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Topological characteristics of plane sections of polycrystals / Gregory S. Rohrer in Acta materialia, Vol. 58 N° 10 (Juin 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 10 (Juin 2010) . - pp. 3805–3814 Titre : Topological characteristics of plane sections of polycrystals Type de document : texte imprimé Auteurs : Gregory S. Rohrer, Auteur ; Herbert M. Miller, Auteur Année de publication : 2011 Article en page(s) : pp. 3805–3814 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Topology  Microstructure  Grain  boundaries  Grain  boundary  junctions  Twin  grain  boundaries Résumé : Homology metrics have been used to assess the connectivity of grain boundary networks in plane sections of polycrystals. The analysis is based on orientation maps, and four characteristic microstructure types were examined: SrTiO3 microstructures with normal and bimodal grain size distributions and two Ni microstructures with different concentrations of Σ3 grain boundaries. The inverse connectivity, defined as the ratio of the number of independent pieces of the network to the number of closed loops, is proposed as a metric for the extent to which certain types of grain boundaries are connected. The variation in inverse connectivity with disorientation threshold, below which boundaries are excluded from the network, produces distinct signatures for the different microstructures. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410001734 [article] Topological characteristics of plane sections of polycrystals [texte imprimé] / Gregory S. Rohrer, Auteur ; Herbert M. Miller, Auteur . - 2011 . - pp. 3805–3814. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 10 (Juin 2010) . - pp. 3805–3814 Mots-clés : Topology  Microstructure  Grain  boundaries  Grain  boundary  junctions  Twin  grain  boundaries Résumé : Homology metrics have been used to assess the connectivity of grain boundary networks in plane sections of polycrystals. The analysis is based on orientation maps, and four characteristic microstructure types were examined: SrTiO3 microstructures with normal and bimodal grain size distributions and two Ni microstructures with different concentrations of Σ3 grain boundaries. The inverse connectivity, defined as the ratio of the number of independent pieces of the network to the number of closed loops, is proposed as a metric for the extent to which certain types of grain boundaries are connected. The variation in inverse connectivity with disorientation threshold, below which boundaries are excluded from the network, produces distinct signatures for the different microstructures. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410001734