Niobium based silicides possess a good combination of properties like high strength at elevated temperatures, high stiffness, etc., which make them potential candidate materials for high temperature applications (>950^oC). Present paper reports our findings in the as cast as well as heat treated multi-component Nb-Ti-Si-X alloys. The four different phases, namely, the matrix β phase, the laves phase (Cr₂Nb type) and Nb- and Ti silicides have been identified in the microstructures of the alloys. A strong solute partitioning tendency among the various elements has been noticed. Silicide phases were rich with Zr, Hf, W elements whereas the matrix phase was rich in Al, Ti, Nb. Heat treating at and above 1300^oC caused the redistribution of the silicide and dissolution of laves phases whereas subsequent aging between 900^oC and 1100^oC for various duration caused reprecipitation of laves phases into various morphologies. The formation of these phases has been rationalized in terms of solute partitioning and the stability of the phases. High temperature deformation of these alloys have shown that silicide phase has undergone refinement whereas the laves phase has undergone dissolution and reprecipitation. Role of these phases in determining the mechanical properties of these alloys has also been identified.