Relationship between thermal expansion coefficient and glass transition temperature in metallic glasses

• Published in: Scripta materialia Vol. 58; no. 12; pp. 1106 - 1109
• Main Authors: Kato, H., Chen, H.-S., Inoue, A.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.06.2008
• Subjects: Activation; Amorphous materials; Correlation; Debye temperature; Glass transition; Glass transition temperature; Metallic glass; Metallic glasses; Thermal expansion; Thermal expansion coefficient; Thermally activated process; Thermal expansion coefficient; Thermally activated process; Metallic glass
• ISSN: 1359-6462; 1872-8456
• DOI: 10.1016/j.scriptamat.2008.02.006

The thermal expansion coefficients of 13 metallic glasses were measured using a thermo-mechanical analyser. A unique correlation was found between the linear thermal expansion coefficient and the glass transition temperature—their product is nearly constant ∼8.24 × 10 −3. If one assumes the Debye expression for thermal activation, the total linear thermal expansion up to glass transition temperature ( T g) is reduced to 6 × 10 −3, nearly 25% of that at the fusion of pure metals.