Etude des premiers stades de decomposition d'un alliage AlCuMg

Cuisiat, F.; Duval, P.; Graf, R.

doi:10.1016/0036-9748(84)90177-7

Cited by 60 publications

(24 citation statements)

References 3 publications

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“…In many publications [1][2][3]8,10,21], S' and S in (SQ1) have been considered to have the same structure and the same orientation relationships with aluminium matrix (i.e. no rotation).…”

Section: Nomenclature For Type I and Type Ii S Phasementioning

confidence: 99%

“…The structure of S"/GPB2 has not been clearly confirmed. Orthorhombic [1,[3][4][5], cubic [2], tetragonal [6,7] and monoclinic [8] structures have been proposed for the S"/GPB2 structure. S phase with composition of Al 2 CuMg has been determined as orthorhombic Cmcm structure with lattice parameters a S = 0.400 nm, b S = 0.923 nm, c S = 0.714 nm by Perlitz and Westgren [9] (PW) on the basis of X-ray diffraction (XRD) work.…”

Section: Introductionmentioning

confidence: 99%

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Two types of S phase precipitates in Al–Cu–Mg alloys

2007

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Transmission electron microscopy (TEM) and differential scanning calorimetry (DSC) have been used to study S phase precipitation in an Al-4.2Cu-1.5Mg-0.6Mn-0.5Si (AA2024) and an Al-4.2Cu-1.5Mg-0.6Mn-0.08Si (AA2324) (wt.%) alloy. In DSC experiments on as solution treated samples two distinct exothermic peaks are observed in the range 250-350°C, whereas only one peak is observed in solution treated and subsequently stretched or cold worked samples. Samples heated to 270°C and 400°C at a rate of 10°C/min in the DSC have been studied by TEM. The selected area diffraction patterns show that S phase precipitates with the classic orientation relationship form during the lower temperature peak, and for the solution treated samples, the higher temperature peak is caused by the formation of a second type of S phase precipitates which have an orientation relationship that is rotated by ~4˚ to the classic one. The effects of Si and cold work on the formation of second type of S precipitates have been discussed.

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“…In many publications [1][2][3]8,10,21], S' and S in (SQ1) have been considered to have the same structure and the same orientation relationships with aluminium matrix (i.e. no rotation).…”

Section: Nomenclature For Type I and Type Ii S Phasementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Two types of S phase precipitates in Al–Cu–Mg alloys

2007

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“…The existence of a phase different from S or GPB (termed S" or GPB2) has been disputed [10], and various crystallographic structures have been reported [6,9,10,12,13]. Charai et al [12] and Kovarik et al [13] reported HREM work indicating the presence of an intermediate phase termed S" or GPB2.…”

Section: Ageing Sequencesmentioning

confidence: 99%

“…In the early work, the second stage of hardening was generally attributed to the formation of the S' or S phase [1]. In the 1980's, Cuisiat et al [6] suggested that a distinct precipitate termed S" was responsible for the peak hardness. In the 1990's, using atom-probe field ion microscopy, Ringer et al…”

Section: Introductionmentioning

confidence: 99%

Precipitation hardening in Al–Cu–Mg alloys revisited

2006

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Transmission electron microscopy, differential scanning calorimetry and hardness test have been used to study the precipitation sequence on artificial ageing of a stretched Al-Cu-Mg alloy.Two ageing temperatures at 190°C and 150°C for different times have been chosen. Some orthorhombic GPB2/S" is present in samples aged at 150°C for 48h, which is at the very start of the 2 nd stage of hardening. The combined experiments clearly show the second stage hardening is dominated by S phase, which forms a dense precipitation at the peak hardness stage, whilst no significant amounts of other phases or zones are detected.

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“…Orthorhombic [10,12], cubic [11], tetragonal [13,14] and monoclinic [15] structures have been proposed for the S"/GPB2 structure, but none of these has been independently confirmed. Indeed, other researchers (e.g., Wilson and Partridge [16] and…”

Section: Sssmentioning

confidence: 99%

VPPA welds of Al-2024 alloys: Analysis and modelling of local microstructure and strength

Wang

Lefebvre

Yan

et al. 2006

Materials Science and Engineering: A

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The microstructural features of variable polarity plasma arc welded Al-Cu-Mg 2024-T351 with 2319 filler have been studied by TEM, SEM and DSC. Fusion zone, partial melting zone, resolutionising zone, overageing (for S phase), peak ageing (for S phase) and under ageing zones (for S phase) have been identified. The Ω phase has been observed between re-solutionising zone and peak ageing zone. The hardness profile contains two peaks. The microstructure development, and resulting hardness and yield strength profiles are modelled using a model which combines primary precipitation, resolution, partial/full melting and resolidification (Scheil type) and reprecipitation, in a two precipitate -two mechanism approach. Hardness profiles and microstructures are accurately predicted. The hardness peak in the re-solutionising zone is due to re-solutionising and subsequent Cu-Mg co-cluster formation; and the second hardness peak is caused by S phase strengthening.

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Etude des premiers stades de decomposition d'un alliage AlCuMg

Cited by 60 publications

References 3 publications

Two types of S phase precipitates in Al–Cu–Mg alloys

Two types of S phase precipitates in Al–Cu–Mg alloys

Precipitation hardening in Al–Cu–Mg alloys revisited

VPPA welds of Al-2024 alloys: Analysis and modelling of local microstructure and strength

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