(北京航空材料研究所第四研究室，北京100095)
摘 要: 針對(duì)Ni-Al-Hf三元系，尋找出形成Ni7Hf2/Ni3Al共晶成分的合金，結(jié)合光學(xué)金相、透射電鏡、X射線衍射、電子探針等技術(shù)，研究了這種合金的相結(jié)構(gòu)、形態(tài)和組成，分析了γ/ Ni7Hf2共晶的界面熱穩(wěn)定性，并提出了降低Al含量，從而消除枝晶間有害相β-NiAl/Ni7Hf2共晶的方法。
關(guān)鍵字: 自生復(fù)合材料 Ni7Hf2相 共晶合金
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
