|About this Abstract
||1st World Congress on High Entropy Alloys (HEA 2019)
||High Entropy Alloys 2019
||Hydrogen Storage Properties of TiVNbCrx Multicomponent Alloys
||Renato Belli Strozi, Guilherme Zepon, Jacques Huot, Walter Botta, Daniel Leiva
|On-Site Speaker (Planned)
||Renato Belli Strozi
The effect of chromium content on the hydrogen storage properties in the TiVNbCrx (where x = 1.61, 1.0 and 0.53) multi-principal element alloys (MPEAs) was studied. CALPHAD calculation showed a relatively large BCC single-phase field since the solidification to approximately 1000C°. The alloys were synthesized by arc-melting and characterized by X-ray diffraction and scanning electron microscopy. The hydrogen storage properties were measured using Sieverts-type apparatus. The as-cast samples presented microstructures composed of BCC, HCP Titanium rich phase and C15 Laves phase. The three alloys absorbed hydrogen rapidly under mild conditions, i.e., room temperature and 2.0 MPa of H2. XRD analysis after first hydrogenation showed that the C15 Laves phase not absorbed hydrogen and the BCC phase absorbed hydrogen by forming FCC hydride. Increasing of Cr content increases the amount of C15 Laves phase but the gravimetric hydrogen capacity decreases.