shear band formation in metallic glasses through introducing nanoscale pores

Lu, Xiaoqian; Li, L.; Zhang, Y.H.; Li, Z.J.; Feng, Shidong; Wang, L.M.; Liu, R.P.

doi:10.1016/j.jnoncrysol.2021.120994

Cited by 9 publications

(3 citation statements)

References 45 publications

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“…An effective tactic for enhancing the deformation ability of amorphous alloys is introducing nanopores, i.e., generating nanoporous amorphous alloys (NPAAs). 28,29 The nanopores can inhibit the propagation of mono shear bands and improve the ductility of amorphous alloys. On the other hand, ligaments in NPAAs have nanoscale sizes and exhibit incomparable plasticity.…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics simulations of cold welding of nanoporous amorphous alloys: effects of welding conditions and microstructures

Zhang,

Su,

et al. 2022

Phys. Chem. Chem. Phys.

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Section: Introductionmentioning

confidence: 99%

Molecular dynamics simulations of cold welding of nanoporous amorphous alloys: effects of welding conditions and microstructures

Zhang,

Su,

et al. 2022

Phys. Chem. Chem. Phys.

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“…However, catastrophic failure at ambient temperature by forming penetrating shear bands limits their applications in structural and functional materials [8][9][10]. Although numerous strategies have been proposed to improve the ductility of MGs, brittle fracture is still a significant problem [11][12][13][14][15][16][17][18]. The energy of MGs is metastable and can be adjusted by external conditions, such as aging and rejuvenation.…”

Section: Introductionmentioning

confidence: 99%

Severe deformation-induced microstructural heterogeneities in Cu₆₄Zr₃₆ metallic glass

Lu¹,

Feng²,

Li³

et al. 2022

Modelling Simul. Mater. Sci. Eng.

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Deformation-induced rejuvenation is a promising strategy to improve the macroscopic plasticity of metallic glasses (MGs). Here, molecular dynamics simulations are performed to investigate the rejuvenated MGs' atomic structure and mechanical behavior with high-pressure torsion (HPT) processing. The HPT induces the formation of soft and hard regions in MGs, which dramatically improves the microstructural heterogeneity. Potential energy, pair distribution function, short-range order, medium-range order, and vibrational behavior in HPT-deformed MGs are characterized. The microstructure of soft regions similar to the configuration slightly above the glass transition temperature can be adjusted by torsion angle, ultimately controlling the transformation of MGs from brittleness to ductility. These findings provide valuable guidelines for the design of MGs with enhanced deformability.

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“…e effect of embedded pores in the atomic configuration is also one of the main issues in the shock response of MGs. Due to the nanoscale size of pores, the molecular dynamics (MD) simulation has been an efficient method for evaluating the plastic deformation and mechanical properties of porous MGs [17][18][19][20][21]. Using MD simulation, Demaske et al [22] showed that the mechanism of plastic deformation in the shocked MG is based on the nucleation and growth of shear transformation zones (STZs) around the pores, accompanied with the softening event at the vicinity of pores owing to a regional temperature increment.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Temperature and Impact Velocity on the Shock Wave Response of Pore-Embedded Metallic Glasses

Patra

Abdulhadi

Fahim³

et al. 2022

Advances in Materials Science and Engineering

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In this work, the shock wave response of a pore-embedded CuZr metallic glass (PEMG) under different impact velocities (0.5–1.5 km/s) and initial temperatures (300–600 K) was evaluated through the molecular dynamics (MD) simulation. The results indicated that the nucleation and growth of nanoscale shear events around the pore were the dominant mechanisms for plastic deformation under the shock wave. It was also found that the increase in the impact velocity led to the filling of pore, which was due to the structural softening and the local temperature increment in the vicinity of pore. Moreover, the spall event originated from the formation and coalescence of tension transformation zones, leading to the formation of nanovoids in the system. At higher velocities, the spallation was accompanied with the formation of more nanovoids with smaller sizes, inducing the brittle failure in the system. The MD outcomes also showed that the increase in initial temperature decreased the shock pressure and flow shear stress and led to the smoother spallation in the PEMG.

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Control of shear band formation in metallic glasses through introducing nanoscale pores

Cited by 9 publications

References 45 publications

Molecular dynamics simulations of cold welding of nanoporous amorphous alloys: effects of welding conditions and microstructures

Molecular dynamics simulations of cold welding of nanoporous amorphous alloys: effects of welding conditions and microstructures

Severe deformation-induced microstructural heterogeneities in Cu₆₄Zr₃₆ metallic glass

The Effects of Temperature and Impact Velocity on the Shock Wave Response of Pore-Embedded Metallic Glasses

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Control of shear band formation in metallic glasses through introducing nanoscale pores

Cited by 9 publications

References 45 publications

Molecular dynamics simulations of cold welding of nanoporous amorphous alloys: effects of welding conditions and microstructures

Molecular dynamics simulations of cold welding of nanoporous amorphous alloys: effects of welding conditions and microstructures

Severe deformation-induced microstructural heterogeneities in Cu64Zr36 metallic glass

The Effects of Temperature and Impact Velocity on the Shock Wave Response of Pore-Embedded Metallic Glasses

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Severe deformation-induced microstructural heterogeneities in Cu₆₄Zr₃₆ metallic glass