Improvement of Mechanical Properties with Non-Equimolar CrNbTaVW High Entropy Alloy

CrNbTaVWx with (x = 1 and 1.7) high entropy alloys have been devised for thermal barriers between the plasma-facing tungsten tiles copper-based heat sink in first wall of fusion nuclear reactors. These novel materials were prepared by ball milling consolidated Upgrade Field Assisted Sintering Technology at 1873 K under an applied pressure 90 MPa 10 min. In this work, structural mechanical properties these evaluated. Consolidated samples presented a major phase bcc-type structure lattice parameter value 0.316 nm CrNbTaVW CrNbTaVW1.7 compositions. Moreover, observation microstructures evidences also two minor phases: Ta-Nb-Cr Ta-V rich (in which carbon is detected). Despite similarity alloys, their are distinct. The flexural stress sample higher amount W (CrNbTaVW1.7) 50% 298–873 range, increased strain to fracture, can be associated reduced brittleness caused additional incorporation.