Microstructure and mechanical properties of in-situ MC-carbide particulates-reinforced refractory high-entropy Mo0.5NbHf0.5ZrTi matrix alloy composite

• Carbon was added into Mo0.5NbHf0.5ZrTi alloy to prepare metal-matrix composite.
• C0.1 and C0.3 alloys form one BCC phase and particulates-reinforced MC-carbide.
• MC carbide is enriched with Zr and Hf and without any Mo.
• The carbide formation increases compressive strength and improves plasticity.

Refractory high-entropy Mo0.5NbHf0.5ZrTi alloy matrix composite with MC-carbide particulates-reinforced was prepared by arc melting. It is found that Mo0.5NbHf0.5ZrTiC0.1 and Mo0.5NbHf0.5ZrTiC0.3 alloys consist of one disordered body-centered cubic (BCC) solid solution phase as the matrix phase and MC carbide phase. MC carbide is enriched with Zr and Hf due to the higher binding strength and without any Mo. Noticeable strengthening from the carbide is not observed for C0.1 and C0.3 alloys while the compressive plasticity is improved slightly due to the decrease of solution strengthening for the matrix BCC disordered solid solution phase.

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