Key factors affecting mechanical behavior of metallic glass nanowires

Zhang, Qi; Qikai, Li; Li, Mo

doi:10.1038/srep41365

Cited by 19 publications

(11 citation statements)

References 32 publications

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“…During the last decade, the mechanical properties of metallic glass nanowires subjected to uniaxial tension have been investigated using molecular dynamics simulations [11][12][13][14] and experimental measurements [15][16][17][18]. It was observed that when the size of metallic glass samples is reduced down to the nanoscale, the deformation mode changes from brittle to ductile [13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Structural transformations in porous glasses under mechanical loading. I. Tension

Priezjev,

Makeev

2017

Preprint

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The evolution of porous structure and mechanical properties of binary glasses under tensile loading were examined using molecular dynamics simulations. We consider vitreous systems obtained in the process of phase separation after a rapid isochoric quench of a glass-forming liquid to a temperature below the glass transition. The porous structure in undeformed samples varies from a connected porous network to a random distribution of isolated pores upon increasing average glass density. We find that at small strain, the elastic modulus follows a power-law dependence on the average glass density and the pore size distribution remains nearly the same as in quiescent samples. Upon further loading, the pores become significantly deformed and coalesce into larger voids that leads to formation of system-spanning empty regions associated with breaking of the material.

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Section: Introductionmentioning

confidence: 99%

Structural transformations in porous glasses under mechanical loading. I. Tension

Priezjev,

Makeev

2017

Preprint

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“…As the strain is higher than the yielding strain, the alloys exhibited an abrupt decrease in strength, corresponding to spontaneous shear localization into a narrow band [Cao, Cheng and Ma (2009)]. It is note that the yielding stress, Young's modulus, and yielding strain for Cu64Zr36 BMG are all corresponding to those observed by theoretical studies [Zhang, Li and Li (2017); Lee, Park, Kim et al (2007)]. In addition, the yielding strain and yielding stress are both much higher than those of poly grain Cu (εy<5%) [Xiang, Cui and Tian (2013)].…”

Section: Model Of Amorphous Cu64zr36/ Crystalline Cu Multi-layered Stmentioning

confidence: 83%

“…Therefore, several studies have been proposed to understand the mechanically deformation of metallic glass. Shear band is the main cause of mechanical deformation in metallic [Feng, Wang, Pan et al (2015); Zhang, Li and Li (2017); Cui, Abad, Wang et al (2016)]. Plastic deformation is produced by shear band propagation and initiation in ductile manner metallic glass [Feng, Wang, Pan et al (2015); Zhang, Li and Li (2017); Cui, Abad, Wang et al (2016)].…”

Section: Introductionmentioning

confidence: 99%

“…Quantitatively understanding of shear bands mechanism has been stated [Gao (2006); Shen and Zhemg (2010); Shi and Falk (2008); Sun, Pauly, Tan et al (2012)]. Criteria to define the shear bands initiation and propagation is reported by Zhang et al [Zhang, Li and Li (2017)]. Molecular dynamics simulation increases the understandability of atomic structure explaining shear bands in metallic glass as compared to the other studies have been carried out for shear bands formability [Greer, Cheng and Ma (2013)].…”

Section: Introductionmentioning

confidence: 99%

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Thickness Effect of Nanocrystalline Layer on the Deformation Mechanism of Amorphous/Crystalline Multilayered Structure

Lee¹,

Lo²,

Yang³

et al. 2019

Computer Modeling in Engineering &Amp; Sciences

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Different thickness of amorphous/nanocrystalline multi-layered structure can be used to modulate the strength and ductility of the composite materials. In this work, molecular dynamics simulations were conducted to study the thickness effect of nanocrystalline layer on mechanical properties and deformation behavior of the Cu64Zr36/Cu multi-layer structure. The stress-strain relationship, local stress, local strain, and deformation mechanism are investigated. The results reveal that the change of thickness of the crystalline layer significantly affects the mechanical properties and deformation behavior. As the strain at the elastic region, the amorphous Cu64Zr36 layer dominates the mechanical behavior, leading the fact that Young's modulus, first yielding stress, and first yielding strain are close to that of Cu64Zr36 BMG. As the strain at the plastic region, the contribution of the crystalline layer on the mechanical behavior becomes more and more significant with increasing the thickness of the crystalline layer. For the thickness ratio (amorphous/crystalline) of 4, the shear band deformation of amorphous layer dominates the mechanical properties. For the thickness ratio is 1, the glide dislocation of the crystalline layer dominates the stress-strain behavior.

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“…As depicted by Sopu et al 46 , the decrease of specimen size to the nanoscale regime, the strain softening is extended in the structure and the failure is deferred in the system. Moreover, it was found that the low aspect ratio inhibits the catastrophic failure under the tension mode, especially in the rejuvenated structures with high potential sites for the formation of nanoscale shear events [46][47][48] . Hence, it is concluded that the significant homogenous plastic deformation in the high-cycled samples may be related to the features of MD simulation.…”

Section: Resultsmentioning

confidence: 99%

Combined Effects of Annealing and Cyclic Loading on Structural Rejuvenation and Mechanical Properties of CuZr Metallic Glass: A Molecular Dynamics Study

Anggono¹,

Mahmoud

Suksatan

et al. 2022

Mat. Res.

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Structural rejuvenation is one of the key topics in the field of metallic glasses (MGs). In this work, we evaluated the combined effects of annealing treatment and elastic cyclic loading to discover pathways for promoting structural rejuvenation and improving the mechanical properties in the MGs. Using molecular dynamics (MD) simulations, it was revealed that the sole cyclic loading led to the increase of rejuvenation degree; however, a saturated state was observed upon the 40 th cycle. On the other side, the sample exposed to the combined treatment exhibited a slight relaxation at the first step of cycling process and then a sharp rejuvenation degree was detected in the material. The thorough analyses indicated that the change in the fraction of coordination polyhedrons at the relaxation stage was the main reason for the extra rejuvenation in the sample exposed to the combined treatments. The results also suggest that the combination of rejuvenation treatments improves the magnitude of rejuvenation in the amorphous alloys. It should be noted that the increase of rejuvenation in the alloying systems accompanied with a reduction in the tensile strength and an enhancement in the homogenous plastic deformation.

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Key factors affecting mechanical behavior of metallic glass nanowires

Cited by 19 publications

References 32 publications

Structural transformations in porous glasses under mechanical loading. I. Tension

Structural transformations in porous glasses under mechanical loading. I. Tension

Thickness Effect of Nanocrystalline Layer on the Deformation Mechanism of Amorphous/Crystalline Multilayered Structure

Combined Effects of Annealing and Cyclic Loading on Structural Rejuvenation and Mechanical Properties of CuZr Metallic Glass: A Molecular Dynamics Study

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