Fundamental design strategies for advancing the development of high entropy alloys for thermo-mechanical application: A critical review

• Published in: Journal of materials research and technology Vol. 27; pp. 4833 - 4860
• Main Authors: Anamu, U.S., Ayodele, O.O., Olorundaisi, E., Babalola, B.J., Odetola, P.I., Ogunmefun, A., Ukoba, K., Jen, T.-C., Olubambi, P.A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-11-2023; Elsevier
• Subjects: Fabrication processes; High-entropy alloys; Intermetallics; Materials' properties; Phase diagram calculations; Theoretical calculations; Phase diagram calculations; High-entropy alloys; Intermetallics; Materials' properties; Theoretical calculations; Fabrication processes
• ISSN: 2238-7854
• DOI: 10.1016/j.jmrt.2023.11.008

Nearly three decades since the discovery of high entropy alloys (HEAs), it has greeted a broad interest in the field of materials research as a better alternative to conventional alloy materials due to the exceptional combinatorial properties they offer in terms of lightweight, high-specific strength in elevated temperatures, excellent oxidation and corrosion resistance properties (among others). Leveraging on the “four core effects”: high-entropy effect, sluggish/hysteretic diffusion effect, severe-lattice-distortion effect and cocktail effect which define the special features responsible for their outstanding properties, HEAs have been successfully employed for high-temperature applications in automobile and in the aerospace. An emerging sub-field of HEAs is the incorporation of a secondary strengthening phase that can be provided by the precipitation of intermetallic (IM) compounds to enhance the microstructure which will concomitantly affect the properties of a material (thermal, chemical and mechanical properties) for broader engineering applications. In this article, design concepts brewed from thermo-physical parameters calculation and computational thermodynamics using a CALPHAD-based tool were reviewed as fundamental design strategies in the development of IM-containing HEAs.