Thermal conductivity calculation of Fe-Al-Ni alloys by CALPHAD method

Abstract

The Fe-Al-Ni alloys are widely used in the thermal management systems of electronic devices and the production of electromagnetic components because of their high heat dissipation characteristics. In this work, the thermal conductivity of the Fe-Al-Ni system was evaluated by means of CALPHAD (CALculation of PHAse Diagrams) method. The thermal conductivity of solid solutions was described using Redlich-Kister interaction parameters. For alloys in a two-phase region, an interface thermal resistance parameter was introduced into the model to account for the impedance of interfaces on heat transfer. The corresponding parameters for the pure element, binary and ternary systems were optimized, which enables the modeling exhibit good consistency with the experimental data. This work is helpful for predicting the thermal conductivity of Fe-Al-Ni alloys system during the industrial production process and provide key thermophysical properties for microstructure and processing simulations.