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Mechanical assessment of ultrafine-grained nickel by microcompression experiment and finite element simulation

Schwaiger, Ruth ; Weber, Matthias ; Moser, Benedikt ; Gumbsch, Peter ; Kraft, Oliver

In: Journal of Materials Research, 2012, vol. 27, no. 1, p. 266-277

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    Titre
    • Mechanical assessment of ultrafine-grained nickel by microcompression experiment and finite element simulation
    Auteur
    • Schwaiger, Ruth. Karlsruhe Institute of Technology (KIT), Institute for Applied Materials (IAM), 76021 Karlsruhe, Germany
    • Weber, Matthias. Karlsruhe Institute of Technology (KIT), Institute for Applied Materials (IAM), 76021 Karlsruhe, Germany
    • Moser, Benedikt. EMPA Thun, Swiss Federal Institute for Materials Testing and Research, Laboratory for Materials Technology, 3602 Thun, Switzerland; and Suisse Technology Partners Ltd., 8212 Neuhausen, Switzerland
    • Gumbsch, Peter. Karlsruhe Institute of Technology (KIT), Institute for Applied Materials (IAM), 76021 Karlsruhe, Germany; and Fraunhofer Institute for Mechanics of Materials IWM, 79108 Freiburg, Germany
    • Kraft, Oliver. Karlsruhe Institute of Technology (KIT), Institute for Applied Materials (IAM), 76021 Karlsruhe, Germany
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Journal of Materials Research, 2012, vol. 27, no. 1, p. 266-277. Cambridge University Press
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:304854
    Summary
    Over the past two decades, nanoindentation has been the most versatile method for mechanical testing at small length scales. Because of large strain gradients, it does not allow for a straightforward identification of material parameters such as yield and tensile strength, though. This represents a major drawback and has led to the development of alternative microscale testing techniques with microcompression as one of the most popular ones today. In this research, the influence of the realistic sample configuration and unavoidable variations in the experimental conditions is studied systematically by combing in-situ microcompression experiments on ultrafine-grained nickel and finite element simulations. It will be demonstrated that neither qualitative let alone quantitative analyses are as straightforward as they may appear, which diminishes the apparent advantages of microcompression testing