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Effect of quenching rate on precipitation kinetics in AA2219 DC cast alloy

Elgallad Emad Eldin, Zhang Zhan et Chen X-Grant. (2017). Effect of quenching rate on precipitation kinetics in AA2219 DC cast alloy. Physica B: Condensed Matter, 514, p. 70-77.

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URL officielle: https://doi.org/10.1016/j.physb.2017.03.039

Résumé

Slow quenching of direct chill (DC) cast aluminum ingot plates used in large mold applications is often used to decrease quench-induced residual stresses, which can deteriorate the machining performance of these plates. Slow quenching may negatively affect the mechanical properties of the cast plates when using highly quench-sensitive aluminum alloys because of its negative effect on the precipitation hardening behavior of such alloys. The effect of the quenching rate on precipitation kinetics in AA2219 DC cast alloy was systematically studied under water and air quenching conditions using differential scanning calorimetry (DSC) technique. Transmission electron microscopy (TEM) was also used to characterize the precipitate microstructure. The results showed that the precipitation kinetics of the θ′ phase in the air-quenched condition was mostly slower than that in the water-quenched one. Air quenching continuously increased the precipitation kinetics of the θ phase compared to water quenching. These results revealed the contributions of the inadequate precipitation of the strengthening θ′ phase and the increased precipitation of the equilibrium θ phase to the deterioration of the mechanical properties of air-quenched AA2219 DC cast plates. The preexisting GP zones and quenched-in dislocations affected the kinetics of the θ′ phase, whereas the preceding precipitation of the θ′ phase affected the kinetics of the θ phase by controlling its precipitation mechanism.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:514
Pages:p. 70-77
Version évaluée par les pairs:Oui
Date:1 Juin 2017
Sujets:Sciences naturelles et génie > Génie > Génie des matériaux et génie métallurgique
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Module d'ingénierie
Mots-clés:AA2219 alloy, Quenching rate, Precipitation kinetics, DSC analysis, Alliage AA2219, taux de trempage, cinétique des précipitations, analyse DSC
Déposé le:06 juin 2017 14:47
Dernière modification:06 juin 2017 14:47
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