Thermodynamic description of the Cr–Nb–Si isothermal section at 1473K

Thermodynamic modelling of the Nb–Ni–Si phase diagram based on the 1073 K isothermal section using ab initio calculations

“…Some thermodynamic descriptions of the Nb-Si system are available [17][18][19][20][21][22] with a few variations regarding models for the stable phases. For the present work we adopted the assessment performed by Geng et al [22], which is an update of the description carried out by Geng et al [21], with a three-sublattice model for the H-Nb 5 Si 3 phase.…”

“…For the present work we adopted the assessment performed by Geng et al [22], which is an update of the description carried out by Geng et al [21], with a three-sublattice model for the H-Nb 5 Si 3 phase. The work of Geng et al [21], on its turn, was based on David et al [20], who had already described some of the intermediary phases as non-stoichiometric compounds. The resulting Nb-Si binary phase diagram is presented in Fig.…”

“…(8). The binary L ij fcc parameters were taken from the adopted binary assessments [15,20,25]. We also introduced a ternary excess parameter L NbNiSi fcc , as described in Section 6.1.1.…”

The effects of the dispersant on the Powder Morphology of Nb-Ti-Cr-Si Based Ultrahigh Temperature Alloy

“…However, a major barrier to their practical applications is their poor high temperature oxidation resistance [4][5][6] . In order to achieve a balance among properties of good creep strength, excellent oxidation resistance and acceptable fracture resistance, the volume fraction and the morphology of each constituent phase must be controlled reasonably.…”

“…In order to achieve a balance among properties of good creep strength, excellent oxidation resistance and acceptable fracture resistance, the volume fraction and the morphology of each constituent phase must be controlled reasonably. It was found that addition of a higher content of Cr improved the high temperature oxidation resistance due to formation of the Laves phase [4][5][6][7][8] , so the new Nb-Ti-Cr-Si based alloys have attracted ever increasing attentions. Their phase constituents are Nb solid solution (Nbss), (Nb,X)5Si3(X represents Ti,Hf and Cr elements) and Cr2Nb.…”