期刊
ACTA MATERIALIA
卷 58, 期 5, 页码 1589-1598出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2009.11.002
关键词
Nanoindentation; Grain boundaries; Thin films
资金
- Israel Science Foundation
- Green Research Fund
Quasi-static nanoindentation tests were performed on polycrystalline Ni films sputter deposited on basal plane-oriented sapphire substrates. In the majority of tests a combined elasto-plastic response of the film was observed, without detectable displacement bursts during loading. In some of the tests a single large displacement burst was observed slightly below or at the maximal load (75 or 50 mu N). The residual plastic depth of the corresponding indents was close to the film thickness. These large displacement bursts were interpreted as manifestations of intergranular brittle fracture in the indented region. The strength of the disclination-type defect at the triple junctions leading to brittle fracture at the grain boundaries was estimated based on the theory of strain gradient plasticity. (c) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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