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EXFOLIATION CORROSION BEHAVIORS OF Al-Cu-Li-(Sc+Zr)ALLOY

LU Cong-ge

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Abstract

Exfoliation corrosion behavior of Al-Cu-Li-(Sc+Zr)alloy with different aging treatment schemes were studied.The results show that the naturally-aged alloy has the best exfoliation corrosion resistance.The exfoliation corrosion are accelerated with prolonging the aging time at 160℃.Microstructure observations showed that the main precipitate of alloy is T1 phase.With increasing the aging time,T1 phase coarsened, and precipitate-free-zone(PFZ)and equilibrium phases were observed along grain boundaries.The exfoliation corrosion behaviors of Al-Cu-Li-(Sc+Zr)alloys were investigated through TEM.It is shown that T1 phase and PFZ are the main factors for the exfoliation corrosion behavior of the alloy.The corrosion of the alloy begins with the dissolution of T1 followed by the dissolution of PFZ.

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What this paper is about

Exfoliation corrosion behavior of Al-Cu-Li-(Sc+Zr)alloy with different aging treatment schemes were studied.The results show that the naturally-aged alloy has the best exfoliation corrosion resistance.The exfoliation corrosion are accelerated with prolonging the aging time at 160℃.Microstructure observations showed that the main precipitate of alloy is T1 phase.With increasing the aging time,T1 phase coarsened, and precipitate-free-zone(PFZ)and equilibrium phases were observed along grain boundaries.The exfoliation corrosion behaviors of Al-Cu-Li-(Sc+Zr)alloys were investigated through TEM.It is shown that T1 phase and PFZ are the main factors for the exfoliation corrosion behavior of the alloy.The corrosion of the alloy begins with the dissolution of T1 followed by the dissolution of PFZ.

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Available abstract

Exfoliation corrosion behavior of Al-Cu-Li-(Sc+Zr)alloy with different aging treatment schemes were studied.The results show that the naturally-aged alloy has the best exfoliation corrosion resistance.The exfoliation corrosion are accelerated with prolonging the aging time at 160℃.Microstructure observations showed that the main precipitate of alloy is T1 phase.With increasing the aging time,T1 phase coarsened, and precipitate-free-zone(PFZ)and equilibrium phases were observed along grain boundaries.The exfoliation corrosion behaviors of Al-Cu-Li-(Sc+Zr)alloys were investigated through TEM.It is shown that T1 phase and PFZ are the main factors for the exfoliation corrosion behavior of the alloy.The corrosion of the alloy begins with the dissolution of T1 followed by the dissolution of PFZ.

Key concepts: Materials science, Alloy, Exfoliation joint, Corrosion, Dissolution, Metallurgy, Microstructure, Phase (matter)

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