Microstructure and Room Temperature Properties of a High-Entropy TaNbHfZrTi Alloy (Preprint)
AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
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A refractory alloy, Ta20Nb20Hf20Zr20Ti20, was produced by vacuum arc-melting. The as-solidified alloy had a dendritic structure, which was not affected by hot isostatic pressing HI Ping conducted at T 1200 deg C and p 207 MPa for 3 hours. The alloy had a single-phase body-centered cubic BCC structure with the lattice parameter a 340.44 pm. The alloy density and Vickers microhardness after HIPing were p 9.94 gcm3 and Hv 3826 MPa. Room temperature compression testing of HIPd samples revealed excellent ductility. The samples deformed homogeneously without any evidence of cracking at least up to 50 compression strain. Continuous strengthening followed yielding at 807 MPa. A simple model of solid-solution strengthening is proposed to explain the behavior.
- Metallurgy and Metallography