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Metallurgical Transactions A

, Volume 13, Issue 8, pp 1337–1345 | Cite as

The morphology, crystallography, and chemistry of phases in as-cast nickel-aluminum bronze

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

Abstract

The morphology, crystallography, and composition of the phases present in as-cast nickel-aluminum bronze of nominal composition copper-10 wt pct aluminum-5 wt pct nickel-5 wt pct iron have been investigated using optical, electron optical, and microprobe analysis techniques. The as-cast microstructure consists of copper-rich α, martensitic β, and κ-phases based on Fe3Al and NiAl. The κz precipitates have a dendritic morphology and are cored; the composition ranges from iron-rich solid solution to Fe3Al. The κII and κiv precipitates have, respectively, a dendritic and an equiaxed/dendritic morphology, and are based on Fe3Al, while κIII is a eutectoidal decomposition product of lamellar or globular morphology based on NiAl. The κI, κII, and κIII precipitates have the Kurdjumov-Sachs orientation relationship with α matrix. Small κIV precipitates exhibit the Nishiyama-Wasserman orientation relationship with the α matrix, while large κiv precipitates have an orientation relationship which lies between Kurdjumov-Sachs and Nishiyama-Wasserman.

Keywords

Martensite Metallurgical Transaction Orientation Relationship Electron Diffraction Pattern Thin Specimen 
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

© American Society for Metals and The Metallurgical Society of AIME 1982

Authors and Affiliations

  • F. Hasan
    • 1
  • A. Jahanafrooz
    • 1
  • G. W. Lorimer
    • 1
  • N. Ridley
    • 1
  1. 1.Department of MetallurgyJoint University of Manchester/UMISTManchesterEngland

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