Thermodynamics, Kinetics And Glass Forming Ability Of CeGaCu Amorphous Alloys

We have learnt the heat capacity and crystallization driving force of CeGaCu metallicglasses. Ce70Ga6Cu24has been taken as an example. Basic parameters such as melting point,melting enthalpy, excess heat capacity have been measured on DSC. Basic thermodynamicproperties have been fitted and calculated. The role of driving force in glass formingprocess has also been discussed. Utilizing isothermal DSC experiment, the crystallizationbehavior was learnt. The crystallization mechanism and apparent crystallization have beencalculated and discussed. The nucleation and growth activation energies were calculatedspecifically. The relatively larger energy barrier for nucleating was believed to beresponsible for the excellent GFA of Ce70Ga6Cu24. In order to indicate the crucial factors ofGFA, parameters γ, F1and Wang’s criterion were learnt. Strong glass forming liquids suchas Ce-, La-and Ga-based alloys were believed to be special in structure that differs fromother alloys in crystallization. We also measured and caulculated some basicthermophysical properties and TTT diagram of Ce70GaxCu30-x(x=4,6,10,12,15) alloys.Considering both thermodynamic kinetic and structural properties, the relationship betweenthermodynamics and kinetics were demonstrated. TTT diagram were fitted to indicate thereal glass forming ability of Ce70Ga10Cu20. In order to indicate the influence of eachproperty in the contribution of glass forming ability, these properties were learnt inchanging the TTT diagram.