Thermodynamic modeling of the undercooled liquid in the Ni-Zr system

Abstract

Using thermodynamic data obtained over a wide range of temperatures, a thermodynamic assessment of the Ni-Zr system was carried out. The associated solution model was applied to describe the short range ordering in the liquid, and the glass transition was treated as a second order transition, using the Hillert-Jarl functions. The driving force of crystallization, and the time-temperature-transformation (TTT) curves were estimated from the optimized parameter set, and compared with experimental data and the results of previous thermodynamic assessments. Taking into account the low temperature thermodynamic data, the calculated driving force was found to have decreased compared to the previous assessments. Consequently, the nose of the TTT curve was shifted to higher times. © 2005 The Japan Institute of Metals.