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

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14 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, 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.

Original languageEnglish
Pages (from-to)116-120
Number of pages5
JournalIntermetallics
Volume44
DOIs
Publication statusPublished - 2014 Jan 1

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Energy barriers
Free volume
Amorphous alloys
Potential energy
Cryogenics
Activation energy
Annealing
Heating
Experiments
Temperature

Keywords

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

ASJC Scopus subject areas

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

Cite this

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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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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

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KW - C. Rapid solidification processing

KW - D. Microstructure

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