articleScientific ReportsNov 29, 2016GOLD OA

High-Entropy Metal Diborides: A New Class of High-Entropy Materials and a New Type of Ultrahigh Temperature Ceramics

University of California San Diego · University of California, Berkeley

PubMed
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Abstract

Abstract Seven equimolar, five-component, metal diborides were fabricated via high-energy ball milling and spark plasma sintering. Six of them, including (Hf 0.2 Zr 0.2 Ta 0.2 Nb 0.2 Ti 0.2 )B 2 , (Hf 0.2 Zr 0.2 Ta 0.2 Mo 0.2 Ti 0.2 )B 2 , (Hf 0.2 Zr 0.2 Mo 0.2 Nb 0.2 Ti 0.2 )B 2 , (Hf 0.2 Mo 0.2 Ta 0.2 Nb 0.2 Ti 0.2 )B 2 , (Mo 0.2 Zr 0.2 Ta 0.2 Nb 0.2 Ti 0.2 )B 2 , and (Hf 0.2 Zr 0.2 Ta 0.2 Cr 0.2 Ti 0.2 )B 2 , possess virtually one solid-solution boride phase of the hexagonal AlB 2 structure. Revised Hume-Rothery size-difference factors are used to rationalize the formation of high-entropy solid solutions in these metal diborides. Greater than 92% of the theoretical densities have been generally achieved…

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