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Improving the mechanical response of Al–Mg–Si 6082 structural alloys during high-temperature exposure through dispersoid strengthening

Rakhmonov Jovid, Liu Kun, Rometsch Paul, Parson Nick et Chen X-Grant. (2020). Improving the mechanical response of Al–Mg–Si 6082 structural alloys during high-temperature exposure through dispersoid strengthening. Materials, 13, (22), p. 5295.

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URL officielle: http://dx.doi.org/doi:10.3390/ma13225295

Résumé

The feasibility and efficacy of improving the mechanical response of Al–Mg–Si 6082 structural alloys during high temperature exposure through the incorporation of a high number of α-dispersoids in the aluminum matrix were investigated. The mechanical response of the alloys was characterized based on the instantaneous high-temperature and residual room-temperature strengths during and after isothermal exposure at various temperatures and durations. When exposed to 200 °C, the yield strength (YS) of the alloys was largely governed by β” precipitates. At 300 °C, β” transformed into coarse β’, thereby leading to the degradation of the instantaneous and residual YSs of the alloys. The strength improvement by the fine and dense dispersoids became evident owing to their complementary strengthening effect. At higher exposure temperatures (350–450 °C), the further improvement of the mechanical response became much more pronounced for the alloy containing fine and dense dispersoids. Its instantaneous YS was improved by 150–180% relative to the base alloy free of dispersoids, and the residual YS was raised by 140% after being exposed to 400–450 °C for 2 h. The results demonstrate that introducing thermally stable dispersoids is a cost-effective and promising approach for improving the mechanical response of aluminum structures during high temperature exposure.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:13
Numéro:22
Pages:p. 5295
Version évaluée par les pairs:Oui
Date:23 Novembre 2020
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–Mg–Si 6082 alloys, microstructure, high-temperature mechanical properties, residual mechanical behavior, α-Al(MnFe)Si dispersoids, Alliages Al – Mg – Si 6082, microstructure, propriétés mécaniques à haute température, comportement mécanique résiduel, dispersoïde α-Al (MnFe) Si
Déposé le:18 févr. 2021 16:53
Dernière modification:18 févr. 2021 16:53
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