Thermodynamics, kinetics, and crystallization of Pt₅₇.₃Cu₁₄.₆Ni₅.₃P₂₂.₈ bulk metallic glass forming alloy Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/2b88qh58t

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  • This 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.
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