Microstructure and Room Temperature Properties of a High-Entropy TaNbHfZrTi Alloy (Postprint)

A new refractory alloy, Ta20Nb20Hf20Zr20Ti20, produced by vacuum arc-melting followed by hot isostatic pressing (HIPing) at T = 1473K and P = 207MPa for 3 h has predominantly a single-phase body-centered cubic (BCC) structure with the lattice parameter a = 340.4 pm. The alloy density and Vickers mic...

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Bibliographische Detailangaben
Hauptverfasser: Miracle, D B, Woodward, C F, Senkov, O N, Scott, J M, Senkova, S V
Format: Report
Sprache:eng
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Zusammenfassung:A new refractory alloy, Ta20Nb20Hf20Zr20Ti20, produced by vacuum arc-melting followed by hot isostatic pressing (HIPing) at T = 1473K and P = 207MPa for 3 h has predominantly a single-phase body-centered cubic (BCC) structure with the lattice parameter a = 340.4 pm. The alloy density and Vickers microhardness are p = 9.94 g/cm3 and Hv = 3826 MPa. The alloy has high compression yield strength (o0 2 = 929 MPa) and ductility ( 50%). The alloy shows considerable strain hardening and homogeneous deformation. A simple model of solid-solution strengthening is proposed to explain the behavior. Prepared in collaboration with UES Inc., Dayton, OH. Published in the Journal of Alloys and Compounds, v509 p6043-6048, 2011.