LiveZilla Live Chat Software

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

Evolution of dispersoids and their effects on elevated-temperature strength and creep resistance in Al-Si-Cu 319 cast alloys with Mn and Mo additions

Jin Lanfeng, Liu Kun et Chen X-Grant. (2020). Evolution of dispersoids and their effects on elevated-temperature strength and creep resistance in Al-Si-Cu 319 cast alloys with Mn and Mo additions. Materials Science and Engineering: A, 770, p. 138554.

[img] PDF - Version acceptée
Administrateurs seulement jusqu´à 7 Janvier 2022.

2MB

URL officielle: https://doi.org/10.1016/j.msea.2019.138554

Résumé

The present work investigated the evolution of dispersoids during various heat treatments via Mn and Mo additions and studied their effects on the yield strength (YS) and creep resistance at elevated temperature in Al-Si-Cu 319 cast alloys. The results showed that the individual addition of Mn or Mo promoted the precipitation of α-dispersoids; however, the best effect was achieved by their combined addition. The optimum heat treatment condition was at 500 °C for 8 h; under this condition, the largest quantity of and the finest α-dispersoids were obtained, resulting in remarkable improvements in YS at both room and elevated temperatures. The creep resistance at 300 °C was enhanced owing to the additions of Mn and Mo. Compared with the properties of the base alloy, a 19% improvement in YS at 300 °C, doubling of threshold stress and a 50-fold reduction in the minimum creep rate on the creep property at 300 °C were achieved by the combined addition of Mn and Mo. The alloy with both Mn and Mo exhibited the lowest YS decline rate and no change in the minimum creep rate during prolonged thermal exposure at 300 °C for up to 1000 h, demonstrating the superior thermal stability achieved by the 319 alloys with the introduction of a sufficient number of dispersoids from Mn and Mo additions.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:770
Pages:p. 138554
Version évaluée par les pairs:Oui
Date:7 Janvier 2020
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:Al-Si-Cu 319 alloy, elevated-temperature strength, creep resistance, thermal stability, alliage Al-Si-Cu 319, résistance à la température élevée, résistance au fluage, stabilité thermique
Déposé le:12 nov. 2019 22:39
Dernière modification:12 nov. 2019 22:39
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