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Title:
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Fragility measurement of Pd-based metallic glass by dynamic mechanical analysis
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Author:
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Pineda Soler, Eloi; Serrano Gutiérrez, Jorge; Bruna Escuer, Pere; Crespo Artiaga, Daniel
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Other authors:
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Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear; Universitat Politècnica de Catalunya. Departament de Física Aplicada; Universitat Politècnica de Catalunya. GCM - Grup de Caracterització de Materials |
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Abstract:
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The measurement of fragility of glass-forming liquids involves either the determination of viscosity at
different temperatures above the glass transition or the measurement of the dynamic glass–liquid transition
by calorimetry or dilatometry at different heating rates. Significant data dispersion is observed when
comparing fragility parameters obtained by different techniques. Dynamic mechanical analysis (DMA) is
widely used for characterizing glass transition in polymer science while it is still seldom used in metallic
glasses. In this work we determine the relaxation time ( ) vs temperature of a Pd77.5Si16.5Cu6 glass by
means ofDMAmeasurements. The measured range of relaxation times cover the whole region from glass
transition ( > 100 s) to times of the order of 10−2 s. The fragility parameter obtained for this alloy is found
significantly higher than the values obtained from previous viscosity and calorimetric techniques. The
application range, limitations and correctness of the technique are discussed. |
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Subject(s):
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-Àrees temàtiques de la UPC::Física
-Àrees temàtiques de la UPC::Enginyeria dels materials
-Metallic glasses
-Metals--Rapid solidification processing
-Amorphous materials
-Metallic glasses
-Rapid-solidification
-Quenching
-Cristalls metàl·lics
-Solidificació de metalls |
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Rights:
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Document type:
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Article - Published version
Article |
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