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Evolution of discontinuous/continuous Al3(Sc,Zr) precipitation in Al-Mg-Mn 5083 alloy during thermomechanical process and its impact on tensile properties

Algendy Ahmed Y., Liu Kun, Rometsch Paul, Parson Nick et Chen X-Grant. (2022). Evolution of discontinuous/continuous Al3(Sc,Zr) precipitation in Al-Mg-Mn 5083 alloy during thermomechanical process and its impact on tensile properties. Materials Characterization, 192, e112241.

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URL officielle: https://doi.org/10.1016/j.matchar.2022.112241

Résumé

The evolution of discontinuous and continuous Al3(Sc,Zr) precipitation in an Al-Mg-Mn AA5083 alloy during heat treatment and hot rolling was investigated. The results showed that, at a high Sc content (0.43 wt%), a large number of line/fan-shaped structures were formed as discontinuous Al3(Sc,Zr) precipitation during solidification, while no such discontinuous precipitation was observed when the amount of Sc added was low (0.15 wt%). During the three-step heat treatment (275 °C /12 h + 375 °C/48 h + 425 °C/12 h), two types of precipitates — Mn-bearing dispersoids and spherical Al3(Sc,Zr) precipitates — were formed as the main strengthening phases. In the high-Sc alloy, the discontinuous Al3(Sc,Zr) precipitates dissolved partially. However, the quantity of the spherical Al3(Sc,Zr) precipitates in the high-Sc alloy was much lower than that in the low-Sc alloy, which degraded its aging hardening response. During hot rolling, although the discontinuous precipitates were completely dissolved, the number density of the spherical Al3(Sc,Zr) precipitates in the high-Sc alloy was still lower than that in the low-Sc alloy. The tensile properties of the Sc-containing alloys improved significantly compared with those of the base alloy. However, the yield and ultimate tensile strengths of the high-Sc alloy were lower than those of the low-Sc alloy. This indicates that the discontinuous precipitation had a deleterious effect on the mechanical properties of the alloy.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:10445803
Volume:192
Pages:e112241
Version évaluée par les pairs:Oui
Date:2022
Identifiant unique:10.1016/j.matchar.2022.112241
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 5083 alloy, discontinuous Al3(Sc,Zr) precipitation, Sc and Zr addition, microstructure, mechanical properties, alliage Al-Mg-Mn 5083, précipitation discontinue Al3(Sc,Zr), addition Sc et Zr, propriétés mécaniques
Déposé le:30 sept. 2022 18:00
Dernière modification:30 sept. 2022 18:00
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