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Journal of Materials Science

, Volume 27, Issue 14, pp 3869–3875 | Cite as

Role of zirconium in the phase formation at the interdendritic zone in nickel-based superalloys

  • E. Gozlan
  • M. Bamberger
  • S. F. Dirnfeld
  • B. Prinz
Papers

Abstract

A commercial Alloy 80A and a modified alloy with lower titanium and zirconium contents, e.g. 1.4% and <0.01%, respectively, were subjected to unidirectional solidification followed by a rapid quench in water to preserve the structure at elevated temperatures. The slow solidification results in a coarse dendritic structure with a high enrichment of sulphur (up to 2%), aluminium (up to 4%), titanium (up to 13%) and zirconium in the interdendritic zones. In the commercial Alloy 80A, the zirconium and sulphur present in the interdendritic zone result in a eutectic containing ZrS and NiCrTi-matrix. Excess zirconium forms an NiZr-intermetallic. No TiS is formed in this case. In the absence of zirconium, the titanium enriched in the interdendritic residual melt forms a eutectic of TiS. In both cases the effective solidus temperature corresponding to the composition of the residual melt is 1170°C, compared to 1330 °C, which is the solidus temperature of the bulk material.

Keywords

Polymer Titanium Zirconium Elevated Temperature Bulk Material 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1992

Authors and Affiliations

  • E. Gozlan
    • 1
  • M. Bamberger
    • 1
  • S. F. Dirnfeld
    • 1
  • B. Prinz
    • 2
  1. 1.Department of Materials EngineeringTechnionHaifaIsrael
  2. 2.Metallgesellschaft AGFrankfurtGermany

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