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The phase stability and microstructures of Nb ss /Nb 5 Si 3 based in situ composites alloyed with Hf and Sn have been investigated. The Nb 5 Si 3 silicide in the β and γ forms was the primary phase in the Nb–24Ti–18Si–5Cr–5Al–5Hf–2Mo and Nb–24Ti–18Si–5Cr–5Al–5Hf–5Sn–2Mo alloys studied in this work. In the as cast alloys, the formation of the Nb 3 Si...
The full understanding of the Nb–Si–Cr ternary system is important for the development of Nb silicide based composites, which show great potential for high temperature applications. There was, however, disparity in experimental observations of phase equilibrium in the vicinity of the Nb-corner. Two kinds of three-phase equilibrium, Nb ss +C14+αNb 5 Si 3 and Nb ss +CrNbSi+αNb...
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