Glass Transition of Liquids and Frozen Deformation of Glass

Сандитов, Д. С.; Badmaev, S. S.

doi:10.1134/s0020168519100121

Cited by 7 publications

(6 citation statements)

References 14 publications

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“…The cooling procedure of an equilibrium liquid melt with the ultrafast cooling rates (higher than 10 6 K/s) and ultrafast heat dissipation can be applied to obtain a porous material with the amorphous structure and to prevent the crystal nucleation events [13,14,15]. In practice, these conditions are difficult to be realized for the most known metallic alloys [16,17,18,19,20]. Titanium nickelide alloy (Ni 50 Ti 50 or NiTi) is the most famous functional material among intermetallic compounds especially due to the shape memory effect of this alloy [21,22,23,24,25,26,27].…”

Section: Introductionmentioning

confidence: 99%

Mechanical response of mesoporous amorphous NiTi alloy to external deformations

Galimzyanov

Мокшин

2021

International Journal of Solids and Structures

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The porous titanium nickelide is very popular in various industries due to unique combination of physical and mechanical properties such as shape memory effect, high corrosion resistance, and biocompatibility. The non-equilibrium molecular dynamics simulation was applied to study the influence of porosity degree on mechanical properties of porous amorphous titanium nickelide at uniaxial tension, uniaxial compression, and uniform shear. We have found that the porous amorphous alloy is characterized by a relatively large value of Young's modulus in comparison to its crystalline analogue. It has been found that the system with a percolated network of pores exhibits improved elastic characteristics associated with resistance to tensile and shear. The system contained isolated spherical pores is more resistant to compression and less resistant to tensile and shear. These results can be applied to develop and improve the methods for making amorphous metal foams.

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Section: Introductionmentioning

confidence: 99%

Mechanical response of mesoporous amorphous NiTi alloy to external deformations

Galimzyanov

Мокшин

2021

International Journal of Solids and Structures

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“…Here, α is the so-called lower fragility limit [33,34]; parameter η g defines the viscosity at the glass transition temperature T g and log η g = 12 according to definition of T g [6,14]. Avramov shows that the parameter α is related with the activation energy ∆E(T g ) [31]:…”

Section: Resultsmentioning

confidence: 99%

“…Typically, the viscosity of liquids increases with decreasing temperature. The loss of molecular mobility with decreasing temperature correlates both with increasing liquid density ρ and with decreasing entropy and thermal activation energy [12,13,14]. Alba-Simionesco and coworkers have shown that the viscosity of the most glass-forming liquids can be described using the scaled variable ρ γ /T , where γ is the parameter depending on the liquid type [15].…”

Section: Introductionmentioning

confidence: 99%

A novel view on classification of glass-forming liquids and empirical viscosity model

Galimzyanov,

Mokshin

2021

Preprint

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In the last few decades, theoretical and experimental studies of glass-forming liquids have revealed presence of universal regularities in the viscosity-temperature data. In the present work, we propose a viscosity model for scaling description of experimental viscosity data. A feature of this model is presence of only two adjustable parameters and high accuracy of experimental data approximation by this model for a wide temperature range. The basis of the scaling description is an original temperature scale. Within this scaling description we obtain the transformed Angell plot, in which the area separating "fragile" and "strong" glass-formers emerges. The proposed scaling procedure make it possible to reconsider belonging some liquids to the type of "fragile" glass-formers. The obtained results form basis for development of a generalized scaling description of crystallization kinetics in supercooled liquids and glasses.

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“…From the interpretation of the WLF equation in the framework of the model of delocalized atoms [6,8,9] it follows that the parameter C 1 is the inverse of the fraction of the fluctuation volume f g , frozen at the glass transition temperature,…”

Section: Applicability Of the Wlf Equation To Glass Under Studymentioning

confidence: 99%

“…The fluctuation volume of the amorphous substance V e is due to the thermal displacements of atoms (kinetic units) [8,9]:…”

Section: Applicability Of the Wlf Equation To Glass Under Studymentioning

confidence: 99%

Estimation of the temperature band characterizing the liquid--glass transition interval for chalcogenide glasses

A.A.

M.V.

A.B.

2022

Physics of the Solid State

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The temperature dependence of the viscosity of inorganic glasses in the glass transition region is successfully described by the Williams--Landel--Ferry (WLF) equation. For the studied glasses, the value of f_g=1/C1 weakly depends on the nature of the glasses. There is a linear correlation between delta delta Tg and Tg. From the data on the parameters of the WLF equation C1 and C2, we calculated delta delta Tg, as well as the relaxation time of the structure taug at the glass transition temperature of the glasses under study. Keywords: Viscosity in the glass transition region, Williams--Landel--Ferry equation, kinetic glass transition criterion, chalcogenide glasses, fluctuation volume fraction, liquid--glass transition.

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Glass Transition of Liquids and Frozen Deformation of Glass

Cited by 7 publications

References 14 publications

Mechanical response of mesoporous amorphous NiTi alloy to external deformations

Mechanical response of mesoporous amorphous NiTi alloy to external deformations

A novel view on classification of glass-forming liquids and empirical viscosity model

Estimation of the temperature band characterizing the liquid--glass transition interval for chalcogenide glasses

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