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

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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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Authors and Affiliations

  1. Materials Science Laboratory, Institute of Nuclear Science, “Vinča”, P.O. Box 522, 11001, Belgrade, Macedonia

    D. Božić, N. Ilić, M. Mitkov & M. T. Jovanović

  2. Institute of Technical Science of the Serbian Academy of Science and Arts, Knez Mihailova 35, 11000, Belgrade, Macedonia

    M. Zdujić

Authors
  1. D. Božić
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  2. N. Ilić
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  3. M. Mitkov
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  4. M. T. Jovanović
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  5. M. Zdujić
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Božić, D., Ilić, N., Mitkov, M. et al. A comparative study of microstructure, mechanical and fracture properties of Ni3Al-based intermetallics produced by powder metallurgy and standard melting and casting processes. JOURNAL OF MATERIALS SCIENCE 31, 3213–3221 (1996). https://doi.org/10.1007/BF00354671

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  • DOI: https://doi.org/10.1007/BF00354671

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