Precipitation Processes in Al-4Cu-(Mg, Cd) (wt. %) Alloys

Sofyan, Bondan Tiara; Polmear, I. J.; Ringer, Simon P.

doi:10.4028/www.scientific.net/msf.396-402.613

Cited by 8 publications

(8 citation statements)

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“…[5,[11][12][13][14][15][16][17] For each of these studies, V precipitation was only present as a minor phase when artificially aged at moderate temperatures, with the matrix precipitation dominated by u# and S. Still, the role of magnesium in the microstructural evolution of V is not well understood; however, it is believed to be a critical component for V nucleation, because this phase has not been observed in Al-Cu-Ag ternary alloys. [18] The quantitative study by Unlu et al [15,16] reported that the nucleation density of V is an order of magnitude less than that typically observed in similar alloys with silver additions, despite the enhanced matrix nucleation resulting from the introduction of a preage mechanical stretch when artificially aged at 200°C and 250°C.…”

Section: Microstructural Evolution Of Al-cu-mg Ternary Alloysmentioning

confidence: 99%

“…Although silver was first thought to be the origin of this novel phase, [21] the studies of Garg et al [11] and other research groups [5,[12][13][14][15][16] on V precipitation in Al-Cu-Mg non-silver-containing alloys have illustrated that silver is merely a catalyst for V precipitation. The absence of V plate formation in AlCu-Ag ternary alloys is evidence that magnesium does play a critical role for nucleation.…”

Section: Alloy Composition: Effect Of Magnesium and Silvermentioning

confidence: 99%

“…Other researchers have reported enhanced V precipitation in Al-Cu-Mg ternary alloys through high-temperature aging, trace additions of cadmium, and substantial natural aging before artificial aging. [5,12,14] 2. Microstructural evolution of Al-Cu-Mg-Ag quaternary alloys…”

Section: Microstructural Evolution Of Al-cu-mg Ternary Alloysmentioning

confidence: 99%

“…[18,[24][25][26][27][28][29] Several researchers have observed plate-like precipitation along {111} a in age-hardenable Al-Cu binary [30] and Al-Cu-Mg ternary alloys [5,[11][12][13][14][15][16][17] with compositions in the (a 1 u) and (a 1 u 1 S) phase fields, respectively. Because of these findings, V is treated as a metastable {111} a variant of equilibrium u when considering the aluminum-rich corner of the Al-Cu-Mg-(Ag) phase diagram.…”

Section: Microstructural Evolution Of Al-cu-mg Ternary Alloysmentioning

confidence: 99%

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Alloy development for the enhanced stability of Ω precipitates in Al-Cu-Mg-Ag alloys

Gable

Shiflet

Starke

2006

Metall Mater Trans A

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The coarsening resistance and thermal stability of several V plate-dominated microstructures were controlled through altering the chemistry and thermomechanical processing of various Al-Cu-Mg-Ag alloys. Quantitative comparisons of V nucleation density, particle size, and thermal stability were used to illustrate the effects of alloy composition and processing conditions. The long-term stability of V plates was found to coincide with relatively high levels of silver and moderate magnesium additions, with the latter limiting the competition for solute with S-phase precipitation. This analysis revealed that certain microstructures initially dominated by V precipitation were found to remain stable through long-term isothermal and double-aging heat treatments, which represents significant improvement over the previous generation of Al-Cu-Mg-Ag alloys, in which V plates dissolved sacrificially after long aging times. The quantitative precipitate data, in conjunction with a thermodynamic database for the aluminum-rich corner of the Al-Cu-Mg-Ag quaternary system, were used to estimate the chemistry of the a/V-interphase boundary. These calculations suggest that silver is the limiting species at the a/V interfacial layer and that V plates form with varying interfacial chemistries during the early stages of artificial aging, which is directly related to the overall stability of certain plates.

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Section: Microstructural Evolution Of Al-cu-mg Ternary Alloysmentioning

confidence: 99%

Section: Alloy Composition: Effect Of Magnesium and Silvermentioning

confidence: 99%

Section: Microstructural Evolution Of Al-cu-mg Ternary Alloysmentioning

confidence: 99%

Section: Microstructural Evolution Of Al-cu-mg Ternary Alloysmentioning

confidence: 99%

See 2 more Smart Citations

Alloy development for the enhanced stability of Ω precipitates in Al-Cu-Mg-Ag alloys

Gable

Shiflet

Starke

2006

Metall Mater Trans A

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“…The presence of Mg in Al-Li-Cu-X alloys also enhances the {111} ␣ Al 2 CuLi (T 1 ) equilibrium phase matrix precipitation. [8,[24][25][26][27] They reported enhanced ⍀ precipitation through the introduction of Cd, dislocations from cold working, and substantial natural aging prior to artificial aging. To better understand the role of Ag on the nucleation and growth kinetics of the ⍀ phase, a comparative aging study by Garg et al was conducted on Al-4.0Cu-0.5Mg (wt pct) and Al-4.0Cu-0.5Mg-0.5Ag (wt pct) alloys.…”

Section: A ⍀ Precipitationmentioning

confidence: 99%

The effect of cold work on the precipitation of Ω and θ′ in a ternary Al-Cu-Mg alloy

Ünlü

Gable

Shiflet

et al. 2003

Metall Mater Trans A

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The effect of plastic deformation on the microstructural evolution of an Al-5.0Cu-0.5Mg (wt pct) ternary alloy was investigated. Hardness measurements and quantitative precipitate analysis were performed on specimens that were water quenched from a solution heat treatment, stretched either 0 or 6 pct and immediately aged at ambient temperature or artificially aged at 200°C or 250°C for times up to 3000 hours. Quantitative transmission electron microscopy (TEM) was used to characterize ⍀ and Ј number density, diameter, and thickness as a function of preage mechanical stretch and artificial aging condition. Age hardening curves for naturally and artificially aged specimens revealed an increase in hardness corresponding with a preage stretch. Quantitative TEM verified an increase in the number density and a refinement of precipitates for both ⍀ and Ј between the 0 and 6 pct stretch condition for those samples artificially aged. When aged at 200°C, Ј exhibited superior coarsening resistance relative to the ⍀ phase. The quantified ⍀ coarsening kinetics were greater than similar Ag-containing alloys. To investigate the effects of trace Si additions on subsequent microstructural evolution, a series of Al-Cu-Mg-Si quaternary alloys were produced. The addition of 0.1Si (wt pct) was found to suppress ⍀ precipitation in most Al-4.0Cu-xMg alloys investigated. These initial results indicate that ⍀ precipitation may be related to the Mg/Si ratio.

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Effects of Microalloying with Sn on the Precipitation Process of Al‐3.5Cu‐0.4Mg(wt%) Alloy

Shu¹,

Chen²,

Zhang³

2012

ICAA13: 13th International Conference on Aluminum Alloys

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Precipitation Processes in Al-4Cu-(Mg, Cd) (wt. %) Alloys

Cited by 8 publications

References 0 publications

Alloy development for the enhanced stability of Ω precipitates in Al-Cu-Mg-Ag alloys

Alloy development for the enhanced stability of Ω precipitates in Al-Cu-Mg-Ag alloys

The effect of cold work on the precipitation of Ω and θ′ in a ternary Al-Cu-Mg alloy

Effects of Microalloying with Sn on the Precipitation Process of Al‐3.5Cu‐0.4Mg(wt%) Alloy

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