Calorimetric study of the crystallization kinetics of Cu 47 Ti 33 Zr 11 Ni 8 Si 1 metallic glass

摘要: The isochronal and isothermal activation energies for the primary crystallization process of ${\mathrm{Cu}}_{47}{\mathrm{Ti}}_{33}{\mathrm{Zr}}_{11}{\mathrm{Ni}}_{8}{\mathrm{Si}}_{1}$ metallic glass powders subjected to varying thermal treatments have been evaluated by differential scanning calorimetry determined using Kissinger approach Johnson-Mehl-Avrami (JMA) analysis, respectively. values Avrami exponent are also from data. Assuming diffusion-controlled growth, it is shown that treatment samples in supercooled liquid region considerably influences behavior nucleation rate during process. Microstructural investigations indicate accompanied precipitation fine nanocrystals an amorphous matrix. both JMA analysis similar as-prepared powder, but a significant difference found thermally treated powders. This discrepancy explained on basis fundamental assumptions made models. It will be method fails if changes significantly transformation