Comments on the `Dislocation interaction with semicoherent precipitates (Ω phase) in deformed Al-Cu-Mg-Ag alloy'

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The strengthening model by Li and Wawner for Al alloys with {111}α precipitate plates observing the shearing of the omega (AlCu) phase in plastically-deformed samples is demonstrated to be inevitably incorrect. The model was based on the interfaces between dislocations and {111}α precipitate plates of Ω phase in AlCuMgAg alloy using the conventional and high resolution TEM. Since the Ω phase is structurally distinguishable from the phase θ, it is possible that the deformation of the Ω phase will be different from that of the θ phase. Therefore, a discrepancy is evident between the claimed [001](110)Ω slip system and the apparent {001}(100)Ω slip system ignoring the plate-like form and the effect of the aspect ratio for the strengthening.

Original languageEnglish
Pages (from-to)409-413
Number of pages5
JournalScripta Materialia
Issue number4
Publication statusPublished - 31 Jan 2000

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