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Effect of residual stresses on the onset of yielding in a Zr-based metallic glass / L. Wang in Acta materialia, Vol. 59 N° 20 (Décembre 2011) 

Public ISBD [article]  in Acta materialia > Vol. 59 N° 20 (Décembre 2011) . - pp. 7627–7633 Titre : Effect of residual stresses on the onset of yielding in a Zr-based metallic glass Type de document : texte imprimé Auteurs : L. Wang, Auteur ; H. Bei, Auteur ; Y.F. Gao, Auteur Année de publication : 2012 Article en page(s) : pp. 7627–7633 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Residual  stresses  Onset  of  yielding  Metallic  glasses  Nanoindentation  Glass  transition Résumé : Indentation experiments were performed on as-cast and elastically-bent-and-constrained Zr-based metallic glass samples to investigate the effect of strain rate and residual stresses on the onset of yielding in the material. The critical shear stress for the onset of yielding in the as-cast sample was found to be insensitive to the applied strain rate. By contrast, in the elastically-stressed sample, the maximum contact pressure from the Hertzian stress field at the onset of yielding was found to largely decrease under tensile residual stress, but only slightly increase under compressive residual stress. Despite the different residual stresses, the effective shear stress, i.e. the superimposition of residual and Hertzian stress fields, for the onset of yielding in the Zr-based metallic glass was essentially a constant. The constancy of the effective stress for the onset of yielding was discussed in light of a critical excess volume associated with the atomic structure upon loading. ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645411006665 [article] Effect of residual stresses on the onset of yielding in a Zr-based metallic glass [texte imprimé] / L. Wang, Auteur ; H. Bei, Auteur ; Y.F. Gao, Auteur . - 2012 . - pp. 7627–7633. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 59 N° 20 (Décembre 2011) . - pp. 7627–7633 Mots-clés : Residual  stresses  Onset  of  yielding  Metallic  glasses  Nanoindentation  Glass  transition Résumé : Indentation experiments were performed on as-cast and elastically-bent-and-constrained Zr-based metallic glass samples to investigate the effect of strain rate and residual stresses on the onset of yielding in the material. The critical shear stress for the onset of yielding in the as-cast sample was found to be insensitive to the applied strain rate. By contrast, in the elastically-stressed sample, the maximum contact pressure from the Hertzian stress field at the onset of yielding was found to largely decrease under tensile residual stress, but only slightly increase under compressive residual stress. Despite the different residual stresses, the effective shear stress, i.e. the superimposition of residual and Hertzian stress fields, for the onset of yielding in the Zr-based metallic glass was essentially a constant. The constancy of the effective stress for the onset of yielding was discussed in light of a critical excess volume associated with the atomic structure upon loading. ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645411006665