Ontology type: schema:ScholarlyArticle Open Access: True
2015-12
AUTHORSM-S Colla, B Amin-Ahmadi, H Idrissi, L Malet, S Godet, J-P Raskin, D Schryvers, T Pardoen
ABSTRACTThe high-rate sensitivity of nanostructured metallic materials demonstrated in the recent literature is related to the predominance of thermally activated deformation mechanisms favoured by a large density of internal interfaces. Here we report time-resolved high-resolution electron transmission microscopy creep tests on thin nanograined films using on-chip nanomechanical testing. Tests are performed on palladium, which exhibited unexpectedly large creep rates at room temperature. Despite the small 30-nm grain size, relaxation is found to be mediated by dislocation mechanisms. The dislocations interact with the growth nanotwins present in the grains, leading to a loss of coherency of twin boundaries. The density of stored dislocations first increases with applied deformation, and then decreases with time to drive additional deformation while no grain boundary mechanism is observed. This fast relaxation constitutes a key issue in the development of various micro- and nanotechnologies such as palladium membranes for hydrogen applications. More... »
PAGES5922
http://scigraph.springernature.com/pub.10.1038/ncomms6922
DOIhttp://dx.doi.org/10.1038/ncomms6922
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PUBMEDhttps://www.ncbi.nlm.nih.gov/pubmed/25557273
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