Titanium-Nitrogen (Ti-N) Phase Diagram
Figure 1 shows the equilibrium titanium-nitrogen phase diagrams calculated with Thermo-Calc coupled with SSOL4 thermodynamic database. The pressure of 101325 Pa was assumed.
Figure 1. Ti-N phase diagram shows which phases are to be expected at equilibrium for different combinations of nitrogen content (expressed in weight %) and temperature. The Ti-N phase diagram was calculated with Thermo-Calc coupled with SSOL4 thermodynamic database.
Nitrogen stabilizes the alpha phase (αTi) to higher temperature and is therefore referred to as alpha stabilizer. Other alpha stabilizers are aluminum, oxygen, carbon, gallium, germanium, lanthanum, and cerium.
The equilibrium solid phases of the titanium-nitrogen system are:
• the terminal hexagonal close-packed (HCP) solid solution (αTi), based on titanium below 882 °C, with a wide range of compositions;
• the terminal body-centered cubic (BCC) solid solution (βTi), based on titanium above 882 °C, also with a wide range of compositions;
• the tetragonal Ti2N phase (also referred to as the ε phase ); and
• the face-centered cubic (FCC) TiN phase (also referred to as the δ phase), with a wide range of compositions.
According to SSOL4 thermodynamic database, the titanium-rich section of the Ti-N binary system has
• one peritectoid equilibrium: (αTi) + TiN + Ti2N at 1083 °C and
• two peritectic equilibria: Liquid + (αTi) + (βTi) at 1995 °C and Liquid + (αTi) + TiN at 2345 °C.
• Titanium-Nitrogen Phase Diagram expressed in wt. % and °C
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