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Mechanical behavior and microstructural evolution of a Mg AZ31 sheet at dynamic strain rates / I. Ulacia in Acta materialia, Vol. 58 N° 8 (Mai 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 8 (Mai 2010) . - pp. 2988–2998 Titre : Mechanical behavior and microstructural evolution of a Mg AZ31 sheet at dynamic strain rates Type de document : texte imprimé Auteurs : I. Ulacia, Auteur ; N.V. Dudamell, Auteur ; F. Gálvez, Auteur Année de publication : 2011 Article en page(s) : pp. 2988–2998 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : AZ31  High  strain  rate  Twinning  Slip  Anisotropy Résumé : The mechanical behavior of an AZ31 Mg sheet has been investigated at high strain rate (103 s−1) and compared with that observed at low rates (10−3 s−1). Dynamic tests were carried out using a Hopkinson bar at temperatures between 25 and 400 °C. Tensile tests were carried out along the rolling and transverse directions and compression tests along the rolling and the normal directions in both strain rate ranges. The tension–compression yield asymmetry as well as the yield and flow stress in-plane and out-of-plane anisotropies were investigated. The microstructure of the initial and tested samples was examined by electron backscatter diffraction. The dynamic mechanical behavior is characterized by the following observations. At high temperatures the yield asymmetry and the yield anisotropies remain present and twinning is highly active. The rate of decrease in the critical resolved shear stress of non-basal systems with temperature is smaller than at quasi-static rates. Rotational recrystallization mechanisms are activated. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000431 [article] Mechanical behavior and microstructural evolution of a Mg AZ31 sheet at dynamic strain rates [texte imprimé] / I. Ulacia, Auteur ; N.V. Dudamell, Auteur ; F. Gálvez, Auteur . - 2011 . - pp. 2988–2998. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 8 (Mai 2010) . - pp. 2988–2998 Mots-clés : AZ31  High  strain  rate  Twinning  Slip  Anisotropy Résumé : The mechanical behavior of an AZ31 Mg sheet has been investigated at high strain rate (103 s−1) and compared with that observed at low rates (10−3 s−1). Dynamic tests were carried out using a Hopkinson bar at temperatures between 25 and 400 °C. Tensile tests were carried out along the rolling and transverse directions and compression tests along the rolling and the normal directions in both strain rate ranges. The tension–compression yield asymmetry as well as the yield and flow stress in-plane and out-of-plane anisotropies were investigated. The microstructure of the initial and tested samples was examined by electron backscatter diffraction. The dynamic mechanical behavior is characterized by the following observations. At high temperatures the yield asymmetry and the yield anisotropies remain present and twinning is highly active. The rate of decrease in the critical resolved shear stress of non-basal systems with temperature is smaller than at quasi-static rates. Rotational recrystallization mechanisms are activated. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000431