Analysis of Cooperativity in Metallic Glass Forming Liquids

Aniya, Masaru; Ikeda, Masahiro

doi:10.4028/www.scientific.net/msf.783-786.1889

Cited by 4 publications

(3 citation statements)

References 27 publications

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“…( 2), we obtain an expression of the cooperativity N B as a function of the fragility m. This is given by N B = ln(10)m/C. Our previous studies have confirmed this interrelationship and the applicability of this relation to glass-forming materials [12,13].…”

Section: Thermec 2016supporting

confidence: 54%

A Comparative Study of Molecular Motion Cooperativity in Polymeric and Metallic Glass-Forming Liquids

Aniya¹,

Ikeda²,

Sahara

2016

MSF

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In order to investigate the relationship between the bonding nature and the cooperative relaxation, a comparative study of the relaxation behavior in polymeric and metallic glass forming systems has been performed based on the Bond Strength–Coordination Number Fluctuation (BSCNF) model developed by the authors. In the present work, we studied the correlations between the fragility m, the Vogel temperature T0, the degree of molecular cooperativity NB, and the Kohlrausch exponent βKWW. The results show that T0 and NB increase, whereas βKWW decreases systematically with the increase of m. Reflecting the difference of the interatomic interactions of the materials considered, the analysis by the present study reveals that the value of NB in ion-conducing polymers is about 5 times larger than that in metallic systems, and for each system, the material dependence of βKWW is clearly seen in the fragility index m and the cooperativity NB.

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Section: Thermec 2016supporting

confidence: 54%

A Comparative Study of Molecular Motion Cooperativity in Polymeric and Metallic Glass-Forming Liquids

Aniya¹,

Ikeda²,

Sahara

2016

MSF

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“…It has been suggested that a group about 10 atoms are involved in the collective atomic transport processes occurring in the supercooled liquid state [9]. Regarding the cooperativity of atomic dynamics in supercooled liquids, our analysis based on the Bond Strength-Coordination Number Fluctuation model [21] indicates that the number of structural units involved vary with temperature [22]. The connection of such a cooperativity with the fragility has been also investigated [23].…”

Section: Structural Alloysmentioning

confidence: 87%

Diffusion in Metallic Glass-Forming Systems: A Description of the Kink Behavior Observed in the Temperature Dependence

Aniya,

Ikeda

2023

SSP

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The temperature dependence of the diffusion coefficient in metallic glass-forming systems do not follow the Arrhenius behavior over a wide temperature range. Instead, it exhibits a kink behavior at around the glass transition temperature. Some researchers associate this behavior to the difference in the diffusion mechanism operating in the glassy and the supercooled liquid state, whereas others do not support this view. In addition, usually, the temperature dependence of the diffusion coefficient is analyzed by splitting the temperature range into two regions, above and below the glass transition temperature. In the present study, we developed an analytical theory that describes the continuous variation of the diffusion coefficient across a temperature where the kink behavior is observed. According to the theory, the kink behavior arises from the freezing of free volume available for diffusion by lowering the temperature. A connection to the vacancy mechanism of diffusion has been also pointed out.

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“…In a previous study, Eq. ( 5) has been used to study the cooperativity of MGFLs [14]. There it was shown that at the glass transition temperature 𝐶𝐶 = 1, NB varies roughly between 10 and 50.…”

Section: The Bond Strength-coordination Number Fluctuation Model: a B...mentioning

confidence: 99%

Model Description of the Unusual Temperature Dependence of the Viscosity of Metallic Glass-Forming Liquids

Aniya

Ikeda²

2021

MSF

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The temperature dependence of the viscosity of some metallic glass forming liquids (MGFLs) exhibits an unusual behavior. At high temperature, the temperature dependence is quite weak, whereas at low temperature, the viscosity varies exponentially. Recently, this type of behavior are attracting much attention, because it can be considered as a manifestation of the fragile-to-strong transition. Well known classic viscosity models do not describe such kind of behavior over a wide temperature range. In the present report, it is shown that a modified version of the Bond Strength-Coordination Number Fluctuation (BSCNF) model describes the behavior observed in MGFLs. For the convenience of the readers, a brief review of the BSCNF model is also given.

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Analysis of Cooperativity in Metallic Glass Forming Liquids

Cited by 4 publications

References 27 publications

A Comparative Study of Molecular Motion Cooperativity in Polymeric and Metallic Glass-Forming Liquids

A Comparative Study of Molecular Motion Cooperativity in Polymeric and Metallic Glass-Forming Liquids

Diffusion in Metallic Glass-Forming Systems: A Description of the Kink Behavior Observed in the Temperature Dependence

Model Description of the Unusual Temperature Dependence of the Viscosity of Metallic Glass-Forming Liquids

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