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Erschienen in:
2016 | OriginalPaper | Buchkapitel
Precipitates in Long Term Aging Al 5083 Alloy
verfasst von : Gaosong Yi, Yakun Zhu, David A. Cullen, Alexander T Derrick, Michael L. Free
Erschienen in: Light Metals 2014
Verlag: Springer International Publishing
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Al 5083 alloy aged at 343 K (70 °C) for 3–30 months was evaluated by high resolution transmission electron microscopy (HRTEM) results show that both thickness and continuity of β phase formed at grain boundaries increase with time. GP zones are observed in Al 5083 aged at 343 K for 3 months for the first time. TEM results reveal that GP zones can form homogeneously with the help of vacancies as well as heterogeneously at dislocations near grain boundaries, and the mechanism are explained in detail. Mg2Si precipitate was found to form at the grain boundary and energy-dispersive X-ray spectroscopy (EDS) results reveal that a Mg, Si (atomic ratio 1:1) rich phase nucleates at the interface of Mg2Si-matrix. β’ phase(Al3Mg2, hexagonal) is observed to form at grain boundaries of Al 5083 alloy aged at 343 K for 30 months. β phase was found at the grain boundary of Al 5083 aged at 343 K for 12 months using EDS.