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X-ray diffraction study of the phase purity, order and texture of ductile B2 intermetallics / R.P. Mulay in Acta materialia, Vol. 58 N° 7 (Avril 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 7 (Avril 2010) . - pp. 2788–2796 Titre : X-ray diffraction study of the phase purity, order and texture of ductile B2 intermetallics Type de document : texte imprimé Auteurs : R.P. Mulay, Auteur ; J.A. Wollmershauser, Auteur ; M.A. Heisel, Auteur Année de publication : 2011 Article en page(s) : pp. 2788–2796 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Ductility  Intermetallics  Ordering  Preferred  orientation  Dislocations Résumé : Representatives (AgY, CuY, AgEr, CuDy, MgY and MgCe) of the newly discovered family of ductile stoichiometric B2 intermetallic (metal–rare-earth element, MR) compounds were characterized by X-ray diffraction, to determine if their anomalous ductility is related to an exceptional level of phase purity, lack of chemical ordering or a strong crystallographic texture. Brittle NiAl served as an anti-type in this study. We found that all of the rare-earth compounds, except MgY, have a significant volume fraction (∼5–20 vol.%) of second phases (M2R intermetallics and R2O3 oxides), which has not been reported in previous studies of these materials. The most ductile of observed MR compounds, AgY, is highly ordered. A moderate texture was observed in AgY, which may explain its higher ductility (using polycrystal modeling) as compared to other MR compounds. However, the intrinsic polycrystalline ductility of these compounds in the randomly textured state (like that observed in CuY) still has no specific, definitive explanation. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000406 [article] X-ray diffraction study of the phase purity, order and texture of ductile B2 intermetallics [texte imprimé] / R.P. Mulay, Auteur ; J.A. Wollmershauser, Auteur ; M.A. Heisel, Auteur . - 2011 . - pp. 2788–2796. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 7 (Avril 2010) . - pp. 2788–2796 Mots-clés : Ductility  Intermetallics  Ordering  Preferred  orientation  Dislocations Résumé : Representatives (AgY, CuY, AgEr, CuDy, MgY and MgCe) of the newly discovered family of ductile stoichiometric B2 intermetallic (metal–rare-earth element, MR) compounds were characterized by X-ray diffraction, to determine if their anomalous ductility is related to an exceptional level of phase purity, lack of chemical ordering or a strong crystallographic texture. Brittle NiAl served as an anti-type in this study. We found that all of the rare-earth compounds, except MgY, have a significant volume fraction (∼5–20 vol.%) of second phases (M2R intermetallics and R2O3 oxides), which has not been reported in previous studies of these materials. The most ductile of observed MR compounds, AgY, is highly ordered. A moderate texture was observed in AgY, which may explain its higher ductility (using polycrystal modeling) as compared to other MR compounds. However, the intrinsic polycrystalline ductility of these compounds in the randomly textured state (like that observed in CuY) still has no specific, definitive explanation. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000406