Relaxation dynamics of Fe55Cr10Mo14C15B6 metallic glass explored by mechanical spectroscopy and calorimetry measurements

In this work, the mechanical relaxation dynamics of Fe 55 Cr 10 Mo 14 C 15 B 6 metallic glass is explored by mechanical spectroscopy. The temperature-dependent loss modulus E ″( T ) shows the features of β relaxation well below glass transition temperature T g . This β relaxation can be well describ...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2016-08, Vol.125 (2), p.711-719
Main Authors: Liu, Chaoren, Madinehei, Milad, Pineda, Eloi, Crespo, Daniel
Format: Article
Language:English
Subjects:
Analytical Chemistry
Anelastic
Chemistry
Chemistry and Materials Science
Enginyeria dels materials
Inorganic Chemistry
Measurement Science and Instrumentation
Mechanical relaxation
Metallic glass
Metallic glasses
Physical aging
Physical Chemistry
Polymer Sciences
Structural relaxation
Vidres metàl·lics
Viscosity
Àrees temàtiques de la UPC
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Summary:In this work, the mechanical relaxation dynamics of Fe 55 Cr 10 Mo 14 C 15 B 6 metallic glass is explored by mechanical spectroscopy. The temperature-dependent loss modulus E ″( T ) shows the features of β relaxation well below glass transition temperature T g . This β relaxation can be well described in the framework of anelastic theory by a thermal activated process with activation energy of 165 kJ mol −1 . Structural relaxation, also known as physical aging, has a large effect on the glass properties. The activation energy spectrum of structural relaxation is characterized by differential scanning calorimetry measuring the heat flow difference between as-quenched and relaxed states. The obtained energy spectrum is well described by a lognormal distribution with maximum probability activation energy of 176 kJ mol −1 . The obtained activation energy of structural relaxation is similar to that of β relaxation observed from mechanical spectroscopy. Both values are also close to the Johari–Goldstein β relaxation estimated by the empirical rule E β  = 26 RT g .
ISSN:1388-6150
1588-2926
1588-2926
DOI:10.1007/s10973-016-5379-9