The precipitate strengthening phases in AA2024-T62 have been investigated by TEM and HREM.It has been found that S' phase coexists with an ordered structore surrounded by strain field.The corresponding OFT analysis proves that the ordered structure produces additional diffraction spots.The aging process and aging mechanism of the A1-Cu-Mg Alloy have been discussed, Unlike current view，the aging process and growing process of S' phase can be described as follows:1.G.(1)G.P(2)S'+co-existing ordered structureS'+SS.2.Strain fieldCu,Mg atoms richco-existing ordered structureS'.
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References
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