Novel processing route for the fabrication of bulk high-entropy metal diborides

TALLARITA, GIOVANNA

First

;Licheri, Roberta

Second

;Garroni, Sebastiano;Orrù, Roberto

;Cao, Giacomo

Last

2019-01-01

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Abstract

A single high-entropy phase material with hexagonal structure is produced by a two-steps processing method. Elemental reactants are first remarkably converted by Self-propagating High-temperature Synthesis (SHS). The completion of the chemical transformation to the desired (Hf0.2Mo0.2Ta0.2Nb0.2Ti0.2)B2 phase and its concurrent consolidation up to 92.5% relative density is achieved by processing the SHS powders at 1950 °C via Spark Plasma Sintering. It is clearly evidenced that the use of the SHS technique is extremely beneficial to promote the formation of high-entropy ceramics, as compared to the time consuming ball milling treatment alternatively adopted.