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Grain refinement of LY2 aluminum alloy induced by ultra-high plastic strain during multiple laser shock processing impacts / J.Z. Lu in Acta materialia, Vol. 58 N° 11 (Juin 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 11 (Juin 2010) . - pp. 3984–3994 Titre : Grain refinement of LY2 aluminum alloy induced by ultra-high plastic strain during multiple laser shock processing impacts Type de document : texte imprimé Auteurs : J.Z. Lu, Auteur ; K.Y. Luo, Auteur ; Y.K. Zhang, Auteur Année de publication : 2011 Article en page(s) : pp. 3984–3994 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Laser  shock  processing  LY2  aluminum  alloy  Residual  stress  Plastic  deformation  Micro-structure Résumé : The plastic deformation behavior and the effects of the impact time on the LY2 aluminum (Al) alloy during multiple laser shock processing (LSP) impacts were investigated. The residual stress in the near-surface region was determined by X-ray diffraction. In addition, the micro-structural features of the hardening layer were characterized by scanning electron microscopy, optical microscopy and transmission electron microscopy. It was found that the micro-structure was obviously refined due to the ultra-high plastic strain induced by multiple LSP impacts. The minimum grain size in the top surface after multiple LSP impacts was about 100–200 nm. The grain refinement process after multiple LSP impacts can be described as follows: (i) the formation and development of dislocation lines in original grains; (ii) dislocation tangles (DTs) and the formation of dense dislocation walls (DDWs); (iii) transformation of DTs and DDWs into subgrain boundaries; and (iv) evolution of the continuous dynamic recrystallization in subgrain boundaries to refined grain boundaries. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410001710 [article] Grain refinement of LY2 aluminum alloy induced by ultra-high plastic strain during multiple laser shock processing impacts [texte imprimé] / J.Z. Lu, Auteur ; K.Y. Luo, Auteur ; Y.K. Zhang, Auteur . - 2011 . - pp. 3984–3994. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 11 (Juin 2010) . - pp. 3984–3994 Mots-clés : Laser  shock  processing  LY2  aluminum  alloy  Residual  stress  Plastic  deformation  Micro-structure Résumé : The plastic deformation behavior and the effects of the impact time on the LY2 aluminum (Al) alloy during multiple laser shock processing (LSP) impacts were investigated. The residual stress in the near-surface region was determined by X-ray diffraction. In addition, the micro-structural features of the hardening layer were characterized by scanning electron microscopy, optical microscopy and transmission electron microscopy. It was found that the micro-structure was obviously refined due to the ultra-high plastic strain induced by multiple LSP impacts. The minimum grain size in the top surface after multiple LSP impacts was about 100–200 nm. The grain refinement process after multiple LSP impacts can be described as follows: (i) the formation and development of dislocation lines in original grains; (ii) dislocation tangles (DTs) and the formation of dense dislocation walls (DDWs); (iii) transformation of DTs and DDWs into subgrain boundaries; and (iv) evolution of the continuous dynamic recrystallization in subgrain boundaries to refined grain boundaries. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410001710