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Ye et al. J Mater Inf 2023;3:15 https://dx.doi.org/10.20517/jmi.2023.08 Page 25 of 37

[53] [90]
Figure 16. The calculated enthalpy of mixing of liquid Fe-Lu alloys at 1,950 K with the experimental data and the calculations .

Figure 17. Calculated partial enthalpy of Fe (A) and Lu (B) in liquid Fe-Lu alloys at 1,950 K with the experimental data [53] and the
calculations [90] .

mixing of liquid Fe-La alloys is positive, while that of liquid Fe-Pr alloys is positive and negative over
different composition regions. Meanwhile, the calculated enthalpy of mixing in liquid Fe-RE (RE = Ce, Nd,
Sm, Gd, Tb, Dy, Ho, Er, Tm, Lu, and Y) alloys is all negative. The minimum enthalpy of mixing of liquid
Fe-RE (RE = Ce, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, and Lu) alloys is located in the composition range of
30 at.%-50 at.% RE. In general, the enthalpy of mixing of liquid Fe-RE (apart from Fe-Ce and Fe-Y) alloys is
calculated and displayed a tendency that the higher the RE atomic number, the more negative the enthalpy
of mixing. The similar irregularities of the enthalpy of mixing of liquid Fe-Ce and Fe-Y alloys in the Fe-RE