Specific heat of Zr-based metallic glasses

• Published in: Journal of alloys and compounds 2008-08, Vol.461 (1), p.39-41
• Main Authors: Kanomata, T., Sato, Y., Sugawara, Y., Kimura, H.M., Kaneko, T., Inoue, A.
• Format: Article
• Language: English
• Subjects: Condensed matter: structure, mechanical and thermal properties; Equations of state, phase equilibria, and phase transitions; Exact sciences and technology; Glass transition; Glass transitions; Heat capacity; Metallic glass; Ni 60Al 15Cu 15Ni 7.5Co 2.5; Physics; Specific heat; Specific phase transitions; Structural relaxation; Thermal properties of condensed matter; Thermal properties of crystalline solids; Zr 65Al 7.5Cu 27.5
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2007.07.051

The specific heat of Zr-based Zr 60Al 15Cu 15Ni 7.5Co 2.5 and Zr 65Al 7.5Cu 27.5 metallic glasses was measured in the temperature range from 77 to 800 K using an ac calorimeter. Several exothermic and endothermic processes were observed indicating the transformation sequences required to completely crystallize both glasses. A decrease in the specific heat is ascribed to structural relaxation. The specific heat increases monotonically through the glass transition temperature ( T g), peaks and then decreases abruptly with increasing temperature. The amplitude and maximum temperature ( T p) of the peak increase with an increase of heating rate. The T p increases from 729 K at 2 K min −1 to 774 K at 40 K min −1.