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ECAP with back pressure for optimum strength and ductility in aluminium alloy 6016 / P.W.J. Mckenzie in Acta materialia, Vol. 58 N° 9 (Mai 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 9 (Mai 2010) . - pp. 3198–3211 Titre : ECAP with back pressure for optimum strength and ductility in aluminium alloy 6016 : Part 1: Microstructure Type de document : texte imprimé Auteurs : P.W.J. Mckenzie, Auteur ; R. Lapovok, Auteur Année de publication : 2011 Article en page(s) : pp. 3198–3211 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Equal  channel  angular  pressing  (ECAP)  Ultrafine  grained  (UFG)  Aluminium  alloy  6016  Tensile  test  Strain  hardening Résumé : The microstructure evolution of aluminium alloy 6016 processed by equal channel angular pressing (ECAP) was investigated for different processing parameters. A number of heat treatments, including F, W, O, T4, T6 and T7, were evaluated for workability required to withstand the severe plastic deformation. It was found that this aluminium alloy had limited workability at room temperature in the F, W and T4 tempers, especially at low levels of applied back pressure, while both the O and T7 tempers can be pressed to a very high strain (∼1800%) without failure. Considering that the O temper has better utility for industry because of decreased preparation time, a complete study of microstructure after ECAP processing with and without back pressure was carried out for the O temper. The thermal stability of microstructure after 16 ECAP passes with 200 MPa of back pressure was also studied. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000522 [article] ECAP with back pressure for optimum strength and ductility in aluminium alloy 6016 : Part 1: Microstructure [texte imprimé] / P.W.J. Mckenzie, Auteur ; R. Lapovok, Auteur . - 2011 . - pp. 3198–3211. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 9 (Mai 2010) . - pp. 3198–3211 Mots-clés : Equal  channel  angular  pressing  (ECAP)  Ultrafine  grained  (UFG)  Aluminium  alloy  6016  Tensile  test  Strain  hardening Résumé : The microstructure evolution of aluminium alloy 6016 processed by equal channel angular pressing (ECAP) was investigated for different processing parameters. A number of heat treatments, including F, W, O, T4, T6 and T7, were evaluated for workability required to withstand the severe plastic deformation. It was found that this aluminium alloy had limited workability at room temperature in the F, W and T4 tempers, especially at low levels of applied back pressure, while both the O and T7 tempers can be pressed to a very high strain (∼1800%) without failure. Considering that the O temper has better utility for industry because of decreased preparation time, a complete study of microstructure after ECAP processing with and without back pressure was carried out for the O temper. The thermal stability of microstructure after 16 ECAP passes with 200 MPa of back pressure was also studied. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000522

ECAP with back pressure for optimum strength and ductility in aluminium alloy 6016 / P.W.J. Mckenzie in Acta materialia, Vol. 58 N° 9 (Mai 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 9 (Mai 2010) . - pp. 3212–3222 Titre : ECAP with back pressure for optimum strength and ductility in aluminium alloy 6016 : Part 2: Mechanical properties and texture Type de document : texte imprimé Auteurs : P.W.J. Mckenzie, Auteur ; R. Lapovok, Auteur Année de publication : 2011 Article en page(s) : pp. 3212–3222 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Equal  channel  angular  pressing  (ECAP)  Ultrafine  grained  (UFG)  Aluminium  alloy  6016  Tensile  test  Strain  hardening Résumé : The simultaneous increase in strength and ductility of aluminium alloy 6016 processed by equal channel angular pressing (ECAP) was investigated. A complete study of microstructure, texture and mechanical properties after ECAP processing with and without back pressure was carried out for the O temper. The simultaneous increase in strength and ductility of AA6016-O with number of ECAP passes was explained by the use of back pressure during ECAP. A maximum ductility of ∼100% was obtained at the temperature of 200 °C and strain rate of 10−4 s−1, which is a significant improvement on the ductility exhibited by AA6016 (∼89%) after a conventional thermomechanical treatment at a much higher temperature of 500 °C. The mechanical behaviour was interpreted in the context of the textures developed in the material. A significant amount of texture rotation due to applied back pressure was found. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000510 [article] ECAP with back pressure for optimum strength and ductility in aluminium alloy 6016 : Part 2: Mechanical properties and texture [texte imprimé] / P.W.J. Mckenzie, Auteur ; R. Lapovok, Auteur . - 2011 . - pp. 3212–3222. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 9 (Mai 2010) . - pp. 3212–3222 Mots-clés : Equal  channel  angular  pressing  (ECAP)  Ultrafine  grained  (UFG)  Aluminium  alloy  6016  Tensile  test  Strain  hardening Résumé : The simultaneous increase in strength and ductility of aluminium alloy 6016 processed by equal channel angular pressing (ECAP) was investigated. A complete study of microstructure, texture and mechanical properties after ECAP processing with and without back pressure was carried out for the O temper. The simultaneous increase in strength and ductility of AA6016-O with number of ECAP passes was explained by the use of back pressure during ECAP. A maximum ductility of ∼100% was obtained at the temperature of 200 °C and strain rate of 10−4 s−1, which is a significant improvement on the ductility exhibited by AA6016 (∼89%) after a conventional thermomechanical treatment at a much higher temperature of 500 °C. The mechanical behaviour was interpreted in the context of the textures developed in the material. A significant amount of texture rotation due to applied back pressure was found. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000510