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Correlation between thermal stability and β relaxation of La–Ce–Al–Co–Ga bulk metallic glasses.

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Název: Correlation between thermal stability and β relaxation of La–Ce–Al–Co–Ga bulk metallic glasses.
Autoři: Shang, Xiong1 zijingli@ysu.edu.cn, Yang, Liang1, Tu, Wenkang2, Li, Zijing3 shidongfeng@ysu.edu.cn, Feng, Shidong1 limin_wang@ysu.edu.cn, Wang, Li-Min1
Zdroj: Journal of Chemical Physics. 8/21/2025, Vol. 163 Issue 7, p1-8. 8p.
Témata: *THERMAL stability, *THERMOPLASTICS, *TEMPERATURE, *THERMAL properties, *ACTIVATION energy
Abstrakt: The thermal instability of metallic glasses hinders their application and thermoplastic processing, and, at present, how to improve the thermal stability is a scientific topic worthy of further study. This paper, through the studies of a [(La0.7Ce0.3)65Al10Co25]100−xGax model system, reveals three correlations between β relaxation of metallic glasses and their thermal stability, stating that (1) the ratio of the β relaxation intensity to the α relaxation intensity, E″β/E″α, is positively correlated with the glass transition temperature, Tg; (2) at a fixed frequency, the ratio of the β relaxation temperature to the α relaxation temperature, Tβ/Tα, is positively correlated with the supercooled liquid region width, ∆Tx = Tx − Tg; (3) ∆Tx is negatively correlated with the β relaxation activation energy, Eβ. These identified relationships between β relaxation and the thermal instability of metallic glasses deepen the understanding of factors influencing the glass stability and offer a viable strategy to enhance the thermal stability of metallic glasses by regulating the β relaxation process. [ABSTRACT FROM AUTHOR]
Databáze: Academic Search Index
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Abstrakt:The thermal instability of metallic glasses hinders their application and thermoplastic processing, and, at present, how to improve the thermal stability is a scientific topic worthy of further study. This paper, through the studies of a [(La0.7Ce0.3)65Al10Co25]100−xGax model system, reveals three correlations between β relaxation of metallic glasses and their thermal stability, stating that (1) the ratio of the β relaxation intensity to the α relaxation intensity, E″β/E″α, is positively correlated with the glass transition temperature, Tg; (2) at a fixed frequency, the ratio of the β relaxation temperature to the α relaxation temperature, Tβ/Tα, is positively correlated with the supercooled liquid region width, ∆Tx = Tx − Tg; (3) ∆Tx is negatively correlated with the β relaxation activation energy, Eβ. These identified relationships between β relaxation and the thermal instability of metallic glasses deepen the understanding of factors influencing the glass stability and offer a viable strategy to enhance the thermal stability of metallic glasses by regulating the β relaxation process. [ABSTRACT FROM AUTHOR]
ISSN:00219606
DOI:10.1063/5.0282281