Study of the thermal stability of phases in the Mg-Al system |
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Authors: | Tomasz Czeppe Wojciech Zakulski and Elbieta Bielaska |
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Affiliation: | (1) Aleksander Krupkowski Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta St., 30-059 Kraków, Poland |
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Abstract: | A part of the Al-Mg phase diagram was studied in the range of composition between 48 and 61 at.% Al by DSC and SEM/EDS methods.
The temperature ranges of stability of the β, γ, and ɛ phases were considered. It was found that the congruent melting temperature
of the β phase was 450±1 °C. The Al content in that phase was determined to be 61±1 at.% Al at 420 °C. The upper temperature
limit of the stability of the ɛ phase was established to be 427±1 °C. The Al content changed from 54 at.% at 390 °C to 56
at.% at 420 °C. The lower temperature limit of the ɛ phase formation was not determined, as a result of a slow ɛ=β+γ reaction.
The hypothetical λ or ζ phases were not found, but it was observed that decomposition of oxides might produce extra thermal
effects. |
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