Influence of magnesium addition on the mechanical and corrosion responses of 7249 aluminum alloy

Adeosun, S.O. ; Sekunowo, I.O. ; Balogun, S.A. ; Oladoye, A.M. ; Osoba, L.O. (2010-11)

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Article

The effects of 1.8-2.6% Magnesium addition on the mechanical and corrosion responses of 7249 aluminum alloy have been studied. Samples of the alloy in as-cast, T6 and RRA forms were made and subjected to tensile and hardness tests. Exfoliation, ferric-chloride and immersion corrosion analyzes were also carried out on the alloy forms. The results show that strength and hardness increased at the expense of ductility as the Mg content is increased to 2.6 %. RRA form exhibited the best tensile and hardness properties coupled with superior corrosion resistance. This characteristic behaviour of RRA form is predicated on the precipitation of coherent and stable equilibrium MgZn2 phase.