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Impact of intrinsic localized modes of atomic motion on materials properties / M.E. Manley in Acta materialia, Vol. 58 N° 8 (Mai 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 8 (Mai 2010) . - pp. 2926–2935 Titre : Impact of intrinsic localized modes of atomic motion on materials properties Type de document : texte imprimé Auteurs : M.E. Manley, Auteur Année de publication : 2011 Article en page(s) : pp. 2926–2935 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Intrinsic  localized  modes  Point  defects  Diffusion  Mechanical  properties  Thermal  conductivity Résumé : Recent neutron and X-ray scattering measurements show intrinsic localized modes (ILMs) in metallic uranium and ionic sodium iodide. Here, the role ILMs play in the behavior of these materials is examined. With the thermal activation of ILMs, thermal expansion is enhanced, made more anisotropic, and, at a microscopic level, becomes inhomogeneous. Interstitial diffusion, ionic conductivity, the annealing rate of radiation damage, and void growth are all influenced by ILMs. The lattice thermal conductivity is suppressed at the ILM activation temperature, while no impact is observed in the electrical conductivity. This complement of transport properties suggests that ILMs could improve thermoelectric performance. Ramifications also include thermal ratcheting, a transition from brittle to ductile fracture, and possibly a phase transformation in uranium. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000352 [article] Impact of intrinsic localized modes of atomic motion on materials properties [texte imprimé] / M.E. Manley, Auteur . - 2011 . - pp. 2926–2935. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 8 (Mai 2010) . - pp. 2926–2935 Mots-clés : Intrinsic  localized  modes  Point  defects  Diffusion  Mechanical  properties  Thermal  conductivity Résumé : Recent neutron and X-ray scattering measurements show intrinsic localized modes (ILMs) in metallic uranium and ionic sodium iodide. Here, the role ILMs play in the behavior of these materials is examined. With the thermal activation of ILMs, thermal expansion is enhanced, made more anisotropic, and, at a microscopic level, becomes inhomogeneous. Interstitial diffusion, ionic conductivity, the annealing rate of radiation damage, and void growth are all influenced by ILMs. The lattice thermal conductivity is suppressed at the ILM activation temperature, while no impact is observed in the electrical conductivity. This complement of transport properties suggests that ILMs could improve thermoelectric performance. Ramifications also include thermal ratcheting, a transition from brittle to ductile fracture, and possibly a phase transformation in uranium. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000352