Precipitation of Al&lt;SUB&gt;3&lt;/SUB&gt;Sc in Al-0.23 mass%Sc Alloy

Nakayama, Masaru; Furuta, Akira; Miura, Yoshio

doi:10.2320/matertrans1989.38.852

Cited by 22 publications

(13 citation statements)

References 12 publications

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“…By formulating the Gibbs-Thomson equation for the ternary system, they found that the temporal power laws of the average particle radius, far-field-matrix supersaturation and particle number density were identical to those of the LSW theory but the amplitudes of these power laws were different from the LSW theory. The theories of LSW, LSW modified by Ardell, and KV have already been employed to study the Ostwald ripening processes of spherical second-phase precipitates in actual alloys [5][6][7][8][9]. However, the actual shapes of second-phase particles are usually non-spherical.…”

Section: Introductionmentioning

confidence: 99%

Determination of the interface energies of spherical, cuboidal and octahedral face-centered cubic precipitates in Cu–Co, Cu–Co–Fe and Cu–Fe alloys

Watanabe¹,

Watanabe²,

Monzen³

2009

Acta Materialia

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Section: Introductionmentioning

confidence: 99%

Determination of the interface energies of spherical, cuboidal and octahedral face-centered cubic precipitates in Cu–Co, Cu–Co–Fe and Cu–Fe alloys

Watanabe¹,

Watanabe²,

Monzen³

2009

Acta Materialia

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“…Indeed, Nakayama et al [7] studied an alloy containing 0.138 at.% Sc aged at 250, 300 and 350 • C. But they normalized their measurements and did not specify the measuring temperature nor the corresponding pure Al resistivity, thus forbidding any use of their data. Drits et al [5] studied an alloy the Sc composition of which is larger than the Sc solubility limit and even the eutectic composition.…”

Section: Discussionmentioning

confidence: 99%

“…In Al-Sc alloys, such an increase of the resistivity in the beginning of the precipitation kinetics has never been observed experimentally [5][6][7][8][9][10]. Actually, it does not seem to exist in alloys where the solute is a transition element and the solvent a free electron like metal [20].…”

Section: Cluster Contribution To Electrical Resistivitymentioning

confidence: 99%

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Using cluster dynamics to model electrical resistivity measurements in precipitating AlSc alloys

Clouet

Barbu

2007

Acta Materialia

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Electrical resistivity evolution during precipitation in Al-Sc alloys is modeled using cluster dynamics. This mesoscopic modeling has already been shown to correctly predict the time evolution of the precipitate size distribution. In this work, we show that it leads too to resistivity predictions in quantitative agreement with experimental data. We only assume that all clusters contribute to the resistivity and that each cluster contribution is proportional to its area. One interesting result is that the resistivity excess observed during coarsening mainly arises from large clusters and not really from the solid solution. As a consequence, one cannot assume that resistivity asymptotic behavior obeys a simple power law as predicted by LSW theory for the solid solution supersaturation. This forbids any derivation of the precipitate interface free energy or of the solute diffusion coefficient from resistivity experimental data in a phase-separating system like Al-Sc supersaturated alloys.

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“…It exhibits a relative small but clear exothermic peak with a start temperature of 367 C and a precipitation enthalpy of 1.1 J/g. This peak can be correlated with secondary Al 3 Sc precipitation which typically occurs at temperatures between 300 C and 400 C [14,15,16]. The presence of this DSCpeak proves the supersaturated solid solution of scandium in the spray formed flat deposit #2.…”

Section: Aging Behaviourmentioning

confidence: 99%

Spray formed and rolled aluminium‐magnesium‐scandium alloys with high scandium content

Herding

Keßler²,

Zoch

2007

Materialwissenschaft Werkst

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Aluminium-magnesium-scandium alloys offer good weldability, high corrosion resistance, high thermal stability and the potential for high strength by precipitation hardening. A problem of aluminium-scandium alloys is the low solubility of about 0.3 mass-% scandium when using conventional casting methods. The solution of scandium can be raised by higher cooling rates during solidification. This was realised by spray forming of Al-4.5Mg-0.7Sc alloys as flat deposits. Further cooling rates after solidification should also be high to prevent coarse precipitation of secondary Al 3 Sc. Therefore a cooling device was designed for the spray formed flat deposits. The flat deposits were rolled at elevated temperatures to close the porosity from spray forming. Microstructures, aging behaviour and tensile properties of the rolled sheets were investigated. Strength enhancements of about 100 MPa compared to conventional Al-Mg-Sc alloys were achieved.Keywords: Al-Mg-Sc alloys, spray forming, rolling, microstructure, tensile properties Aluminium-Magnesium-Scandium-Legierungen zeichnen sich durch gute Schweißeignung, hohe Korrosionsbeständigkeit, hohe thermische Stabilität und ein hohes Potenzial zur Ausscheidungshärtung aus. Problematisch ist die relativ geringe Löslichkeit von 0,3 Masse-% Scandium in Aluminium bei konventionellen Gieß-verfahren. Die Löslichkeit von Scandium kann durch höhere Abkühlgeschwindigkeiten bei der Erstarrung gesteigert werden. Dies wurde mittels Sprühkompaktieren einer AlMg4,5Sc0,7-Legierung zu Flachprodukten realisiert. Auch nach der Erstarrung muss die Abkühlgeschwindigkeit ausreichend hoch sein, um grobe sekundäre Al 3 Sc-Ausscheidungen zu unterdrücken. Dies wurde mittels einer Kühlvorrichtung für die sprühkompaktierten Flachprodukte realisiert. Anschließend wurden die Flachprodukte warmgewalzt, um die Porosität zu schließen. Gefüge, Auslagerungsverhalten und Kenngrößen des Zugversuchs der gewalzten Bleche wurden untersucht. Die Festigkeit konnte um ca. 100 MPa gegenüber konventionellen Al-Mg-Sc-Legierungen gesteigert werden.

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Precipitation of Al<SUB>3</SUB>Sc in Al-0.23 mass%Sc Alloy

Cited by 22 publications

References 12 publications

Determination of the interface energies of spherical, cuboidal and octahedral face-centered cubic precipitates in Cu–Co, Cu–Co–Fe and Cu–Fe alloys

Determination of the interface energies of spherical, cuboidal and octahedral face-centered cubic precipitates in Cu–Co, Cu–Co–Fe and Cu–Fe alloys

Using cluster dynamics to model electrical resistivity measurements in precipitating AlSc alloys

Spray formed and rolled aluminium‐magnesium‐scandium alloys with high scandium content

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