Mechanical Properties of Nb25Mo25Ta25W25 and V20Nb20Mo20Ta20W20 Refractory High-Entropy Alloys (Preprint)
Journal article preprint
AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIR METALS CERAMICS AND NONDESTRUCTIVE EVALUATION DIV/METALS BRANCH
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Two refractory high entropy alloys with concentrations near Nb25Mo25Ta25W25 and V20Nb20Mo20Ta20W20, were produced by vacuum arc-melting. Despite containing many constituents both alloys had a single-phase body-centered cubic BCC structure that remained stable after exposure to 1400 deg C. Compression properties of the alloys were determined in the temperature range of room temperature to 1600 deg C. Limited compressive plasticity and quasi-cleavage fracture at room temperature suggests that the ductile-to-brittle transition for these alloys occurs above room temperature. At 600 deg C and above, both alloys showed extensive compressive plastic strain. The yield strength dropped by 30-40 between room temperature and 600 deg C, but was relatively insensitive to temperature above 600 deg C . The yield strength values of both alloys were high over the entire temperature range relative to conventional superalloys.
- Properties of Metals and Alloys