期刊
ACTA MATERIALIA
卷 56, 期 19, 页码 5640-5652出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2008.07.036
关键词
Nanoindentation; Grain boundaries; Grain boundary junctions; Indentation size effect
资金
- Israel Science Foundation
- Jewish Communities of Germany Research Fund
We performed a nanoindentation study of the inherent mechanical properties of grain boundaries and their triple junctions in molybdenum tricrystals of controlled geometry grown from the melt. A region with increased hardness is revealed in the vicinity of all grain boundaries studied. The width of this region is about 2 mu m and the maximum relative increase of hardness at the grain boundary is about 30%. The local nanohardness at the triple junctions was found to be higher than that at the grain boundaries. This effect is analyzed in terms of the indentation size effect model of Nix and Gao, assuming that the grain boundaries represent ideal barriers for the first nucleated dislocation loops. We calibrated the parameters of the developed model using the data for nanohardness of grain boundaries. The model predicts values of nanohardness at the triple junctions which are in good agreement with the experimental results. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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