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Microstructural evolution and dynamic softening mechanisms of Al-Zn-Mg-Cu alloy during hot compressive deformation

Shi Cangji, Lai Jing et Chen X-Grant. (2014). Microstructural evolution and dynamic softening mechanisms of Al-Zn-Mg-Cu alloy during hot compressive deformation. Materials, 7, (1), p. 244-264.

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URL officielle: http://dx.doi.org/doi:10.3390/ma7010244

Résumé

The hot deformation behavior and microstructural evolution of an Al-Zn-Mg-Cu (7150) alloy was studied during hot compression at various temperatures (300 to 450 °C) and strain rates (0.001 to 10 s−1). A decline ratio map of flow stresses was proposed and divided into five deformation domains, in which the flow stress behavior was correlated with different microstructures and dynamic softening mechanisms. The results reveal that the dynamic recovery is the sole softening mechanism at temperatures of 300 to 400 °C with various strain rates and at temperatures of 400 to 450 °C with strain rates between 1 and 10 s−1. The level of dynamic recovery increases with increasing temperature and with decreasing strain rate. At the high deformation temperature of 450 °C with strain rates of 0.001 to 0.1 s−1, a partially recrystallized microstructure was observed, and the dynamic recrystallization (DRX) provided an alternative softening mechanism. Two kinds of DRX might operate at the high temperature, in which discontinuous dynamic recrystallization was involved at higher strain rates and continuous dynamic recrystallization was implied at lower strain rates.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:7
Numéro:1
Pages:p. 244-264
Version évaluée par les pairs:Oui
Date:2014
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-Zn-Mg-Cu alloy, hot compression, microstructure, decline ratio map, flow stress, dynamic softening mechanism, Alliage Al-Zn-Mg-Cu; compression à chaud, microstructure, tableau de taux de déclin, flux de stress, mécanisme de ramollissement
Déposé le:05 sept. 2017 20:39
Dernière modification:05 sept. 2017 20:39
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