Precipitation of the ω phase in 2024 and 2124 aluminium alloys

It is shown that Omega phase can form in 2000 series commercial 2024 and 2124 alloys which were solution treated and directly quenched to various aging temperatures (200, 250, 300 deg C) or air cooled to room temperature. The Omega phase nucleated heterogeneously on Mn contaiing dispersoids. Differe...

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Veröffentlicht in:	Scripta materialia 1999-07, Vol.41 (4), p.391-396
Hauptverfasser:	Wang, L.M., Flower, H.M., Lindley, T.C.
Format:	Artikel
Sprache:	eng
Schlagworte:	Ageing Aluminium alloys Applied sciences Cross-disciplinary physics: materials science rheology Exact sciences and technology Materials science Metals. Metallurgy Phase diagrams and microstructures developed by solidification and solid-solid phase transformations Phase transformations Physics Precipitation Solid-phase precipitation Transmission electron microscopy (TEM)
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Zusammenfassung:	It is shown that Omega phase can form in 2000 series commercial 2024 and 2124 alloys which were solution treated and directly quenched to various aging temperatures (200, 250, 300 deg C) or air cooled to room temperature. The Omega phase nucleated heterogeneously on Mn contaiing dispersoids. Differences in Fe and Si content between 2024 and 2014 do not influence the Omega precipitation. The above study confirms that Ag is not required for precipitation of Omega in Al-Cu-Mg alloys. The results suggest that Omega is a thermodynamically stable phase in the Al-Cu-Mg system in the composition range of 2024 and 2124 alloys but is difficult to nucleate compared to S' which dominates the main structure after commercial heat treatments.
ISSN:	1359-6462 1872-8456
DOI:	10.1016/S1359-6462(99)00150-5