Journal of Materials Science

, Volume 31, Issue 12, pp 3213–3221 | Cite as

A comparative study of microstructure, mechanical and fracture properties of Ni3Al-based intermetallics produced by powder metallurgy and standard melting and casting processes

  • D. Božić
  • N. Ilić
  • M. Mitkov
  • M. T. Jovanović
  • M. Zdujić
Article

Abstract

A comparative study of the microstructure, mechanical properties and fractography of Ni3Al macro- and microalloyed intermetallics produced by powder metallurgy (PM) and standard vacuum melting and casting processes has been carried out. Non-porous PM compacts were obtained by vacuum hot pressing of powders produced either by gas atomization or by a rotating electrode process. All materials showed a positive temperature dependence of the compression yield strength. The maximum strength was attained between 600 and 700 °C, then the decrease occurs. With increase in temperature the ductility of all materials slightly decreased to a minimum and then abruptly increased. Values of mechanical properties of PM compacts were higher than those of as-cast material. There is a correlation between the fracture morphology and the ductility of Ni3Al, i.e. the higher ductility corresponds to transgranular fracture, while the minimum ductility is a consequence of intergranular fracture.

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Copyright information

© Chapman & Hall 1996

Authors and Affiliations

  • D. Božić
    • 1
  • N. Ilić
    • 1
  • M. Mitkov
    • 1
  • M. T. Jovanović
    • 1
  • M. Zdujić
    • 2
  1. 1.Materials Science LaboratoryInstitute of Nuclear Science, “Vinča”BelgradeYugoslavia
  2. 2.Institute of Technical Science of the Serbian Academy of Science and ArtsBelgradeYugoslavia

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