Abstract
In the present work, the Nb–B binary system was thermodynamically optimized. The stable phases in this system are BCC (niobium), Nb 3B 2, NbB, Nb 3B 4, Nb 5B 6, NbB 2, B (boron) and liquid L. The borides Nb 3B 2, NbB, Nb 3B 4 and Nb 5B 6 and the B (boron) were modeled as stoichiometric phases and the liquid L, BCC (niobium) and NbB 2 as solutions, using the sublattices model, with their excess terms described by the Redlich–Kister polynomials. The Gibbs energy coefficients were optimized based on the experimental values of enthalpy of formation, low temperature specific heat, liquidus temperatures and temperatures of invariant transformations. The calculated Nb–B diagram reproduces well the experimental values from the literature.
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