期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 495, 期 1-2, 页码 119-125出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2007.09.091
关键词
Grain boundary adsorption; Wetting transitions; Prewetting transitions; Grain boundary phase diagrams
A previously developed model of the dependence of grain boundary (GB) segregation on GB character has been exercised to investigate solid-state wetting transitions at GBs, and their anisotropy. In the case of binary systems displaying a solid-state miscibility gap, it is shown that the wetting transition temperature for precipitates at a GB is anisotropic, and is inversely related to GB energy. The model also allows calculation of prewetting transitions and associated excursions in adsorption off phase coexistence. These transitions are first order below a prewetting critical point (T-PWC), and higher order at temperatures above T-PWC. Investigation of the prewetting behavior provides the means for construction of the two-dimensional phase diagram of a GB. (C) 2008 Elsevier B.V. All rights reserved.
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