Solid state reactions induced by mechanical alloying in metal-silicon (metal = Mo, Nb) systems

L. Liu, F. Padella, W. Guo, M. Magini

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Stoichiometric Mo33Si66and Nb33Si66have been alloyed by mechanical alloying (MA) from the elemental powders and the process has been monitored by X-ray diffraction (XRD) technique. Nanocrystalline intermetallic compounds were obtained for either compositions: the NbSi system gave the expected NbSi2compound, while in the MoSi system both αMoSi2(low temperature phase) and βMoSi2(high temperature phase) with the latter being the dominant phase, were promoted by the milling action. The metastable equilibrium αMoSi2↔βMoSi2, as well as the tendency to reaction of prealloyed MoSi samples, have been examined by means of differential thermal analysis (DTA), followed by X-ray identification of the formed phases. Finally, the oxygen influence on phase transformation induced by both milling action and thermal treatment has been examined. It has been found that oxygen pick-up not only strongly inhibited the solid state reactions in the process of mechanical alloying but also caused the destabilization of the already formed intermetallic compounds. © 1995.
Original languageEnglish
Pages (from-to)3755 - 3761
Number of pages7
JournalActa Metallurgica et Materialia
Issue number10
Publication statusPublished - 1995
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Engineering(all)

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