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Principles of ECAP–Conform as a continuous process for achieving grain refinement / Cheng Xu in Acta materialia, Vol. 58 N° 4 (Fevrier 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 4 (Fevrier 2010) . - pp. 1379–1386 Titre : Principles of ECAP–Conform as a continuous process for achieving grain refinement : Application to an aluminum alloy Type de document : texte imprimé Auteurs : Cheng Xu, Auteur ; Steven Schroeder, Auteur ; Patrick B. Berbon, Auteur Année de publication : 2011 Article en page(s) : pp. 1379–1386 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Conform  Equal-channel  angular  pressing  Hardness  Homogeneity  Plastic  anisotropy Résumé : Equal-channel angular pressing (ECAP) combined with the Conform process provides a solution for the continuous production of ultrafine-grained materials. Rods of a commercial Al-6061 alloy were processed by ECAP–Conform at room temperature for up to a total of four passes. Microstructural observations showed significant grain refinement but with elongated grains after four passes with average widths of ∼150 nm and lengths of ∼1.2 μm when viewed on the longitudinal planes. Microhardness measurements after a single pass revealed inhomogeneities both on the cross-sectional planes and along the rod. After processing through four passes there was reasonable homogeneity throughout the rod. Measurements of the shear strengths in two orthogonal directions perpendicular to the extrusion axis showed significant strengthening after ECAP–Conform and there was no evidence for any plastic anisotropy after processing through four passes. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409007472 [article] Principles of ECAP–Conform as a continuous process for achieving grain refinement : Application to an aluminum alloy [texte imprimé] / Cheng Xu, Auteur ; Steven Schroeder, Auteur ; Patrick B. Berbon, Auteur . - 2011 . - pp. 1379–1386. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 4 (Fevrier 2010) . - pp. 1379–1386 Mots-clés : Conform  Equal-channel  angular  pressing  Hardness  Homogeneity  Plastic  anisotropy Résumé : Equal-channel angular pressing (ECAP) combined with the Conform process provides a solution for the continuous production of ultrafine-grained materials. Rods of a commercial Al-6061 alloy were processed by ECAP–Conform at room temperature for up to a total of four passes. Microstructural observations showed significant grain refinement but with elongated grains after four passes with average widths of ∼150 nm and lengths of ∼1.2 μm when viewed on the longitudinal planes. Microhardness measurements after a single pass revealed inhomogeneities both on the cross-sectional planes and along the rod. After processing through four passes there was reasonable homogeneity throughout the rod. Measurements of the shear strengths in two orthogonal directions perpendicular to the extrusion axis showed significant strengthening after ECAP–Conform and there was no evidence for any plastic anisotropy after processing through four passes. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409007472