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Elastically driven morphology of coherent trigonal precipitates inside a close-packed hexagonal matrix / Ludovic Thuinet in Acta materialia, Vol. 58 N° 6 (Avril 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 6 (Avril 2010) . - pp. 2250–2261 Titre : Elastically driven morphology of coherent trigonal precipitates inside a close-packed hexagonal matrix Type de document : texte imprimé Auteurs : Ludovic Thuinet, Auteur ; Alexandre Legris, Auteur Année de publication : 2011 Article en page(s) : pp. 2250–2261 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Precipitation  Micromechanical  modeling  Internal  stresses  Hydrides Résumé : The influence of a crystallographic symmetry break on the morphology of precipitates during the coherent precipitation of a trigonal phase in a close-packed hexagonal matrix is analyzed. It is pointed out that in spite of the isotropy of the stress-free strain of the precipitate in the basal plane, the existence of an extra elastic constant in the precipitate (associated to the loss of symmetry) induces a morphological evolution from a shape having a symmetry of revolution around the threefold axis to a needle-like one oriented along the compact directions in the basal plane. These general considerations are applied to the case of zirconium hydrides, the crystallography of which has recently been identified to be coherent with that of the αZr matrix. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008544 [article] Elastically driven morphology of coherent trigonal precipitates inside a close-packed hexagonal matrix [texte imprimé] / Ludovic Thuinet, Auteur ; Alexandre Legris, Auteur . - 2011 . - pp. 2250–2261. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 6 (Avril 2010) . - pp. 2250–2261 Mots-clés : Precipitation  Micromechanical  modeling  Internal  stresses  Hydrides Résumé : The influence of a crystallographic symmetry break on the morphology of precipitates during the coherent precipitation of a trigonal phase in a close-packed hexagonal matrix is analyzed. It is pointed out that in spite of the isotropy of the stress-free strain of the precipitate in the basal plane, the existence of an extra elastic constant in the precipitate (associated to the loss of symmetry) induces a morphological evolution from a shape having a symmetry of revolution around the threefold axis to a needle-like one oriented along the compact directions in the basal plane. These general considerations are applied to the case of zirconium hydrides, the crystallography of which has recently been identified to be coherent with that of the αZr matrix. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008544