Structural State and Decomposition Kinetics in Rapidly Quenched Al - Sc, Al-Mg-Sc Alloys

Berezina, A.L.; Schmidt, U.; Monastyrskaya, Tatjana; Chuistov, K. V.; Kоtkо, А. V.; Kolobnev, N. I.

doi:10.4028/www.scientific.net/msf.396-402.763

Cited by 9 publications

(4 citation statements)

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“…It was made observations about the existence of the temperature-concentration region of the cluster melt. Our study of structural states of Al-Sc alloys shown that the «fan» structure containing the Al 3 Sc-phase is formed by the rapid quenching from 1000 o C (the region of the cluster melt) while it is absent and the anomalous supersaturation of the solid solution has a place by the rapid quenching from 1400 o C (the region of the "homogeneous" melt) [1,2,5,6]. The purpose of the presented study was to determine features of structures in dependence on the nature of alloying elements, the quenching temperature and the cooling rate from the melt; to study the thermal stability of structures.…”

Section: Introductionmentioning

confidence: 86%

The Effect of Aging Processes on the Structure and Properties of Rapidly Solidified Al-Sc, Al-Zr and Al-Hf Alloys

Berezina¹,

Segida²,

Носенко³

et al. 2006

MSF

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Structural states of Al-Sc, Al-Hf and Al-Zr alloys rapidly quenched from the liquid state have been studied. Features of structures in dependence on the nature of alloying elements, on the quenching temperature and the cooling rate by the crystallization of ribbons have been investigated. Fractal structures are formed by the quenching from the certain temperature-concentration region. The change of the morphology of structures has been researched during the aging process.

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Section: Introductionmentioning

confidence: 86%

The Effect of Aging Processes on the Structure and Properties of Rapidly Solidified Al-Sc, Al-Zr and Al-Hf Alloys

Berezina¹,

Segida²,

Носенко³

et al. 2006

MSF

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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: 92%

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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“…Even a small percentage of Sc results in high strength, good corrosion resistance, weldability, fatigue resistance, etc. [4][5][6] for the Al-Mg alloys.…”

Section: Introductionmentioning

confidence: 99%

Influence of Carbon and Scandium on Structure of Metastable Al$_3$Mg Phase and Properties of SPS-Composites

Rud¹,

Lakhnik²,

Kirian³

et al. 2021

Metallofiz. Noveishie Tekhnol.

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The solid dispersant (graphite) and additional alloying by scandium effects on the intermetallic compound formation in the Al-Mg system under mechanical alloying are studied. As found, the scandium additive significantly accelerates the metastable intermetallic Al 3 Mg phase formation in (75% at. (Al + 2% wt. Sc)-25% at. Mg)/5% wt. C powder mixture compared to the (75% at. Al-25% at. Mg )/5% wt. C one. The synthesized powder composite, containing metastable Al 3 Mg phase and solid solution based on aluminium, is consolidated by the spark plasma sintering (SPS) method. The phase composition, structure, and hardness of the SPS sintered samples are determined by X-ray diffraction, scanning electron microscopy, and indentation by the Vickers indenter. The hardness of samples formed after spark plasma sintering is in the range of 175-212 HV and significantly exceeds the hardness of duralumin (124 HV).

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Structural State and Decomposition Kinetics in Rapidly Quenched Al - Sc, Al-Mg-Sc Alloys

Cited by 9 publications

References 0 publications

The Effect of Aging Processes on the Structure and Properties of Rapidly Solidified Al-Sc, Al-Zr and Al-Hf Alloys

The Effect of Aging Processes on the Structure and Properties of Rapidly Solidified Al-Sc, Al-Zr and Al-Hf Alloys

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

Influence of Carbon and Scandium on Structure of Metastable Al$_3$Mg Phase and Properties of SPS-Composites

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