Phase formation behavior and hydrogen sorption characteristics of TiFe0.8Mn0.2 powders prepared by gas atomization

Da Hye Lee, Hong Gi Kwon, Ki Beom Park, Hyeon Tae Im, Ryun Ho Kwak, Seok Su Sohn, Hyung Ki Park, Julien O. Fadonougbo

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

In this article we have investigated the phase formation behavior and hydrogen storage characteristics of TiFe0.8Mn0.2 samples produced by electrode induction melting gas atomization (EIGA) as well as conventional vacuum arc-melting (VAM). TiFe (46Ti–46Fe–8Mn (wt%) with cubic, CsCl-type structure) and C14 Laves (37Ti–51Fe–12Mn (wt%) with hexagonal, MgZn2-type structure) phases were detected in both atomized powders and crushed ingots, the latter possessing a lower fraction of Laves phase. Microstructural characterization included electron probe micro-analysis (EPMA) and transmission electron microscopy (TEM), which evidenced the existence of a non-equilibrium Ti2Fe phase in the atomized powders. The formation of this additional secondary phase was attributed to the rapid cooling rate during powder manufacturing, based on earlier findings and phase formation thermodynamic calculations combined with Scheil solidification simulations. In addition, kinetics and pressure-composition isotherms (PCIs) were acquired to determine both absorption and desorption enthalpy/entropy, as well as to study the influence of the synthesis route (and hence the resulting microstructure) on kinetics, thermodynamics and reaction mechanisms of the TiFe0.8Mn0.2 alloy.

Original languageEnglish
Pages (from-to)27697-27709
Number of pages13
JournalInternational Journal of Hydrogen Energy
Volume48
Issue number71
DOIs
Publication statusPublished - 2023 Aug 19

Bibliographical note

Publisher Copyright:
© 2023 Hydrogen Energy Publications LLC

Keywords

  • Gas atomization
  • Microstructural analysis
  • Pressure-composition isotherms
  • Scheil solidification
  • TiFe-Based hydrogen storage materials

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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