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Evolution of dispersoids during multistep heat treatments and their effect on rolling performance in an Al-5% Mg-0.8% Mn alloy

Algendy Ahmed Y., Liu Kun et Chen X-Grant. (2021). Evolution of dispersoids during multistep heat treatments and their effect on rolling performance in an Al-5% Mg-0.8% Mn alloy. Materials Characterization, 181, e111487.

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URL officielle: http://dx.doi.org/doi:10.1016/j.matchar.2021.11148...

Résumé

The precipitation behavior of dispersoids in an Al-5% Mg-0.8% Mn alloy after various single-and multistep heat treatments and their effect on rolling performance were investigated. The results show a significant increase in the electrical conductivity and microhardness caused by the precipitation of submicron dispersoids after all heat treatments. In addition, the multistep heat treatments resulted in higher microhardness and a larger fraction of dispersoid zones than single-step treatments. Two types of Mn-bearing dispersoids with cube- and rod-like morphologies were identified. The low-temperature two-step heat treatment (275 °C/12 h + 375 °C /48 h) produced the highest number density of dispersoids with the finest size among all the studied heat treatments but severe defects were created during hot-rolling. The three-step heat treatment (275 °C/12 h + 375 °C/48 h + 500 °C/4 h) provided the best combination of dispersoid characteristics and rolling performance. The mechanical properties of rolled sheets subjected to the three-step heat treatment were improved compared to those treated using industrial homogenization treatment, owing to the higher number density and finer size of the dispersoids.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:10445803
Volume:181
Pages:e111487
Version évaluée par les pairs:Oui
Date:2021
Identifiant unique:10.1016/j.matchar.2021.111487
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-Mn alloy, dispersoids, multi-step heat treatment, microstructure, rolling performance, mechanical properties, alliage Al-Mg-Mn, dispersoïdes, traitement thermique en plusieurs étapes, performances de roulement, propriétés mécaniques
Déposé le:26 avr. 2022 21:17
Dernière modification:01 nov. 2023 04:00
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