Anisotropic Thermal Expansion in High-Entropy Multicomponent Alb2-Type Diboride Solid Solutions
High-entropy (HE) ultra-high temperature ceramics have the chance to pave the way for future applications propelling technology advantages in the fields of energy conversion and extreme environmental shielding. Among others, HE diborides stand out owing to their intrinsic anisotropic layered structure and ability to withstand ultra-high temperatures. Herein, we employed in-situ high-resolution synchrotron diffraction over a plethora of multicomponent compositions, with four to seven transition metals, with the intent of understanding the thermal lattice expansion following different composition or synthesis process. As a result, we were able to control the average thermal expansion (TE) from 1.3 x 10−6 to 6.9 x 10−6 K−1 dependingon the combination of metals, with a variation of in-plane to out-of-plane TE ratio ranging from 1.5 to 2.8.
F. Monteverde et al., "Anisotropic Thermal Expansion in High-Entropy Multicomponent Alb2-Type Diboride Solid Solutions," International Journal of Extreme Manufacturing, vol. 5, no. 1, article no. 015505, Institute of Physics - IOP Publishing, Mar 2023.
The definitive version is available at https://doi.org/10.1088/2631-7990/acabee
Materials Science and Engineering
Keywords and Phrases
Anisotropic Thermal Expansion; Borides; High-Entropy Ceramics; Spark Plasma Sintering; Synchrotron Diffraction; Ultra-High Temperature Ceramics
International Standard Serial Number (ISSN)
Article - Journal
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01 Mar 2023
National Science Foundation, Grant CMMI-1902069