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Hot deformation and processing maps of Al-15%B4C composites containing Sc and Zr

Qin Jian, Zhang Zhan et Chen X-Grant. (2017). Hot deformation and processing maps of Al-15%B4C composites containing Sc and Zr. Journal of Materials Engineering and Performance, 26, (4), p. 1673-1684.

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URL officielle: http://dx.doi.org/doi:10.1007/s11665-017-2622-x

Résumé

Hot deformation behavior and processing maps of three Al-15%B4C composites denoted as the base composite (Al-15vol.%B4C), S40 (Al-15vol.%B4C-0.4wt.%Sc) and SZ40 (Al-15 vol.%B4C-0.4wt.%Sc-0.24wt.%Zr) were studied by uniaxial compression tests performed at various deformation temperatures and strain rates. The constitutive equations of the three composites were established to describe the effect of the temperature and strain rate on hot deformation behavior. Using the established constitutive equations, the predicted flow stresses on various deformation conditions agreed well with the experimental data. The peak flow stress of the composites increased with the addition of Sc and Zr, attributing to the synthetic effect of solute atoms and dynamic precipitation. The addition of Sc and Zr increased the activation energy for hot deformation of Al-B4C composites. The processing maps of the three composites were constructed to evaluate the hot workability of the composites. The safe domains with optimal deformation conditions were identified for all three composites. In the safe domains, dynamic recovery and dynamic recrystallization were involved as softening mechanisms. The addition of Sc and Zr limited the dynamic softening process, especially for dynamic recrystallization. The microstructure analysis revealed that the flow instability was attributed to the void formation, cracking and flow localization during hot deformation of the composites.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:26
Numéro:4
Pages:p. 1673-1684
Version évaluée par les pairs:Oui
Date:Avril 2017
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-B4C composites, hot deformation, processing map, Sc and Zr, microstructure, composés Al-B4C, déformation à chaud, carte de traitement, Sc et Zr
Déposé le:06 juin 2017 15:04
Dernière modification:06 juin 2017 15:04
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