Formation of twinned tetragonal ferromagnetic L10 - MnAl-C

A. S. Sologubenko, P. Müllner, H. Heinrich, G. Kostorz

Research output: Contribution to journalArticlepeer-review

Abstract

The plate-like modification of the τ-MnAl-C (L10-structure) is a promising material for magnetoplastic applications. The formation of the metastable plate-like τ from the supercooled high- temperature ε-phase (A3-structure) is a discontinuous displacive process. It thus becomes possible to control the appearance of particular variants of the twin-related structural domains of τ at the intermediate stages of the ε → τ transformation. The displacive mechanism of the plate- like τ-formation was studied by transmission electron microscopy. The intermediate ε′-phase (B19-structure) forms from the ε-phase and transmits the crystallographic correspondence from the matrix ε to the plate-like τ. The structural domain boundaries of the intermediate ε′-phase are the nucleation sites of the plate-like τ. The crucial role of these structural domain boundaries for the formation of the plate-like τ-phase is demonstrated.

Original languageEnglish
Pages (from-to)863-867
Number of pages5
JournalArchives of Metallurgy and Materials
Volume49
Issue number4
StatePublished - 2004

Keywords

  • Displacive transformation
  • MnAl-C alloys
  • Nucleation sites
  • Structural domains

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