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The influence of indenter tip rounding on the indentation size effect / Xiao Guang Qiao in Acta materialia, Vol. 58 N° 10 (Juin 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 10 (Juin 2010) . - pp. 3690–3700 Titre : The influence of indenter tip rounding on the indentation size effect Type de document : texte imprimé Auteurs : Xiao Guang Qiao, Auteur ; Marco J. Starink, Auteur ; Nong Gao, Auteur Année de publication : 2011 Article en page(s) : pp. 3690–3700 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Ultrafine-grained  (UFG)  aluminium  Nanoindentation  Geometrically  necessary  dislocations  Tip  rounding  effect Résumé : A model was developed to interpret the indentation size effect (ISE). The model considers the tip wear effect, causing a rounded tip, the plastic zone size and various strengthening contributions, including geometrically necessary dislocations, pre-existing statistically stored dislocations and grain size. It is shown that the shape of the worn tip can be effectively determined through calibration experiments. The model is applied to predict dislocation densities, and shows a good correspondence with published data on dislocation densities in copper single crystals. The predicted ISE is shown to be in good correspondence with published data on a range of metals, and an improvement over existing models is demonstrated. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410001497 [article] The influence of indenter tip rounding on the indentation size effect [texte imprimé] / Xiao Guang Qiao, Auteur ; Marco J. Starink, Auteur ; Nong Gao, Auteur . - 2011 . - pp. 3690–3700. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 10 (Juin 2010) . - pp. 3690–3700 Mots-clés : Ultrafine-grained  (UFG)  aluminium  Nanoindentation  Geometrically  necessary  dislocations  Tip  rounding  effect Résumé : A model was developed to interpret the indentation size effect (ISE). The model considers the tip wear effect, causing a rounded tip, the plastic zone size and various strengthening contributions, including geometrically necessary dislocations, pre-existing statistically stored dislocations and grain size. It is shown that the shape of the worn tip can be effectively determined through calibration experiments. The model is applied to predict dislocation densities, and shows a good correspondence with published data on dislocation densities in copper single crystals. The predicted ISE is shown to be in good correspondence with published data on a range of metals, and an improvement over existing models is demonstrated. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410001497