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Effect of pre-existing shear bands on the tensile mechanical properties of a bulk metallic glass / Q. P. Cao in Acta materialia, Vol. 58 N° 4 (Fevrier 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 4 (Fevrier 2010) . - pp. 1276–1292 Titre : Effect of pre-existing shear bands on the tensile mechanical properties of a bulk metallic glass Type de document : texte imprimé Auteurs : Q. P. Cao, Auteur ; J.W. Liu, Auteur ; K.J. Yang, Auteur Année de publication : 2011 Article en page(s) : pp. 1276–1292 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Metallic  glasses  Rolling  Shear  bands  Tension  test  In  situ  SEM Résumé : Bulk Zr64.13Cu15.75Ni10.12Al10 metallic glass has been rolled at room temperature in two different directions, and the dependences of microstructure and tensile mechanical property on the degree of deformation and rolling directions have been investigated. No deformation-induced crystallization occurs except for shear bands. Shear band formation in conjugated directions is achieved in the specimen rolled in two directions, while rolling in one direction induces shear band formation only in a single direction. Pre-existing properly spaced soft inhomogeneities can stabilize shear bands and lead to tensile plastic strain, and the efficient intersection of shear bands in conjugated directions results in work-hardening behavior, which is further confirmed by in situ tensile scanning electron microscopic observation. Based on the experimental results obtained in two different specimen geometries and finite element analysis, it is deduced that a normal-stress-modified maximum shear stress criterion rather than a shear plane criterion can describe the conditions for the formation of shear bands in uniaxial tension. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409007265 [article] Effect of pre-existing shear bands on the tensile mechanical properties of a bulk metallic glass [texte imprimé] / Q. P. Cao, Auteur ; J.W. Liu, Auteur ; K.J. Yang, Auteur . - 2011 . - pp. 1276–1292. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 4 (Fevrier 2010) . - pp. 1276–1292 Mots-clés : Metallic  glasses  Rolling  Shear  bands  Tension  test  In  situ  SEM Résumé : Bulk Zr64.13Cu15.75Ni10.12Al10 metallic glass has been rolled at room temperature in two different directions, and the dependences of microstructure and tensile mechanical property on the degree of deformation and rolling directions have been investigated. No deformation-induced crystallization occurs except for shear bands. Shear band formation in conjugated directions is achieved in the specimen rolled in two directions, while rolling in one direction induces shear band formation only in a single direction. Pre-existing properly spaced soft inhomogeneities can stabilize shear bands and lead to tensile plastic strain, and the efficient intersection of shear bands in conjugated directions results in work-hardening behavior, which is further confirmed by in situ tensile scanning electron microscopic observation. Based on the experimental results obtained in two different specimen geometries and finite element analysis, it is deduced that a normal-stress-modified maximum shear stress criterion rather than a shear plane criterion can describe the conditions for the formation of shear bands in uniaxial tension. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409007265