Rejuvenation by weakening the medium range order in Zr46Cu46Al8 metallic glass with pressure preloading: A molecular dynamics simulation study

Feng, Shidong; Chan, Kang Cheung; Zhao, Lei; Pan, Shaopeng; Qi, Li; Wang, L.M.; Liu, R.P.

doi:10.1016/j.matdes.2018.08.040

Cited by 63 publications

(18 citation statements)

References 80 publications

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“…By randomly removing atoms from the as-cast glassy matrix, free volume content increases, which could be correlated to the rejuvenation of MGs [ 15 ]. The generation and annihilation of free volume during the dilution procedure were monitored and represented by the Voronoi volume variation which is calculated by the Voronoi tessellation method [ 19 , 32 , 33 ]. As shown in Figure 1 a, four stages of Voronoi volume evolution can be found.…”

Section: Resultsmentioning

confidence: 99%

“…Rejuvenation can be induced by reheating [ 6 , 7 , 8 ] and faster quenching [ 9 ], thermal cycling [ 10 ], elastostatic and heavy plastic deformation [ 11 , 12 , 13 , 14 , 15 ], irradiation [ 16 ], etc. Rejuvenation is an effective way to inspire the structure of MGs to restore flexibility with the increase of free volume and enthalpy [ 17 , 18 , 19 , 20 ] and it is regarded as a promising approach for tuning the deformability of MGs. It is now seen as a common way to improve the plasticity of MGs [ 11 , 21 ] since it can ameliorate the highly localized deformation mechanism and could ultimately eliminate the formation of critical shear bands [ 7 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

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Relaxation and Strain-Hardening Relationships in Highly Rejuvenated Metallic Glasses

et al. 2022

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One way to rejuvenate metallic glasses is to increase their free volume. Here, by randomly removing atoms from the glass matrix, free volume is homogeneously generated in metallic glasses, and glassy states with different degrees of rejuvenation are designed and further mechanically tested. We find that the free volume in the rejuvenated glasses can be annihilated under tensile or compressive deformation that consequently leads to structural relaxation and strain-hardening. Additionally, the deformation mechanism of highly rejuvenated metallic glasses during the uniaxial loading–unloading tensile tests is investigated, in order to provide a systematic understanding of the relaxation and strain-hardening relationship. The observed strain-hardening in the highly rejuvenated metallic glasses corresponds to stress-driven structural and residual stress relaxation during cycling deformation. Nevertheless, the rejuvenated metallic glasses relax to a more stable state but could not recover their initial as-cast state.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Relaxation and Strain-Hardening Relationships in Highly Rejuvenated Metallic Glasses

et al. 2022

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“…The enthalpy and free volume of metallic glasses can considerably rise by the rejuvenation process by the structural excitation. Feng et al (2018) reported the rejuvenation in Zr 46 Cu 46 A l8 metallic glasses by molecular dynamics simulation using a pressure preloading model. They found that high-density deformation units in different regions are gradually formed by increasing strain in the rejuvenated Zr 46 Cu 46 A l8 metallic glass with pressure preloading.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Severe Plastic Deformation Processes in Bulk and Nanostructured Metallic Glass

et al. 2022

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The metallic glasses are known as amorphous and metastable materials. These materials have superior mechanical properties over crystalline materials with the same chemistry. Continuous efforts were made to improve the properties of metallic glass. The severe plastic deformation (SPD) method is used to improve the ductility of the glass. SPD causes the deformation at the atomic level in the disordered structure of the glass. Many methods are reported, such as cryogenic cycling, high-pressure torsion, and equal channel angular pressing, which are used for the SPD. In recent works on nanostructured metallic glasses, it has been evidenced that some properties, for example, mechanical, thermal, and magnetic, have improved compared to the bulk metallic glass. This paper has reviewed the recent progress in the SPD of the bulk and nanostructured metallic glasses. Different methods for the SPD have been addressed here. The effect of SPD on the properties of metallic glass is deliberated in this paper. Moreover, the challenging tasks of deformation occurrence in the glass and its characterization were considered, trying to develop a sound understanding of SPD in bulk and nanostructured metallic glasses.

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“…The formation of densely packed icosahedral ordering would increase the barrier to the formation of a crystalline structure [22,23], but would improve the GFA of a supercooled liquid. However, how these local motifs, representing various SROs, spatially distribute and interconnect with adjacent atomic clusters remains a mystery, and considerable efforts have been made to clarify a higher hierarchy of atomic configuration, i.e., the medium-range orders (MROs) [24][25][26][27][28]. Recently, studies have shown that the plastic deformation capacity of Zr-based glassy alloys could be further enhanced by tailoring the topological orders based on MRO sizes, types, and volume fractions [29].…”

Section: Introductionmentioning

confidence: 99%

Construction of Al-Mg-Zn Interatomic Potential and the Prediction of Favored Glass Formation Compositions and Associated Driving Forces

Cai

Wang

et al. 2022

Materials

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An interatomic potential is constructed for the ternary Al-Mg-Zn system under a proposed modified tight-binding scheme, and it is verified to be realistic. Applying this ternary potential, atomistic simulations predict an intrinsic glass formation region in the composition triangle, within which the glassy alloys are more energetically favored in comparison with their solid solution counterparts. Kinetically, the amorphization driving force of each disordered state is derived to correlate the readiness of its glass-forming ability in practice; thus, an optimal stoichiometry region is pinpointed around Al35Mg35Zn30. Furthermore, by monitoring the structural evolution for various (Al50Mg50)1−xZnx (x = 30, 50, and 70 at.%) compositions, the optimized-glass-former Al35Mg35Zn30 is characterized by both the highest degree of icosahedral ordering and the highest phase stability among the investigated compositions. In addition, the icosahedral network in Al35Mg35Zn30 exhibits a much higher cross-linking degree than that in Al25Mg25Zn50. This suggests that there is a certain correlation between the icosahedral ordering and the larger glass-forming ability of Al35Mg35Zn30. Our results have significant implications in clarifying glass formation and hierarchical atomic structures, and in designing new ternary Al-Mg-Zn glassy alloys with high GFA.

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Rejuvenation by weakening the medium range order in Zr46Cu46Al8 metallic glass with pressure preloading: A molecular dynamics simulation study

Cited by 63 publications

References 80 publications

Relaxation and Strain-Hardening Relationships in Highly Rejuvenated Metallic Glasses

Relaxation and Strain-Hardening Relationships in Highly Rejuvenated Metallic Glasses

Assessment of Severe Plastic Deformation Processes in Bulk and Nanostructured Metallic Glass

Construction of Al-Mg-Zn Interatomic Potential and the Prediction of Favored Glass Formation Compositions and Associated Driving Forces

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