Phase transformation from Mg to MgH2 studied by SEM metallography

Amelia Montone, Annalisa Aurora, Daniele Mirabile Gattia, Marco Vittori Antisari

Research output: Contribution to conferencePaper

Abstract

Metallographic information has been used to support the kinetic analysis and the relative experimental findings in the phase transformation from Mg to MgH2, by absorption of hydrogen gas. In particular the method provides to be able to provide detailed information on the role of localized features like catalyst particles and defects present in the sample, which is obtained from ball milled MgH2 enriched with 5wt% Fe. In this work we have compared the kinetics of the hydrogenation reaction carried out at two different temperatures while keeping constant the thermodynamic force driving the reaction. This last was achieved by carefully controlling the hydrogen gas pressure. Despite this fact, the sample microstructure shows a marked effect of the temperature on the nucleation mechanism. In particular we have noticed that the density of sites active for nucleation is higher at lower temperature. Instant nucleation deduced by the kinetic analysis was confirmed by comparing the microstructure of samples at different reaction stages. © 2010 Materials Research Society.
Original languageEnglish
Publication statusPublished - 2010
Externally publishedYes
Event2009 MRS Fall Meeting - , United States
Duration: 1 Jan 2010 → …

Conference

Conference2009 MRS Fall Meeting
CountryUnited States
Period1/1/10 → …

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Montone, A., Aurora, A., Gattia, D. M., & Antisari, M. V. (2010). Phase transformation from Mg to MgH2 studied by SEM metallography. Paper presented at 2009 MRS Fall Meeting, United States.