Metallurgical and Materials Transactions A

, Volume 43, Issue 1, pp 10–19 | Cite as

Discontinuous Precipitation and Phase Stability In Re- and Ru-Containing Nickel-Base Superalloys

  • Astrid Heckl
  • Samir Cenanovic
  • Mathias Göken
  • Robert F. Singer


The phase stability of nickel-base superalloys has been investigated using a new in-house-designed alloy series with stepwise increased additions of Re and Ru at otherwise fixed atomic fractions of alloying elements. Results presented in this study are focused on the lesser-known topologically closed packed (TCP) formation of columnar colonies or so-called discontinuous precipitation. A detailed investigation of these colonies allowed for identifying compositional changes during the growth process and for providing a three-dimensional (3-D) illustration of the TCP phases within these colonies. The results were used to compare the colony growth process with existing growth models. Furthermore, the influence of Re and Ru on the appearance of discontinuous precipitation has been investigated by means of colony width and the effect on creep properties. Larson-Miller plots are given to illustrate the creep strength of directionally solidified samples with and without TCP colonies compared with single crystalline samples free from TCP colonies.


Creep Strength Reaction Front Discontinuous Precipitation Directionally Solidify Topologically Close Packed 
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This work was financially supported by the German Research Foundation (DFG) in the framework of the DFG research group (Graduiertenkolleg) 1229 “Stable and Metastable Multiphase Systems for High Temperature Applications.” We would like to thank Karl Nigge for measurements with the EPMA.


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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2011

Authors and Affiliations

  • Astrid Heckl
    • 1
  • Samir Cenanovic
    • 2
  • Mathias Göken
    • 2
  • Robert F. Singer
    • 1
  1. 1.Institute of Science and Technology of Metals, Department of Materials Science and EngineeringUniversity Erlangen-NurembergErlangenGermany
  2. 2.Institute General Materials Properties, Department of Materials Science and EngineeringUniversity Erlangen-NurembergErlangenGermany

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