Structural characterization and hydrogen storage properties of the Ti31V26Nb26Zr12M5 (M 1/4 Fe, Co, or Ni) multi-phase multicomponent alloys

卷:48

Article

关键词: HIGH-ENTROPY ALLOYS;    MICROSTRUCTURE;    ABSORPTION;    SORPTION;   

DOI  :  10.1016/j.ijhydene.2022.10.060

来源: SCIE

【 摘 要 】

Structure and hydrogen storage properties of three Ti31V26Nb26Zr12M5 multicomponent alloys with M = Fe, Co and Ni are investigated. The alloys synthesized by arc melting are characterized via X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). The as-cast ingots present multi-phase dendritic structures composed mainly of BCC phases and small amounts of C14 Laves phases. Upon hydrogenation, each alloy absorbs around 1.9 H/ M (number of hydrogen atoms per metal atoms) at room temperature. XRD of fully hy-drogenated samples shows the formation of multi-phase structures composed of FCC and C14 hydrides. Thermo Desorption Spectroscopy (TDS) shows that the hydrogenated alloys present multi-step desorption processes with wide temperature ranges and low onset temperatures. XRD of partially hydrogenated samples indicate the presence of interme-diate BCC hydrides. XRD of desorbed samples suggest reversible reactions of absorption/ desorption: BCC + C14 alloy 4 intermediate BCC hydride + C14 hydride 4 FCC + C14 hydrides. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

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