Produção Nacional
Revisado por pares
Experimental evaluation of the Nb Si Ti system from as-cast alloys
2016; Elsevier BV; Volume: 82; Linguagem: Inglês
10.1016/j.intermet.2016.04.006
ISSN1879-0216
AutoresJoão Carlos Jânio Gigolotti, Gilberto Carvalho Coelho, Carlos Ângelo Nunes, Paulo Atsushi Suzuki, Jean‐Marc Joubert,
Tópico(s)Solidification and crystal growth phenomena
ResumoMetal–silicon alloys have been extensively studied due to their potential as high temperature structural materials. In this sense, information from accurate phase diagram becomes important. The niobium–silicon–titanium system has been studied experimentally and thermodynamically assessed by different authors, resulting in contradictory isothermal sections and liquidus projections. This work presents results of detailed microstructural characterization of as-cast niobium–silicon–titanium alloys to assess the liquid composition associated to the invariant reactions and of equilibrated samples to determine the 1200 °C isothermal section. Important discrepancies were found between the data obtained in this work and the previous studies of the niobium–silicon–titanium system liquidus projection, especially in the intermediate region. A good agreement between our results and the calculated and experimental isothermal sections proposed in the literature is observed. However, compositional changes are suggested for the location of the observed three-phase equilibria fields.
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