Journal of Materials Science

, Volume 31, Issue 7, pp 1681–1688 | Cite as

The influence of ageing on the stability of β-γ/γ′ derived microstructures in Ni-Al-Cr-(Co) alloys

  • W. F. Gale
  • R. V. Nemani
  • J. A. Horton


Multiphase Ni-Al-(Fe)-(Cr)-(Co)-based intermetallics with β(B2)-γ (A1)/γ′(L12), β-γ or β-γ′ microstructures can exhibit significant room-temperature tensile ductility. In the case of Ni-Al-Cr-based alloys, microstructural development is complicated by the precipitation of α-Cr, which can supplant the γ-phase during ageing of three-phase β-γ/γ′ microstructures. An investigation of the stability, during ageing, of cast Ni-Al-Cr-(Co) alloys with microstructures derived from β-γ/γ′ is reported. In the as-cast condition, the materials investigated consisted of a dendritic matrix containing L10 type martensite and interdendritic γ/γ′. Extensive intra- and interdendritic α-Cr precipitation was also observed. The stability during ageing of the interdendritic γ/γ′ microstructure is also considered and transformation of the L10 martensite is examined.


Polymer Precipitation Microstructure Martensite Ductility 
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Copyright information

© Chapman & Hall 1996

Authors and Affiliations

  • W. F. Gale
    • 1
  • R. V. Nemani
    • 1
  • J. A. Horton
    • 2
  1. 1.Materials Research and Education CenterAuburn UniversityAuburnUSA
  2. 2.Metals and Ceramics DivisionOak Ridge National LaboratoryOak RidgeUSA

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