Influence Of Cr/Ni Ratio On The Formation Of C14 Phases In A Ti7Nb6Cr(4-x)Ni(1+x)VAl Refractory High Entropy Alloy

Authors:

Juan Cornide (1), Manuel Parra-Martínez (1), Daniel Cuenca-Fernandez (1), Emilio Frutos (1)

1- Department of Chemical and Materials Engineering, Faculty of Chemistry, Complutense University of Madrid (UCM), Madrid, Spain

Abstract:

Refractory Eutectic High Entropy Alloys (RHEAs) with body-centered cubic (BCC) single-phase structures have attracted extensive attention in hydrogen storage due to their unique structural characteristics and excellent performance. A general observation shows that BCC structures form more stable hydrides than Laves phase-based hydrides. In the present study, several Ti7Nb6Cr4-xNi(1+x)VAl (x=0,2) RHEAs obtained by high-energy mechanical alloying were investigated to understand the influence of the Chromium/Nickel ratio on the transition from BCC and C14 Laves phase into a single BCC phase. The research was conducted through SEM and X-ray diffraction analysis. Additionally, several thermodynamic parameters such as the enthalpy of mixing (ΔHmix), size difference (δ), valence electron concentrations (VEC), and electrons per atom ratio (e/a) have been correlated with the experimental data.

DOI:

https://doi.org/10.59499/EP246282478