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Studying grain boundary regions in polycrystalline materials using spherical nano-indentation and orientation imaging microscopy

Pathak, Siddhartha ; Michler, Johann ; Wasmer, Kilian ; Kalidindi, Surya

In: Journal of Materials Science, 2012, vol. 47, no. 2, p. 815-823

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    Title
    • Studying grain boundary regions in polycrystalline materials using spherical nano-indentation and orientation imaging microscopy
    Author
    • Pathak, Siddhartha. EMPA, Swiss Federal Laboratory for Materials Science and Technology, Feuerwerkerstrasse 39, 3602, Thun, Switzerland
    • Michler, Johann. EMPA, Swiss Federal Laboratory for Materials Science and Technology, Feuerwerkerstrasse 39, 3602, Thun, Switzerland
    • Wasmer, Kilian. EMPA, Swiss Federal Laboratory for Materials Science and Technology, Feuerwerkerstrasse 39, 3602, Thun, Switzerland
    • Kalidindi, Surya. Department of Materials Science and Engineering, Drexel University, 19104, Philadelphia, PA, USA
    Document Type
    • Postprint
    Language
    • English
    Published in
    • Journal of Materials Science, 2012, vol. 47, no. 2, p. 815-823. Springer US; http://www.springer-ny.com
    Other Version
    Classification
    • Engineering
    OAI-PMH Identifier
    • oai:doc.rero.ch:314912
    Summary
    In this article, we report on the application of our spherical nanoindentation data analysis protocols to study the mechanical response of grain boundary regions in as-cast and 30% deformed polycrystalline Fe-3%Si steel. In particular, we demonstrate that it is possible to investigate the role of grain boundaries in the mechanical deformation of polycrystalline samples by systematically studying the changes in the indentation stress-strain curves as a function of the distance from the grain boundary. Such datasets, when combined with the local crystal lattice orientation information obtained using orientation imaging microscopy, open new avenues for characterizing the mechanical behavior of grain boundaries based on their misorientation angle, dislocation density content near the boundary, and their propensity for dislocation source/sink behavior