Mechanical Properties of Nb25Mo25Ta25W25 and V20Nb20Mo20Ta20W20 Refractory High-Entropy Alloys (Preprint)
Abstract
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 2011
- Accession Number
- ADA550865
Entities
People
- Daniel Miracle
- G. B. Wilks
- J. M. Scott
- Oleg N. Senkov
Organizations
- Air Force Research Laboratory