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Role of the solid/liquid interface faceting in rapid penetration of a liquid phase along grain boundaries |
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| Affiliation: | 1. Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran;2. Department of Advanced Materials Engineering, Dong-Eui University, Busan 614-714, Korea;3. Department of Materials Science & Engineering, The Ohio State University, Columbus, OH 43221, USA;4. POSCO Technical Research Laboratories, Gwangyang 545-090, Korea;1. Advanced Nuclear Energy Research Team, Department of Nuclear Science and Technology, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China;2. China General Nuclear Power Corporation (CGN), China Nuclear Power Technology Research Institute Co. Ltd., Shenzhen 518026, China |
| Abstract: | A model is developed for describing rapid penetration of a liquid phase along a grain boundary. It is based on the assumption of a highly faceted solid/liquid interface. Experiments showing the faceting of the solid/liquid interface in grain boundary penetration experiments are presented. The basic hypothesis of the model are an undersaturated solid and a positive spreading coefficient of the liquid phase along the grain boundary. The model explains the apparent concave shape of the tip of the groove and the reason why penetration also occurs if the liquid phase is pre-saturated with the material of the solid. Moreover it predicts a power law with an exponent close to unity for the time dependence of the depth of penetration of the liquid layer along the grain boundary. |
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