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Anisotropic elastic constants and thermal expansivities in monocrystal CrB2, TiB2, and ZrB2 / Norihiko L. Okamoto in Acta materialia, Vol. 58 N° 1 (Janvier 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 1 (Janvier 2010) . - pp. 76–84 Titre : Anisotropic elastic constants and thermal expansivities in monocrystal CrB2, TiB2, and ZrB2 Type de document : texte imprimé Auteurs : Norihiko L. Okamoto, Auteur ; Misato Kusakari, Auteur ; Katsushi Tanaka, Auteur Année de publication : 2010 Article en page(s) : pp. 76–84 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Borides  Transition  metals  Monocrystals  Anisotropy  High  temperatures Résumé : The elastic constants and thermal expansivities in monocrystals of three transition-metal diborides with the AlB2 structure, CrB2, TiB2, and ZrB2, have been investigated in the temperature ranges from 300 to 1373 K and from 300 to 1073 K. The anisotropic parameters deduced from the measured elastic constants and thermal expansivities indicate that of the three diborides, the anisotropy is the most and least significant in CrB2 and ZrB2, respectively. The factors determining the significance in anisotropy in atomic bonding in AlB2-type diborides are analyzed by an approach similar to the valence-force-field method and are discussed in terms of the deformation of the electronic charge around the metal atoms occurring to fit themselves in the (0 0 0 1) basal plane. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409005710 [article] Anisotropic elastic constants and thermal expansivities in monocrystal CrB2, TiB2, and ZrB2 [texte imprimé] / Norihiko L. Okamoto, Auteur ; Misato Kusakari, Auteur ; Katsushi Tanaka, Auteur . - 2010 . - pp. 76–84. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 1 (Janvier 2010) . - pp. 76–84 Mots-clés : Borides  Transition  metals  Monocrystals  Anisotropy  High  temperatures Résumé : The elastic constants and thermal expansivities in monocrystals of three transition-metal diborides with the AlB2 structure, CrB2, TiB2, and ZrB2, have been investigated in the temperature ranges from 300 to 1373 K and from 300 to 1073 K. The anisotropic parameters deduced from the measured elastic constants and thermal expansivities indicate that of the three diborides, the anisotropy is the most and least significant in CrB2 and ZrB2, respectively. The factors determining the significance in anisotropy in atomic bonding in AlB2-type diborides are analyzed by an approach similar to the valence-force-field method and are discussed in terms of the deformation of the electronic charge around the metal atoms occurring to fit themselves in the (0 0 0 1) basal plane. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409005710