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Effects of Mn addition and related Mn-containing dispersoids on the hot deformation behavior of 6082 aluminum alloys

Qian Xiaoming, Parson Nick et Chen X-Grant. (2019). Effects of Mn addition and related Mn-containing dispersoids on the hot deformation behavior of 6082 aluminum alloys. Materials Science and Engineering: A, 764, p. 138253.

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URL officielle: https://doi.org/10.1016/j.msea.2019.138253

Résumé

The hot deformation behaviors of 6082 aluminum alloys containing different Mn contents (0.05–1.0 wt%) were systematically investigated by uniaxial compression tests in a temperature range of 400–550 °C and strain rate range of 0.001–1 s-1. Prior to the hot deformation, a low-temperature homogenization (450 °C for 6 h) was carried out on direct-chill cast billets to promote the precipitation of Mn-containing dispersoids. The large numbers of dispersoids in the Mn-containing alloys yielded significantly increased high-temperature flow stresses, compared to that of the base alloy without dispersoids. The material constants and activation energies for hot deformation were determined using the hyperbolic-sine constitutive equation and experimental peak flow stress data. The activation energy increased from 191 kJ/mol for the base alloy to 286 kJ/mol for the alloy with 0.5% of Mn. With further increase in Mn content, the activation energy increased only moderately to 315 kJ/mol for the alloy with 1.0% of Mn. The influences of the Mn content and deformation conditions on the dynamic recovery and recrystallization were quantitatively analyzed. The precipitation of dispersoids in the Mn-containing alloys promoted the retardation of the dynamic recovery and inhibition of the recrystallization owing to their strong pinning effect on the dislocation movement and subgrain migration.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:764
Pages:p. 138253
Version évaluée par les pairs:Oui
Date:9 Septembre 2019
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:6082 aluminum alloy, Mn addition, dispersoids, hot deformation, activation energy, dynamic recovery and recrystallization, alliage d'aluminium 6082, addition de Mn, dispersoïdes, déformation à chaud, énergie d'activation, récupération dynamique et recristallisation
Déposé le:12 nov. 2019 22:30
Dernière modification:12 nov. 2019 22:30
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