| Full text | |
| Author(s): |
Peçanha‚ R.M.
;
Ferreira‚ F.
;
Coelho‚ G.C.
;
Nunes‚ C.A.
;
Sundman‚ B.
Total Authors: 5
|
| Document type: | Journal article |
| Source: | INTERMETALLICS; v. 15, n. 8, p. 999-1005, 2007. |
| Abstract | |
In the present work, the Nb-B binary system was thermodynamically optimized. The stable phases in this system are BCC (niobium), Nb3B2, NbB, Nb3B4, Nb5B6, NbB2, B (boron) and liquid L. The borides Nb3B2, NbB, Nb3B4 and Nb5B6 and the B (boron) were modeled as stoichiometric phases and the liquid L, BCC (niobium) and NbB2 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. (C) 2006 Elsevier Ltd. All rights reserved. (AU) | |
| FAPESP's process: | 00/08062-5 - Bo Sundman | Royal Institute of Technology - Suécia |
| Grantee: | Gilberto Carvalho Coelho |
| Support Opportunities: | Research Grants - Visiting Researcher Grant - International |