The 600 °C and 450 °C isothermal sections of the Zn–Fe–B system

• The 600°C and 450°C isothermal sections of the Zn-Fe-B system are determined.
• The solubility of Zn in Fe2B and FeB at 600°C is 1.8 at.% and 2.5 at.%, respectively.
• The solubility of Zn in Fe2B and FeB at 450°C is 1.7 at.% and 2.1 at.%, respectively.
• All Fe-Zn compounds can be in equilibrium with Fe2B at 450°C.
• Both FeB and Fe2B are in equilibrium with the liquid phase at 600°C.

The isothermal sections of Zn–Fe–B ternary system at 600 °C and 450 °C have been determined experimentally using scanning electron microscopy, electron probe microanalysis and X-ray diffraction. Five three-phase regions exist in the isothermal section at 600 °C, seven three-phase regions exist at 450 °C. The experimental results indicate that B is almost insoluble in Fe–Zn compounds and α-Fe. The solubility of Zn in Fe2B and FeB at 600 °C is 1.8 at.% and 2.5 at.%, respectively, and that at 450 °C is 1.7 at.% and 2.1 at.%, respectively. All Fe–Zn compounds can be in equilibrium with Fe2B, the equilibrium between FeB and ζ prohibits the coexistence of Fe2B and liquid at 450 °C. Both FeB and Fe2B are in equilibrium with the liquid phase at 600 °C.