A Predictive Analytical Model of Thermal Conductivity for Aluminum/Transition Metal High Entropy Alloys

Authors

M. J. Abere
E. Ziade
P. Lu
C. B. Saltonstall
Xiaojun Gu, Bucknell University
Wendelin WrightFollow
N. Argibay
A. B. Kustas

Publication Date

2022

Description

A predictive analytical model for the thermal conductivity of aluminum/transition metal based high-entropy alloys based on contributions from the electron and lattice subsystems is presented. Lattice conductivity is modeled as an oscillator damped by electron-phonon and defect scattering. Electron subsystem conductivity is dominated by scattering from the aperiodic crystal potential arising from alloying atom induced lattice disorder; its effect was quantitatively calculated using a virtual crystal approximation. We show that model predictions agree with published values and for an exemplar high-entropy alloy largely based on transition (i.e., non-refractory) elements, Al_xCoCrCu_yFeNi. Within this alloy system, the crystal structure varies between face centered cubic and body centered cubic depending on composition and temperature, and it was found that thermal conductivity behaves as a weighted-average composite of the multiple phases.

Journal

Scripta Materialia

Volume

208

First Page

114330

Department

Mechanical Engineering

DOI

10.1016/j.scriptamat.2021.114330

Recommended Citation

Abere, M. J.; Ziade, E.; Lu, P.; Saltonstall, C. B.; Gu, Xiaojun; Wright, Wendelin; Argibay, N.; and Kustas, A. B.. "A Predictive Analytical Model of Thermal Conductivity for Aluminum/Transition Metal High Entropy Alloys." (2022) : 114330.