Abstract

C addition (2 wt%) to MoSi2 acted as a deoxidant, removing the otherwise ubiquitous siliceous grain boundary phase in hot‐pressed samples, and causing formation of SiC and Mo5Si3C1 (a variable‐composition Nowotny phase). Both hardness and fracture toughness of the C‐containing alloy were higher than those of the C‐free (and oxygen‐rich) material; more significantly, the fracture toughness of the MoSi2+ 2% C alloy increased from 5.5 MPa·m1/2 at 800°C to ∼11.5 MPa·m1/2 at 1400°C.

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