Experimental analysis to the structural relaxation of Ti48Zr20V12Cu5Be15 metallic glass matrix composite
Résumé
The mechanical relaxation characteristics of in-situ Ti48Zr20V12Cu5Be15 metallic glass matrix composite with dendrites reinforced are investigated by using mechanical spectroscopy. An abnormal internal friction behavior below the glass transition temperature is detected. Considering the irreversible feature and based on the transmission electron microscopy analysis, the abnormal internal friction behavior is mainly induced by the precipitation of nanocrystals in the dendritic phase. In order to understand better the dynamic mechanical properties of the Ti48Zr20V12Cu5Be15 metallic glass matrix composite, the kinetic characteristics of glass transition are analyzed in the framework of quasi-point defects theory. In addition, an isothermal annealing conducted at lower than the glass transition temperature induces a significant change on both modulus and loss factor, the kinetics of relaxation under annealing can be well described by the stretched exponential relaxation equation. © 2018 Elsevier B.V.
Mots clés
Beryllium alloys
Copper alloys
Dynamic mechanical analysis
Glass
High resolution transmission electron microscopy
Internal friction
Isothermal annealing
Metallic glass
Metallic matrix composites
Metals
Point defects
Structural relaxation
Temperature
Titanium alloys
Transmission electron microscopy
Vanadium alloys
Zirconium alloys
Dendritic phase
Dynamic mechanical property
Experimental analysis
Kinetic characteristics
Mechanical spectroscopy
Metallic glass matrix composite
Stretched exponential relaxations
Transmission electron
Glass transition