High-entropy alloys as high-temperature thermoelectric materials
Journal article, 2015

Thermoelectric (TE) generators that efficiently recycle a large portion of waste heat will be an important complementary energy technology in the future. While many efficient TE materials exist in the lower temperature region, few are efficient at high temperatures. Here, we present the high temperature properties of high-entropy alloys (HEAs), as a potential new class of high temperature TE materials. We show that their TE properties can be controlled significantly by changing the valence electron concentration (VEC) of the system with appropriate substitutional elements. Both the electrical and thermal transport properties in this system were found to decrease with a lower VEC number. Overall, the large microstructural complexity and lower average VEC in these types of alloys can potentially be used to lower both the total and the lattice thermal conductivity. These findings highlight the possibility to exploit HEAs as a new class of future high temperature TE materials.

Author

Samrand Shafeie

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Sheng Guo

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Q. Hu

Jiangxi Academy of Sciences

H. Fahlquist

Bruker AXS Nordic AB

Paul Erhart

Chalmers, Applied Physics, Materials and Surface Theory

Anders Palmqvist

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Applied Surface Chemistry

Journal of Applied Physics

0021-8979 (ISSN) 1089-7550 (eISSN)

Vol. 118 18 184905

Subject Categories

Metallurgy and Metallic Materials

Areas of Advance

Materials Science

DOI

10.1063/1.4935489

More information

Created

10/7/2017