Microstructure and Hydrogen Absorption Properties of a BCC Phase Accompanied Laves Alloy

Yunlong Zhang, Tiebang Zhang, Jinshan Li, Ruolin Li, Yun Yu, Yalin Lu

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

A non-stoichiometry Zr0.7Ti0.4V1.5Cr0.4 alloy has been synthesized by arc melting following annealing treatment or melt-spinning to obtain the bulk and ribbon samples, respectively. XRD investigation reveals the multiphase structure consisting of C15-Laves, V-BCC and a small amount of α-Zr or Zr3V3O. The alloy shows easy activation and fast hydrogenation kinetics. The annealed alloy absorbs 2.51 wt% H at room temperature, higher than the melt-spun ribbons. Refined grains by melt-spinning accelerates the hydrogenation of bulk alloy. The absorption behavior in presence of 1 mol% air has been tested to evaluate the anti-poisoning ability. Pressure–composition–temperature characteristics and thermodynamics parameters indicate the low equilibrium pressure and high hydrides stability. Hydrides investigation reveals that the Laves phase dominant multiphase structure contributes to the enhanced hydrogen capacity and multi-stage hydrogen release in DSC curve.

Original languageEnglish
Pages (from-to)814-820
Number of pages7
JournalMetals and Materials International
Volume25
Issue number3
DOIs
StatePublished - 1 May 2019

Keywords

  • BCC phase
  • Hydrogen absorption
  • Laves phase
  • Melt-spun
  • Zr-based alloy

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