文章编号：(1996)04-161-5
Ni7Hf2/Ni3Al共晶的微观组织特征①
(北京航空材料研究所第四研究室，北京100095)
摘 要: 针对Ni-Al-Hf三元系，寻找出形成Ni7Hf2/Ni3Al共晶成分的合金，结合光学金相、透射电镜、X射线衍射、电子探针等技术，研究了这种合金的相结构、形态和组成，分析了γ/ Ni7Hf2共晶的界面热稳定性，并提出了降低Al含量，从而消除枝晶间有害相β-NiAl/Ni7Hf2共晶的方法。
关键字: 自生复合材料 Ni7Hf2相 共晶合金
MICROSTRUCTURAL CHARACTERIZATION OF
Ni7Hf2/Ni3Al EUTECTIC ALLOY
Ni7Hf2/Ni3Al EUTECTIC ALLOY
（Institute of Aeronautical Materials, Beijing100095）
Abstract:The microstructural characterizations of Ni7Hf2/Ni3Al eutectic in a Ni6-Al32-Hf ternary alloy have been examined by TEM, SEM, electron microprobe and X-ray diffraction. The formation of harmful phases existing in the eutectic with Ni7Hf2together was explained in terms of the segregation of Al in the interdentrites. The interface thermal stability ofγ′/Ni7Hf2andβ-NiAl/Ni7Hf2was also discussed.
Key words: in-situcomposite material eutectic alloy Ni7Hf2phase
