Pressure Effects on the Transport and Structural Properties of Metallic Glass-Forming Liquid

Cao, Qilong; Huang, Duohui; Junsheng, Yang; Wang, Fanhou

doi:10.1088/0256-307x/37/7/076201

Cited by 6 publications

(4 citation statements)

References 32 publications

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“…The structural relaxation time τ α is estimated by the time decaying to 1/ e. [25] Figure 3 shows the logarithm plot of the relaxation time as a function of the inverse of temperature upon approaching glass transition. The relaxation is shown to be slowed down by doping H atoms, and moreover, it is more pronounced with increasing concentration of H. All the temperature dependences of relaxation time obey the Vogel-Fulcher-Tamman law (VFT) [26] The fragility of supercooled liquids can also be measured from a thermodynamic point of view. We calculate the specific heat C p in the NPT ensemble through glass transition.…”

Section: Resultsmentioning

confidence: 99%

Hydrogen-induced dynamic slowdown of metallic glass-forming liquids*

Gao¹,

Huang²,

Lü³

2021

Chinese Phys. B

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Dynamics of hydrogen doped Cu50Zr50 glass-forming liquids are investigated by using the newly developed modified embedded atomic method (MEAM) potential based on molecular dynamics simulations. We find that the doping of hydrogen atoms slows down the relaxation dynamics, reduces the fragility of supercooled melts, and promotes the occurrence of glass transitions. The dynamic slowdown is suggested to be closely related to the effect of hydrogen atoms on locally ordered structure of melts. With increasing concentration of hydrogen, the five-fold symmetry associated with Cu- and Zr-centered polyhedrons is lowered, on the other hand, the local order featuring metal hydrides is enhanced. The latter dominates the dynamic behaviors of glass-forming liquids, especially for Zr atoms, and results in the dynamic slowdown.

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Section: Resultsmentioning

confidence: 99%

Hydrogen-induced dynamic slowdown of metallic glass-forming liquids*

Gao¹,

Huang²,

Lü³

2021

Chinese Phys. B

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“…Understanding the entity of the free volume may be useful in interpreting the new phenomena of MG nanoparticles, [30] MG nanowires, [31] MG composite, [32] and the MG-forming liquid. [33] 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 Table 1. Parameters 𝑉 0 , Δ𝑉 , 𝛼 0 , 𝛼m and 𝛼 f of the La-based and Zr-based MGs.…”

Section: -3mentioning

confidence: 99%

A Free-Volume Model for Thermal Expansion of Metallic Glass

Tong¹,

Liu²,

Sun³

et al. 2022

Chinese Phys. Lett.

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Many mechanical, thermal and transport behaviors of polymers and metallic glasses are interpreted by the free-volume model, whereas their applications on thermal expansion behaviors of glasses is rarely seen. Metallic glass has a range of glassy states depending on cooling rate, making their coefficients of thermal expansion vary with the glassy states. Anharmonicity in the interatomic potential is often used to explain different coefficients of thermal expansion in crystalline metals or in different metallic-glass compositions. However, it is unclear how to quantify the change of anharmonicity in the various states of metallic glass of the same composition and to connect it with coefficient of thermal expansion. In the present work, isothermal annealing is applied, and the dimensional changes are measured for La62Al14Cu11.7Ag2.3Ni5Co5 and Zr52.5Cu17.9Ni14.6Al10Ti5 metallic glasses, from which changes in density and the coefficients of thermal expansion of the specimens are both recorded. The coefficients of thermal expansion linearly decrease with densification reflecting the role of free volume in thermal expansion. Free volume is found to have not only volume but also entity with an effective coefficient of thermal expansion similar to that of gases. Therefore, the local regions containing free volume inside the metallic glass are gas-like instead of liquid-like in terms of thermal expansion behaviors.

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“…In general, it is considered that the real contact area increases approximately linearly with the increase of normal load. [8,[11][12][13][14][15][16] However, in recent years, scholars have found that the relationship between real contact area and normal load is not a simple linear relationship with the increase of contact scale. [2,[17][18][19][20][21][22] The size of the contact interface, the contact material, the surface morphology and the loading mode may lead to real contact area growth slowing down with the increase of the normal load.…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis of interface contact behavior using a novel image processing method*

Han¹,

Luo²,

Zhang³

et al. 2021

Chinese Phys. B

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The spatial and temporal evolution of real contact area of contact interface with loads is a challenge. It is generally believed that there is a positive linear correlation between real contact area and normal load. However, with the development of measuring instruments and methods, some scholars have found that the growth rate of real contact area will slow down with the increase of normal load under certain conditions, such as large-scale interface contact with small roughness surface, which is called the nonlinear phenomenon of real contact area. At present, there is no unified conclusion on the explanation of this phenomenon. We set up an experimental apparatus based on the total reflection principle to verify this phenomenon and analyze its mechanism. An image processing method is proposed, which can be used to quantitative analysis micro contact behaviors on macro contact phenomenon. The weighted superposition method is used to identify micro contact spots, to calculate the real contact area, and the color superimposed image is used to identify micro contact behaviors. Based on this method, the spatiotemporal evolution mechanism of real contact area nonlinear phenomena is quantitatively analyzed. Furthermore, the influence of nonlinear phenomenon of real contact area on the whole loading and unloading process is analyzed experimentally. It is found that the effects of fluid between contact interface, normal load amplitude and initial contact state on contact behavior cannot be ignored in large-scale interface contact with small roughness surface.

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Pressure Effects on the Transport and Structural Properties of Metallic Glass-Forming Liquid

Cited by 6 publications

References 32 publications

Hydrogen-induced dynamic slowdown of metallic glass-forming liquids*

Hydrogen-induced dynamic slowdown of metallic glass-forming liquids*

A Free-Volume Model for Thermal Expansion of Metallic Glass

Experimental analysis of interface contact behavior using a novel image processing method*

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