Phase equilibria in the Mn-rich portion of the binary system Mn-Al

X. J. Liu, R. Kainuma, H. Ohtani, K. Ishida

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31 Citations (Scopus)


The phase equilibria in the binary Mn-Al system have been investigated over the temperature range 800 to 1200°C and the composition range 50 to 80 at.% Mn using a combination of diffusion couple techniques, optical metallography, X-ray diffraction, and differential scanning calorimetry. The results show that: (i) the ε/δ - Mn phase boundary is located at approximately 72 at.% Mn, (ii) the ε phase region is wider and extends to higher Mn content than that reported before, and (iii) the eutectoid reaction (δ-Mn → ε + β-Mn) occurs at approximately 1040°C, i.e. at a temperature higher than that previously reported (970°C). While the results from this study on the ε/γ and ε/β-Mn phase equilibria are in satisfactory agreement with the data of previous workers, the results on the ε/δ-Mn phase equilibrium differ from those reported previously. It is explained that this discrepancy may be due to the presence of the previously undetected transformation from the s to the β-Mn phase on quenching, which occurs only in the s phase alloys with Mn content over 58 at.%.

Original languageEnglish
Pages (from-to)256-261
Number of pages6
JournalJournal of Alloys and Compounds
Issue number2
Publication statusPublished - 1996 Mar 15


  • Diffusion couple
  • Magnetic alloy
  • Mn-Al phase diagram
  • Phase equilibria
  • Phase transformation

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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