Calorimetric study of β-relaxation in an amorphous alloy: An experimental technique for measuring the activation energy for shear transformation

Jae Chul Lee

doi:10.1016/j.intermet.2013.09.002

Calorimetric study of β-relaxation in an amorphous alloy: An experimental technique for measuring the activation energy for shear transformation

Jae Chul Lee

GREEN SCHOOL (Graduate School of Energy and Environment)

Research output: Contribution to journal › Article › peer-review

27 Citations (Scopus)

Abstract

When loaded at cryogenic temperature under stresses below the global yield, an amorphous alloy revealed two clearly distinguishable exothermic events during heating in calorimetric experiments. These exotherms, commonly known as the α- and β-relaxations, were attributed to the annealing out of two different local structures with different structural stability, presumably free volume and shear transformation zone (STZ). In this study, we introduced a simple and reliable experimental technique, which enables the evaluation of the activation energy corresponding to the β-relaxation, E_β. Based on experimental evidence and comparison with earlier studies, it is presumed that E_β is directly related to the potential energy barrier to shear transformation.

Original language	English
Pages (from-to)	116-120
Number of pages	5
Journal	Intermetallics
Volume	44
DOIs	https://doi.org/10.1016/j.intermet.2013.09.002
Publication status	Published - 2014

Keywords

A. Intermetallics, miscellaneous
B. Glasses, metallic
C. Rapid solidification processing
D. Microstructure

ASJC Scopus subject areas

Chemistry(all)
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.intermet.2013.09.002

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title = "Calorimetric study of β-relaxation in an amorphous alloy: An experimental technique for measuring the activation energy for shear transformation",

abstract = "When loaded at cryogenic temperature under stresses below the global yield, an amorphous alloy revealed two clearly distinguishable exothermic events during heating in calorimetric experiments. These exotherms, commonly known as the α- and β-relaxations, were attributed to the annealing out of two different local structures with different structural stability, presumably free volume and shear transformation zone (STZ). In this study, we introduced a simple and reliable experimental technique, which enables the evaluation of the activation energy corresponding to the β-relaxation, Eβ. Based on experimental evidence and comparison with earlier studies, it is presumed that Eβ is directly related to the potential energy barrier to shear transformation.",

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AU - Lee, Jae Chul

PY - 2014

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N2 - When loaded at cryogenic temperature under stresses below the global yield, an amorphous alloy revealed two clearly distinguishable exothermic events during heating in calorimetric experiments. These exotherms, commonly known as the α- and β-relaxations, were attributed to the annealing out of two different local structures with different structural stability, presumably free volume and shear transformation zone (STZ). In this study, we introduced a simple and reliable experimental technique, which enables the evaluation of the activation energy corresponding to the β-relaxation, Eβ. Based on experimental evidence and comparison with earlier studies, it is presumed that Eβ is directly related to the potential energy barrier to shear transformation.

AB - When loaded at cryogenic temperature under stresses below the global yield, an amorphous alloy revealed two clearly distinguishable exothermic events during heating in calorimetric experiments. These exotherms, commonly known as the α- and β-relaxations, were attributed to the annealing out of two different local structures with different structural stability, presumably free volume and shear transformation zone (STZ). In this study, we introduced a simple and reliable experimental technique, which enables the evaluation of the activation energy corresponding to the β-relaxation, Eβ. Based on experimental evidence and comparison with earlier studies, it is presumed that Eβ is directly related to the potential energy barrier to shear transformation.

KW - A. Intermetallics, miscellaneous

KW - B. Glasses, metallic

KW - C. Rapid solidification processing

KW - D. Microstructure

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DO - 10.1016/j.intermet.2013.09.002

M3 - Article

AN - SCOPUS:84885368609

SN - 0966-9795

VL - 44

SP - 116

EP - 120

JO - Intermetallics

JF - Intermetallics

ER -

Calorimetric study of β-relaxation in an amorphous alloy: An experimental technique for measuring the activation energy for shear transformation

Abstract

Keywords

ASJC Scopus subject areas

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