The precipitate Ω phase in Al-Cu-Mg-Ag alloys

Muddle, Barrington Charles; Polmear, I. J.

doi:10.1016/0001-6160(89)90005-9

Cited by 270 publications

(104 citation statements)

References 10 publications

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“…Plates of Ω and ηp (identified by lattice imaging) are viewed edge-on, with two other rounded plates on either {100}Al or {111}Al planes connecting to the middle part. With Ω and θ' typically having welldefined faceted edges [46,47], the plates are most likely to be an η-type phase. Only the first of the phases presented in Fig.…”

Section: Nucleationmentioning

confidence: 99%

A hybrid aluminium alloy and its zoo of interacting nano-precipitates

Wenner

Marioara

Andersen

et al. 2015

Materials Characterization

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An alloy with aluminium as its base element is heat treated to form a multitude of precipitate phases known from different classes of industrial alloys: Al-Cu(-Mg), Al-Mg-Si-Cu, and Al-Zn-Mg. Nanometer-sized needle-shaped particles define the starting point of the phase nucleation, after which there is a split in the precipitation sequence into six phases of highly diverse compositions and morphologies. There are several unique effects of phases from different alloy systems being present in the same host lattice, of which we concentrate on two: the replacement of Ag by Zn on the Ω interface and the formation of combined plates of the θ' and C phases. Using atomically resolved scanning transmission electron microscopy and energy-dispersive X-ray spectroscopy, we investigate the formation mechanisms, crystal structures and compositions of the precipitates.

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Section: Nucleationmentioning

confidence: 99%

A hybrid aluminium alloy and its zoo of interacting nano-precipitates

Wenner

Marioara

Andersen

et al. 2015

Materials Characterization

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“…The effects of such trace elemental additions on precipitation have been demonstrated previously (11,12)in other aluminum alloys.…”

Section: Resultsmentioning

confidence: 64%

Effect of a prior stretch on the aging response of an Al-Cu-Li-Ag-Mg-Zr alloy

Kumar¹,

Brown²,

Pickens³

1990

Scripta Metallurgica et Materialia

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“…Additional trace elements of Mg and Ag have been found to induce the finely dispersed precipitate on f111g Al planes, replacing the conventional GP zones and 0 plates on f001g Al planes. 1) This trace element effect on the precipitation of has been shown by atom probe field ion microscopy (APFIM) study 2) as MgAg clusters formed at the beginning of ageing, then Cu atoms aggregated into the clusters to form nuclei on {111} planes. Considering strain energy, Suh et al have pointed out that the incorporation of Mg and Ag decreases the strain energy for the nucleation of on {111} plane.…”

Section: Introductionmentioning

confidence: 91%

“…It should be mentioned that plate is hardly observed in comparison to GP zones. From literature, 1) phase has an orthorhombic structure with the c axis corresponding to the four {111} Al planes. The observed in Fig.…”

Section: Hrem Observation Of the Early Stage Of Platesmentioning

confidence: 99%

Competitive Nucleation and Growth of {111} Ω with {001} GP Zones and θ′ in a Stress-Aged Al-Cu-Mg-Ag Alloy

2004

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The stress aging method was conducted for an Al-Cu-Mg-Ag polycrystalline alloy to study the competitive nucleation and growth behavior of GP zones, 0 and precipitates concurrently existing on different {001} and {111} habit planes. After initial stress aging for 1 h, the preferential nucleation of GP zones against occurred irrespective of the stress direction applied to the grains. With increasing aging time, the density of increased while the GP zones decreased in number to dissolve into the matrix, resulting from competitive nucleation due to the mutual constituent of Cu in GP zones and . With further stress aging, the growth of 0 plates was enhanced in comparison with the growth of plates. The relative number density change between {001} and {111} precipitates was emphasized especially in grains with the stress direction along [001], which indicated that nucleation and growth of GP zones and 0 plates were highly sensitive to external stress compared with that of . HREM observation found that low amounts of small plates were nucleated during the initial stress aging indicating retarded nucleation. Two-step aging (stress aging for 1 h followed by the stress-free aging) revealed that preferentially nucleated GP zone against during the initial stress aging determined the successive precipitation sequence of the precipitation of and 0 .

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The precipitate Ω phase in Al-Cu-Mg-Ag alloys

Cited by 270 publications

References 10 publications

A hybrid aluminium alloy and its zoo of interacting nano-precipitates

A hybrid aluminium alloy and its zoo of interacting nano-precipitates

Effect of a prior stretch on the aging response of an Al-Cu-Li-Ag-Mg-Zr alloy

Competitive Nucleation and Growth of {111} Ω with {001} GP Zones and θ′ in a Stress-Aged Al-Cu-Mg-Ag Alloy

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The precipitate Ω phase in Al-Cu-Mg-Ag alloys

Cited by 270 publications

References 10 publications

A hybrid aluminium alloy and its zoo of interacting nano-precipitates

A hybrid aluminium alloy and its zoo of interacting nano-precipitates

Effect of a prior stretch on the aging response of an Al-Cu-Li-Ag-Mg-Zr alloy

Competitive Nucleation and Growth of {111} &Omega; with {001} GP Zones and &theta;&prime; in a Stress-Aged Al-Cu-Mg-Ag Alloy

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Competitive Nucleation and Growth of {111} Ω with {001} GP Zones and θ′ in a Stress-Aged Al-Cu-Mg-Ag Alloy