Thermal stability and crystallization kinetics of Ti_(40)Zr_(10)Cu_(34)Pd_(14)Sn_2 bulk metallic glass

摘要

In this work, the isochronal and isothermal activation energies for the primary crystallization process of Ti_(40)Zr_(10)Cu_(34)Pd_(14)Sn_2 bulk metallic glass have been studied by differential scanning calorimetry and determined using the Kissinger approach and the Johnson-Mehl-Avrami analysis, respectively. The activation energy for crystallization evaluated by the Kissinger method is 253 kJ/mol. Similar activation energy for crystallization was obtained from the viscosity measurements. The values of the differential Avrami exponent are also determined from the isothermal data. Assuming diffusion-controlled growth, it is shown that thermal treatment of the samples in the supercooled liquid region considerably influences the behavior of the nucleation rate during the crystallization process.