Kink bands promote exceptional fracture resistance in a NbTaTiHf refractory medium-entropy alloy

David H. Cook; Punit Kumar; Madelyn I. Payne; Calvin H. Belcher; Pedro P.P.O. Borges; Wenqing Wang; Flynn Walsh; Zehao Li; Arun Devaraj; Mingwei Zhang; Mark Asta; Andrew M. Minor; Enrique J. Lavernia; Diran Apelian; Robert O. Ritchie

doi:10.1126/science.adn2428

Abstract

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Single-phase body-centered cubic (bcc) refractory medium- or high-entropy alloys can retain compressive strength at elevated temperatures but suffer from extremely low tensile ductility and fracture toughness. We examined the strength and fracture toughness of a bcc refractory alloy, NbTaTiHf, from 77 to 1473 kelvin. This alloy's behavior differed from that of comparable systems by having fracture toughness over 253 MPa·m

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