Abstract

Refractory niobium alloys with low density are widely studied as high-temperature structural components, but they suffer from high-temperature softening or room-temperature brittleness. This paper provides a Nb2MoWC0.7 hypoeutectic alloy with excellent strength and plasticity with a high engineering yield strength of 1.47 GPa, compressive strength of 1.95 GPa, and plastic strain of 10.6%. A large amount of primary soft BCC improve the room-temperature plasticity, while eutectic structures with semi-coherent BCC/NbC interface enhance strength mainly by interfacial-dependent strengthening.

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