航空学报 > 1997, Vol. 18 Issue (4): 439-443

Al 量对 Ni-Al-Hf-Cr-W 系合金显微组织结构的影响

马书伟, 郑运荣, 于熙泓   

  1. 北京航空材料研究院第四研究室
  • 收稿日期:1996-08-27 修回日期:1996-11-15 出版日期:1997-08-25 发布日期:1997-08-25

EFFECT OF Al CONTENT ON MICROSTRUCTURE OF Ni Al Hf Cr W SYSTEM ALLOYS

Ma Shuwei, Zheng Yunrong, Yu Xihong   

  1. Beijing Institute of Aeronautical Materials,Beijing,100095
  • Received:1996-08-27 Revised:1996-11-15 Online:1997-08-25 Published:1997-08-25

摘要:

研究了Ni-20Hf-8Cr-8W-(4~6)Al系列合金的显微组织以及Al含量对共晶组织的影响,结果表明:此系列合金中,随着Al含量的微小变化,会析出不同的共晶组织;当Al含量大于5.5wt%时,出现(β-NiAl+Ni7Hf2)或(γ′+β-NiAl+Ni7Hf2)共晶:当Al量小于5.5wt%时,会出现(γ′+Ni7Hf2)、(γ+γ′+Ni7Hf2)或(γ+Ni7Hf2)共晶组织。并且得出(Ni-20Hf-8Cr-8W-5.3Al)wt%的合金具有(γ′+Ni7Hf2)共晶,适宜选做为以Ni7Hf2增强的共晶复合材料的合金成份。

关键词: Ni-Al-Hf-Cr-W合金, 共晶复合材料, Ni7Hf2相, 共晶, 微观结构

Abstract:

The microstructural characterizations of Ni (4~6)Al 20Hf 8Cr 8W system alloys have been examined by optical micrograph,TEM,SEM,Electron Microprobe and X ray diffraction. In particular, the influence of aluminium content was studied in detail. A slight difference of the aluminum content can change obviously the microstructure and bring about eutectic phases. The γ′+Ni 7Hf 2,γ+γ′+Ni 7Hf 2 or γ+Ni 7Hf 2 eutectic was present in low Al content alloys(<5.5wt%) ,and the β+Ni 7Hf 2 or γ+β NiAl+Ni 7Hf 2 eutectic in high content alloys(>5.5 wt%) . Ni 5.3Al 20Hf 8Cr 8W is the proper composition as the γ′/Ni 7Hf 2 eutectic composite materials.

Key words: Ni Al Hf Cr W alloys, in situ composite material, Ni 7Hf 2phase, eutectic, microstructure

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