Decreasing activation energy of fast relaxation processes in a metallic glass during aging

Martin Luckabauer, Tomoki Hayashi, Hidemi Kato, Tetsu Ichitsubo

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Abstract

Many of the macroscopic properties of a glass are determined by the degree of structural relaxation. When the nonequilibrium system ages toward a thermodynamically more favorable state, the accompanying densification leads to an increase of the activation energies found for the α and especially the β relaxation processes. In this work we experimentally quantify the low-energy mechanical relaxation spectrum of a metallic glass at cryogenic temperatures, and show that these relaxation processes intriguingly show the opposite trend. The energy scale as well as the relaxation strength decrease during the aging process below the glass transition temperature with a surprisingly strong dependence on the annealing time. The experimental results are analyzed in the framework of established models and the temporal behavior of the typical energy V0 is assessed. We compare the derived values to the values of the thermal energy available at the estimated fictive temperature of the given state and find that the absolute values as well as their temporal behavior show a high degree of correlation for the studied metallic glass. The decreasing characteristic energy values found in the present experiment directly depict the evolution of the structure toward a hypothetical lowest entropy state before the glass becomes structurally indistinguishable from a crystalline material.
Original languageEnglish
Article number140202(R)
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume99
Issue number14
DOIs
Publication statusPublished - 19 Apr 2019
Externally publishedYes

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Metallic glass
Relaxation processes
metallic glasses
Activation energy
Aging of materials
activation energy
Anelastic relaxation
Glass
Structural relaxation
Thermal energy
Densification
Cryogenics
Entropy
Annealing
Crystalline materials
Temperature
energy
glass
cryogenic temperature
densification

Cite this

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title = "Decreasing activation energy of fast relaxation processes in a metallic glass during aging",
abstract = "Many of the macroscopic properties of a glass are determined by the degree of structural relaxation. When the nonequilibrium system ages toward a thermodynamically more favorable state, the accompanying densification leads to an increase of the activation energies found for the α and especially the β relaxation processes. In this work we experimentally quantify the low-energy mechanical relaxation spectrum of a metallic glass at cryogenic temperatures, and show that these relaxation processes intriguingly show the opposite trend. The energy scale as well as the relaxation strength decrease during the aging process below the glass transition temperature with a surprisingly strong dependence on the annealing time. The experimental results are analyzed in the framework of established models and the temporal behavior of the typical energy V0 is assessed. We compare the derived values to the values of the thermal energy available at the estimated fictive temperature of the given state and find that the absolute values as well as their temporal behavior show a high degree of correlation for the studied metallic glass. The decreasing characteristic energy values found in the present experiment directly depict the evolution of the structure toward a hypothetical lowest entropy state before the glass becomes structurally indistinguishable from a crystalline material.",
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Decreasing activation energy of fast relaxation processes in a metallic glass during aging. / Luckabauer, Martin ; Hayashi, Tomoki; Kato, Hidemi; Ichitsubo, Tetsu.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 99, No. 14, 140202(R), 19.04.2019.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Decreasing activation energy of fast relaxation processes in a metallic glass during aging

AU - Luckabauer, Martin

AU - Hayashi, Tomoki

AU - Kato, Hidemi

AU - Ichitsubo, Tetsu

PY - 2019/4/19

Y1 - 2019/4/19

N2 - Many of the macroscopic properties of a glass are determined by the degree of structural relaxation. When the nonequilibrium system ages toward a thermodynamically more favorable state, the accompanying densification leads to an increase of the activation energies found for the α and especially the β relaxation processes. In this work we experimentally quantify the low-energy mechanical relaxation spectrum of a metallic glass at cryogenic temperatures, and show that these relaxation processes intriguingly show the opposite trend. The energy scale as well as the relaxation strength decrease during the aging process below the glass transition temperature with a surprisingly strong dependence on the annealing time. The experimental results are analyzed in the framework of established models and the temporal behavior of the typical energy V0 is assessed. We compare the derived values to the values of the thermal energy available at the estimated fictive temperature of the given state and find that the absolute values as well as their temporal behavior show a high degree of correlation for the studied metallic glass. The decreasing characteristic energy values found in the present experiment directly depict the evolution of the structure toward a hypothetical lowest entropy state before the glass becomes structurally indistinguishable from a crystalline material.

AB - Many of the macroscopic properties of a glass are determined by the degree of structural relaxation. When the nonequilibrium system ages toward a thermodynamically more favorable state, the accompanying densification leads to an increase of the activation energies found for the α and especially the β relaxation processes. In this work we experimentally quantify the low-energy mechanical relaxation spectrum of a metallic glass at cryogenic temperatures, and show that these relaxation processes intriguingly show the opposite trend. The energy scale as well as the relaxation strength decrease during the aging process below the glass transition temperature with a surprisingly strong dependence on the annealing time. The experimental results are analyzed in the framework of established models and the temporal behavior of the typical energy V0 is assessed. We compare the derived values to the values of the thermal energy available at the estimated fictive temperature of the given state and find that the absolute values as well as their temporal behavior show a high degree of correlation for the studied metallic glass. The decreasing characteristic energy values found in the present experiment directly depict the evolution of the structure toward a hypothetical lowest entropy state before the glass becomes structurally indistinguishable from a crystalline material.

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JO - Physical review B: Condensed matter and materials physics

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