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Experimental Study of the Cr-Hf-Nb System: Liquidus Projection and 1200 °C Isothermal Section

2020; Springer Science+Business Media; Volume: 41; Issue: 5 Linguagem: Inglês

10.1007/s11669-020-00838-w

1863-7345

João Carlos Jânio Gigolotti, Antonio Augusto Araújo Pinto da Silva, Gilberto Carvalho Coelho, Carlos Ângelo Nunes, Jean‐Marc Joubert,

Advanced materials and composites

Phase equilibria data from ternary Cr-Nb-X (X = Hf, Ta, Ti, Zr) systems are relevant to the development of Niobium-silicide based composites for use in jet engines. Such systems present at several temperatures a pseudo-binary of Cr2Nb-Cr2X Laves phases. This work presents the experimentally determined liquidus projection and the 1200 °C isothermal section for the Cr-Hf-Nb system based on microstructural characterization of as-cast and heat-treated alloys. The microstructural characterization using x-ray diffractometry, scanning electron microscopy and electron probe microanalysis showed four eutectic-type monovariant reactions and two class II invariant reactions in the liquidus projection. The 1200 °C isothermal section showed complete solubility between Nb and Hf in (C15) phase and one three phase equilibria field.