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Metallurgical Transactions A

, Volume 14, Issue 10, pp 1951–1956 | Cite as

Microstructural development in complex nickel-aluminum bronzes

  • A. Jahanafrooz
  • F. Hasan
  • G. W. Lorimer
  • N. Ridley
Alloy Phases and Structure

Abstract

The development of microstructure in complex nickel-aluminum bronzes of nominal composition Cu-10 wt pet Al-5 wt pct Ni-5 wt pct Fe, during continuous cooling from temperatures approaching the solidus, has been investigated using optical and electron microscopic techniques. At high temperatures the alloy consists of bccβ phase, and as the temperature is lowered the fcc copper-rich α phase is precipitated with a Widmanstätten morphology. As the temperature continues to decrease, Fe3Al precipitates form in theβ phase and this is followed by the formation of Fe3Al precipitates in the a phase. On further cooling theβ phase decomposes eutectoidally into ga+ NiAl; the eutectoid reaction initiates at thea/β interface and grows into theβ regions. Under normal cooling conditions the decomposition ofβ into α+ NiAl does not reach completion and the remnantβ phase transforms to martensite.

Keywords

Martensite Metallurgical Transaction Microstructural Development Continuous Cool High Iron Content 
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 1983

Authors and Affiliations

  • A. Jahanafrooz
    • 1
  • F. Hasan
    • 1
  • G. W. Lorimer
    • 1
  • N. Ridley
    • 1
  1. 1.Department of Metallurgy and Materials ScienceUniversity of Manchester/UMISTManchesterEngland

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