Documents disponibles écrits par cet auteur

Application of ultrasonic methods to determine elastic anisotropy of polycrystalline copper processed by equal-channel angular pressing / Hanuš Seiner in Acta materialia, Vol. 58 N° 1 (Janvier 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 1 (Janvier 2010) . - pp. 235–247 Titre : Application of ultrasonic methods to determine elastic anisotropy of polycrystalline copper processed by equal-channel angular pressing Type de document : texte imprimé Auteurs : Hanuš Seiner, Auteur ; Lucie Bodnárová, Auteur ; Petr Sedlák, Auteur Année de publication : 2010 Article en page(s) : pp. 235–247 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Equal-channel  angular  pressing  Acoustic  methods  Copper Résumé : Anisotropy of elastic properties of ultrafine-grained polycrystalline copper after one, two and four passes of equal-channel angular pressing (ECAP) is investigated by means of ultrasonic methods. For each material, Young’s and shear moduli in the principal processing directions are evaluated and the symmetry and orientation of the anisotropy are identified. The relation between the determined symmetry and the processing mechanisms is discussed. It is shown that the material after one and two passes of ECAP exhibits a measurable anisotropy, while the material after the fourth pass behaves isotropically. Within the discussion, it is shown that the origin of the observed anisotropy may be attributed to the spatial arrangement of grain boundaries rather than to the crystallographic texture. In the light of this conclusion, the obtained results correspond well with optical and transmission electron microscopy observations of the microstructures of ECAPed materials documented in the literature. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409005977 [article] Application of ultrasonic methods to determine elastic anisotropy of polycrystalline copper processed by equal-channel angular pressing [texte imprimé] / Hanuš Seiner, Auteur ; Lucie Bodnárová, Auteur ; Petr Sedlák, Auteur . - 2010 . - pp. 235–247. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 1 (Janvier 2010) . - pp. 235–247 Mots-clés : Equal-channel  angular  pressing  Acoustic  methods  Copper Résumé : Anisotropy of elastic properties of ultrafine-grained polycrystalline copper after one, two and four passes of equal-channel angular pressing (ECAP) is investigated by means of ultrasonic methods. For each material, Young’s and shear moduli in the principal processing directions are evaluated and the symmetry and orientation of the anisotropy are identified. The relation between the determined symmetry and the processing mechanisms is discussed. It is shown that the material after one and two passes of ECAP exhibits a measurable anisotropy, while the material after the fourth pass behaves isotropically. Within the discussion, it is shown that the origin of the observed anisotropy may be attributed to the spatial arrangement of grain boundaries rather than to the crystallographic texture. In the light of this conclusion, the obtained results correspond well with optical and transmission electron microscopy observations of the microstructures of ECAPed materials documented in the literature. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409005977