| Grain boundary wetting is a popular physical-chemical phenomenon occurring during preparing and processing of polycrystalline materials. Its behavior is closely related to the structure and characteristic of grain boundary or interface. Research on high magnetic field effects on grain boundary wetting is of great scientific significance for the preparation of advanced materials and the control of grain boundary embritlement by applying an external magnetic field. In this study, the grain boundary (36.9°<001> and45°<001>GB)wetting by Zn-rich melt in Fe-6.5wt.%Si bicrystals under high magnetic fields were investiged by means of SEM and EPMA. The following conclusions are obtained:1. After magnetic field annlealing at660℃, as compared to the bicrystals with45°<001>GB, the contact angles observed from the36.9°<001> bicrystals are relatively high, which is known as typical parital wetting characteristic.2. When annealing at660℃, the penetration length of Zn-rich melt along the45°<001> GB increases with increasing of magnetic field intensity;3. As compared with the bicrystals with45°<001>GB non-magneticially annealed at660℃, the ratio of depth to width for the GB groove formed along the45°<001> GB by Zn rich melt under high magnetic field is relatively small, and the ratio increase with increasing of magnetic field intensity;4. For the bicrystals annealed at680℃, with increasing of magnetic field intensity, the ratio of depth to width for the GB groove formed along the45°<001> GB by Zn rich melt increase, while the ratio decrease for the GB groove formed along the36.9°<001>GB。 The increase of ratio of depth to width for a GB groove implies an aggravation of grain boundary penetration by liquid phase. |
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