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定向凝固Ni-Ni3Si共晶的晶体学择优取向研究
Study on the Preferential Orientation of the Directionally Solidified Ni-Ni3Si Eutectic in Situ Composite

DOI: 10.12677/CMP.2014.33005, PP. 33-38

Keywords: 定向凝固，共晶自生复合材料，透射电镜，择优取向
Directional Solidification, Eutectic in Situ Composite, Transmission Electron Microscopy, Preferential Orientation

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Abstract:

Ni-Ni3Si共晶自生复合材料是一种具有良好的应用前景的高温结构材料。布里奇曼定向凝固技术是制备Ni-Ni3Si共晶复合材料的先进技术之一。在定向凝固过程中，共晶两相长大方向在某一晶体学方向上是优先的，这种择优取向是由系统自动减小其总界面能所致。本文采用透射电镜研究了定向凝固技术制备的Ni-Ni3Si共晶自生复合材料的显微组织结构和晶体学最优生长方向。研究表明Ni-Ni3Si共晶是具有层片组织的规则共晶组织，规则排列的Ni3Si化合物均匀分布在Ni基体上。其晶体学择优方向[110]Ni//[211] Ni3Si, ( 113)Ni//(113)Ni3Si。
The Ni-Ni3Si eutectic in situ composite is a kind of promising high-temperature structural material. Bridgman directional solidification technique is one of the advanced techniques to prepare this material. During directional solidification process, two phases of the eutectic in situ composite grow faster in certain direction. This is caused by the automatic decrease of the total interface energy. In this paper microstructure and preferential orientation of the Ni-Ni3Si eutectic in situ composite are studied by the transmission electron microscopy (TEM). It is found that the Ni-Ni3Si eutectic in situ composite is a kind of regular lamellar eutectic, and the Ni3Si intermetallic is uniformly distributed in the Ni matrix. The preferential orientation of the Ni-Ni3Si eutectic in situ composite prepared by Bridgman directional solidification technique is [110]Ni//[211]Ni3Si, ( 113)Ni//(113)Ni3Si.

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