Thermodynamics, Kinetics, and Crystallization of Pt57.3Cu14.6Ni5.3P22.8 Bulk Metallic Glass Forming Alloy
Author: Benjamin A. Legg
Publisher:
Published: 2006
Total Pages: 138
ISBN-13:
DOWNLOAD EBOOKThis study utilizes differential scanning calorimetry (DSC) to characterize the thermodynamics, kinetics and crystallization b processes of a new Pt57.3Cu14.6Ni5.3P22.8 bulk metallic glass forming alloy. The heat capacity of the alloy is measured for the crystalline, glassy, and supercooled liquid phases. This data is used to obtain thermodynamic driving forces for crystallization and quantify the thermodynamic fragility. Kinetic properties of the alloy are investigated by observing the glass transition under different heating rates. The heating rate dependence of the glass transition is then used to calculate the kinetic fragility and estimate how the material's viscosity varies with temperature. DSC is also used to observe the crystallization event at variety of temperatures and generate a Time-Temperature-Transformation (TTT) diagram for crystallization. The crystallization results and TTT diagram are compared with thermodynamic and kinetic data using classical nucleation theory, and different models for crystallization are discussed.