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

J. F. Nie; B. C. Muddle

doi:10.1016/S1359-6462(99)00345-0

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

J. F. Nie, B. C. Muddle

Materials Science & Engineering

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20 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	409-413
Number of pages	5
Journal	Scripta Materialia
Volume	42
Issue number	4
DOIs	https://doi.org/10.1016/S1359-6462(99)00345-0
Publication status	Published - 31 Jan 2000

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

abstract = "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.",

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Y1 - 2000/1/31

N2 - 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.

AB - 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.

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