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Improvement of elevated-temperature strength and recrystallization resistance via Mn-containing dispersoid strengthening in Al-Mg-Si 6082 alloys

Li Chen, Liu Kun et Chen X-Grant. (2020). Improvement of elevated-temperature strength and recrystallization resistance via Mn-containing dispersoid strengthening in Al-Mg-Si 6082 alloys. Journal of Materials Science & Technology, 39, p. 135-143.

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URL officielle: http://dx.doi.org/doi:10.1016/j.jmst.2019.08.027

Résumé

The precipitation behavior of Mn-containing dispersoids in Al-Mg-Si 6082 alloys with different Mn contents (0, 0.5 and 1.0 wt%) during various heat treatments (300–500 ℃) was investigated. The effects of dispersoids on elevated-temperature strength and recrystallization resistance during hot-rolling and post-rolling annealing were evaluated. The results showed that the dispersoids in the Mn-containing alloys (0.5 and 1.0%) began to precipitate at 350 ℃ and reached the optimum conditions after 2–4 h at 400 ℃. However, the dispersoids coarsened with increasing holding time at temperatures above 450 ℃. After the peak precipitation treatment at 400 ℃ for 2 h, the yield strength at 300 ℃ increased from 28 MPa (base alloy free of Mn) to 55 MPa (alloy with 0.5% Mn) and 70 MPa (alloy with 1% Mn), respectively, demonstrating a significant dispersoid strengthening effect at elevated temperature. In addition, the dispersoids were thermally stable at 300 ℃ for up to 1000 h holding owing to its relative high precipitation temperature (350–400 ℃), leading to the superior constant mechanical performance at elevated temperature during the long service life. During hot rolling and post-rolling annealing, the presence of a large amount of dispersoids results in the higher Zener drag PZ compared with base alloy and then significantly improved the recrystallization resistance. The alloy containing 0.5% Mn exhibited the highest recrystallization resistance among three experimental alloys studied during the post-rolling process, likely resulted from the lower coarsening rate of dispersoids and the lower dispersoids free zone.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:39
Pages:p. 135-143
Version évaluée par les pairs:Oui
Date:15 Février 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-Mg-Si 6082 alloy, Mn addition, dispersoid precipitation, elevated-temperature strength, recrystallization resistance, alliage Al-Mg-Si 6082, ajout de Mn, précipitation dispersoïde, résistance aux températures élevées, résistance à la recristallisation
Déposé le:16 janv. 2020 23:17
Dernière modification:16 janv. 2020 23:17
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