期刊
MATERIALS LETTERS
卷 187, 期 -, 页码 7-10出版社
ELSEVIER
DOI: 10.1016/j.matlet.2016.10.055
关键词
Nanocrystalline materials; Grain boundaries; Cemented carbides; Complexion
资金
- Ministry of Education and Science of the Russian Federation in the framework of the Increase Competitiveness Program of MISiS
The interface structure of tungsten carbide cobalt grain boundaries in a WC-Co cemented carbide specimen is studied by aberration corrected high-resolution transmission electron microscopy. A two-atom thick chemically ordered layer is found on straight facets of a WC grain. No chemically ordered layers were found on curved segments of the same WC grain. The complexion appears to form only at certain facets of the interface, where the crystallographic orientation between the WC and Co crystal lattices results in high compatibility stresses across the interface. The complexion in form of an intermediate phase is present at such interfaces to accommodate the long-range stresses and to facilitate the lattice matching.
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