Changes in elasticity and viscosity of a SiYAlON glass during structural relaxation in the transformation range

• Published in: Journal of non-crystalline solids Vol. 175; no. 1; pp. 44 - 50
• Main Authors: ROUXEL, T, BESSON, J.-L, FARGEOT, D, HAMPSHIRE, S
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier 01.09.1994
• Subjects: Condensed matter: structure, mechanical and thermal properties; Elasticity, elastic constants; Equations of state, phase equilibria, and phase transitions; Exact sciences and technology; Glass transitions; Mechanical and acoustical properties of condensed matter; Mechanical properties of solids; Physics; Specific phase transitions; Viscosity; Inorganic compounds; Creep; Transition element compounds; Aluminium compounds; Glass; Elasticity; Oxides; Structure relaxation; Heat treatments; Young modulus; Silicon compounds; Time dependence; Nitrides; Dilatometry; Multi-element compounds; Yttrium compounds; Raman effect; Glass transformations; Bending; Microstructure; Ultrasonic method
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/0022-3093(94)90313-1

Ultrasonic echography and a three-point bending creep test have been used to study the change in Young's modulus, E, and viscosity, eta , during the structural relaxation of a SiYAlON glass at 870 deg C, i.e. 40 deg C below the glass transition temperature. The increase in viscosity has been discussed and modelled in the frame of the fictive temperature theory and a relatively good fitting has been obtained between calculation and experimental results. In addition to the evolution of E and eta , Raman scattering measurements are presented, which brings to light a microstructural change during the relaxation process.