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Metallurgical Transactions A

, Volume 16, Issue 10, pp 1849–1862 | Cite as

The influence of cobalt, tantalum, and tungsten on the microstructure of single crystal nickel-base superalloys

  • M. V. Nathal
  • L. J. Ebert
Mechanical Behaviour

Abstract

The influence of composition on the microstructure of single crystal nickel-base superalloys was investigated. Co was replaced by Ni, and Ta was replaced by either Ni or W, according to a matrix of compositions based on MAR-M247. Substitution of Ni for Co caused an increase inγ′ solvus temperature, an increase inγ-γ′ lattice mismatch, and the precipitation of W-rich phases in the alloys with high refractory metal levels. Substitution of Ni for Ta caused large decreases inγ′ solvus temperature,γ′ volume fraction, andγ-γ′ lattice mismatch, whereas substitution of W for Ta resulted in smaller decreases in these features. For the alloys withγ′ particles that remained coherent, substitution of Ni for Co caused an increase inγ′ coarsening rate. The two alloys with the largest magnitude of lattice mismatch possessedγ′ particles which lost coherency during unstressed aging and exhibited anomalously low coarsening rates. Creep exposure at 1000 °C resulted in the formation ofγ′ lamellae oriented perpendicular to the applied stress axis in all alloys.

Keywords

Metallurgical Transaction Lattice Mismatch Misfit Dislocation Single Crystal Alloy NASA Lewis Research 
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

© The Metallurgical of Society of AIME 1985

Authors and Affiliations

  • M. V. Nathal
    • 1
  • L. J. Ebert
    • 2
  1. 1.NASA Lewis Research CenterCleveland
  2. 2.Case Western Reserve UniversityCleveland

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