J Mater Sci Technol ›› 2003, Vol. 19 ›› Issue (01): 59-62.

• Research Articles • Previous Articles     Next Articles

Microstructures and Creep Behavior of a Directionally Solidified NiAl-Fe(Nb) Multiphase Intermetallic Alloy

Yihui QI, Jianting GUO, Chuanyong CUI   

  1. Department of Superalloys, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China\noindent
  • Received:1900-01-01 Revised:1900-01-01 Online:2003-01-28 Published:2009-10-10
  • Contact: Jianting GUO

Abstract: The microstructure and creep behavior of a DS NiAl-Fe(Nb) multiphase intermetallic alloy have been investigated. This alloy exhibits dendritic structure, in which dendritic arm isβ-(Ni,Fe)(Fe,Al) phase surrounded by interdendritic region ofγ'/γ phase. The results of the creep test indicated that all of the creep curves have similar characteristic, which is a short primary creep stage and a dominant steady state creep stage, and the creep strain ranges from 18% to 52%. The apparent stress exponent and the apparent activation energy were analyzed and discussed. The mechanism of the creep deformation was also analyzed by the observation of TEM.

Key words: NiAl, Multiphase intermetallic alloy, Microstructure, Creep