Common Phases for Niobium Materials

The following lists common phase names and the corresponding Thermo‑Calc database phase names for some key niobium materials.

Name in the Database	Common Name and Description
LIQUID	Liquid phase, which covers the melt of Nb alloys
BCC_B2	BCC type solid solution phase (β), which is the matrix phase for Nb alloys. The ordered B2 phase with the disordered BCC_A2 has been modeled with the so-called partition model. It is always labeled as BCC_B2 in calculations with this database. It is necessary to check the constitution of the phase to find out whether it is ordered or not.
C14_Laves	Laves_C14 phase, which covers some Cr/Nb etc.-compounds.
C15_Laves	Laves_C15 phase, which covers compounds, Cr₂Nb, Cr₂Ta, Cr₂Ti etc.
FCC_A1	FCC type solid solution phase, as well as carbide, which covers HfC, NbC, TaC, ZrC etc. solution phase compositions.
M5SI3_D88	Ti-rich M₅Si₃ phase, dissolving other elements. It also covers Hf₅Si₃, Zr₅Si₃, Hf₅Si₃C, and Zr₅Si₃C compounds.
M3SI1	It covers Nb₃Si, Ti₃Si, Ta₃Si and dissolving other elements.
NB5Si3_D8M	It covers αNb₅Si₃ and Ta₅Si and dissolving other elements.
W5Si3_D8L	It covers Cr₅Si₃, Mo₅Si₃, βNb₅Si₃, V₅Si₃ and W₅Si₃ and solutions between them.