Constellation, le dépôt institutionnel de l'Université du Québec à Chicoutimi

Enhanced thermal stability of precipitates and elevated-temperature properties via microalloying with transition metals (Zr, V and Sc) in Al–Cu 224 cast alloys

Li Dong, Liu Kun, Rakhmonov Jovid et Chen X-Grant. (2021). Enhanced thermal stability of precipitates and elevated-temperature properties via microalloying with transition metals (Zr, V and Sc) in Al–Cu 224 cast alloys. Materials Science and Engineering: A, 827, e142090.

[img] PDF - Version acceptée
Administrateurs seulement jusqu´à 19 Octobre 2023.

3MB

URL officielle: http://dx.doi.org/doi:10.1016/j.msea.2021.142090

Résumé

The evolution of precipitates and the elevated-temperature mechanical and creep properties of Al–Cu 224 cast alloys with the microalloyed transition metals (TMs) of Zr, V, and Sc were investigated. The results showed that the addition of TMs can generally delay the transformation from θ″ to θ′ during T7 aging and can effectively increase the coarsening resistance of θ′ during prolonged thermal exposure (T7A), especially in the alloys with combined TM additions. Meanwhile, thermally stable L12-Al3M dispersoids were observed in alloys with Zr and Sc + Zr additions. With the increased thermal stability of the predominant strengthener θ′, both the yield strength and creep resistance at 300 °C were remarkably improved. Under the T7A condition, the alloy with the combined Zr + V addition achieved the highest yield strength at 300 °C with an increase of 37% relative to the base alloy. The alloy microalloyed with Sc + Zr exhibited the best creep resistance with a minimum creep rate of 5.5 × 10−9 s−1 compared with 2.0 × 10−7 s−1 for the base alloy, owing to the co-existence of thermally stable θ′ and Al3(Sc, Zr). The relationship between the evolution of the microstructure and the mechanical properties under the T7A condition was rationalized using the proposed strengthening mechanisms.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:827
Pages:e142090
Version évaluée par les pairs:Oui
Date:19 Octobre 2021
Sujets:Sciences naturelles et génie > Génie
Sciences naturelles et génie > Génie > Génie des matériaux et génie métallurgique
Sciences naturelles et génie > Sciences appliquées
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Module d'ingénierie
Mots-clés:Al–Cu cast Alloys, transition metals, precipitates, high-temperature strength, creep resistance, alliages moulés Al–Cu, métaux de transition, précipités, résistance à haute température, résistance au fluage
Déposé le:15 mars 2022 21:42
Dernière modification:15 mars 2022 21:42
Afficher les statistiques de telechargements

Éditer le document (administrateurs uniquement)

Creative Commons LicenseSauf indication contraire, les documents archivés dans Constellation sont rendus disponibles selon les termes de la licence Creative Commons "Paternité, pas d'utilisation commerciale, pas de modification" 2.5 Canada.

Bibliothèque Paul-Émile-Boulet, UQAC
555, boulevard de l'Université
Chicoutimi (Québec)  CANADA G7H 2B1
418 545-5011, poste 5630