Skip to main content
SpringerLink
Log in

Phase Transformation from Mg to MgH2 Studied by SEM Metallography

  • Published:
MRS Online Proceedings Library Aims and scope

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 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.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. M. Vittori Antisari, A. Montone A. Aurora M.R. Mancini D. Mirabile Gattia, L. Pilloni Intermetallics 17 249 (2009).

    Article  Google Scholar 

  2. J. Cazaux, Scanning 26 181 (2004).

    Article  Google Scholar 

  3. P.S. Rudmann J. Appl. Phys. 50 7195 (1979).

    Article  Google Scholar 

  4. A. Montone M. Vittori Antisari, Micron, 34 79 (2003).

    Article  CAS  Google Scholar 

  5. J. Avrami J. Chem. Phys. 7 1103 (1939); J. Avrami J. Chem. Phys. 8 212 (1940); J. Avrami J. Chem. Phys. 9 177 (1941).

    Article  CAS  Google Scholar 

  6. M. Mintz Y. Zeiri J. Alloys Comp., 216 159 (1994).

    Article  Google Scholar 

  7. A.T. Kempen F. Sommer E.J. Mittemmeeija J. Mater. Sci., 37 1321 (2002).

    Article  CAS  Google Scholar 

  8. M. Vittori Antisari, A. Aurora D. Mirabile Gattia, A. Montone Scripta Materialia 61 (11), 1064 (2009).

    Article  CAS  Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Research Center of Casaccia, Via Anguillarese, 301, 00123, Rome, Italy

    Amelia Montone, Annalisa Aurora, Mirabile Gattia Daniele, Vittori Antisari Marco & Enea Matcomp

Authors
  1. Amelia Montone
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Annalisa Aurora
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Mirabile Gattia Daniele
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. Vittori Antisari Marco
    View author publications

    You can also search for this author in PubMed Google Scholar

  5. Enea Matcomp
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

Montone, A., Aurora, A., Daniele, M.G. et al. Phase Transformation from Mg to MgH2 Studied by SEM Metallography. MRS Online Proceedings Library 1216, 509 (2009). https://doi.org/10.1557/PROC-1216-W05-09

Download citation

  • Received:

  • Accepted:

  • Published:

  • DOI: https://doi.org/10.1557/PROC-1216-W05-09

Search

Navigation