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Dynamic self-organization in Cu alloys under ion irradiation / S. W. Chee in Acta materialia, Vol. 58 N° 12 (Juillet 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 12 (Juillet 2010) . - pp. 4088–4099 Titre : Dynamic self-organization in Cu alloys under ion irradiation Type de document : texte imprimé Auteurs : S. W. Chee, Auteur ; B. Stumphy, Auteur ; N.Q. Vo, Auteur Année de publication : 2011 Article en page(s) : pp. 4088–4099 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Copper  alloys  Nanocrystalline  materials  Phase  separation  Radiation  effects  Self-organization  and  patterning Résumé : Phase separation in dilute Cu(1–x)Mx films under irradiation with 1.8 MeV Kr+ ions at elevated temperatures has been studied for 0.10 < x < 0.15 and M = Ag, Co, Fe, Mo and Nb. In all systems compositional patterning was observed on a mesoscopic length scale within a fixed temperature interval. At lower temperatures most of the alloys formed nearly homogeneous solid solutions, while at higher temperatures these same alloys underwent macroscopic phase separation. The upper temperature limit for patterning increased with decreasing solute diffusivity in the Cu matrix, reported in the absence of irradiation. The heat of mixing of the alloy, however, also played a role in the patterning behavior. For Cu90Mo10, which has a high positive heat of mixing, no upper or lower temperature limits for patterning were observed. Molecular dynamics computer simulations reported here explain why Cu90Mo10 behaves differently from the other alloys. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410001941 [article] Dynamic self-organization in Cu alloys under ion irradiation [texte imprimé] / S. W. Chee, Auteur ; B. Stumphy, Auteur ; N.Q. Vo, Auteur . - 2011 . - pp. 4088–4099. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 12 (Juillet 2010) . - pp. 4088–4099 Mots-clés : Copper  alloys  Nanocrystalline  materials  Phase  separation  Radiation  effects  Self-organization  and  patterning Résumé : Phase separation in dilute Cu(1–x)Mx films under irradiation with 1.8 MeV Kr+ ions at elevated temperatures has been studied for 0.10 < x < 0.15 and M = Ag, Co, Fe, Mo and Nb. In all systems compositional patterning was observed on a mesoscopic length scale within a fixed temperature interval. At lower temperatures most of the alloys formed nearly homogeneous solid solutions, while at higher temperatures these same alloys underwent macroscopic phase separation. The upper temperature limit for patterning increased with decreasing solute diffusivity in the Cu matrix, reported in the absence of irradiation. The heat of mixing of the alloy, however, also played a role in the patterning behavior. For Cu90Mo10, which has a high positive heat of mixing, no upper or lower temperature limits for patterning were observed. Molecular dynamics computer simulations reported here explain why Cu90Mo10 behaves differently from the other alloys. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410001941