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

Table 9. Invariant reactions of the Fe-Lu binary system
Reactions Reaction type Temperature (K) Composition () Reference
L + bcc(δ-Fe) ↔ fcc(γ-Fe) Peritectic 1667.0 [88] (exp.)
1667.0 [90] (cal.)
1667.5 0.070 This work (cal.)
Fe Lu + fcc(γ-Fe) ↔ bcc(α-Fe) Peritectoid 1185.0 [88] (exp.)
17 2
1185.0 [90] (cal.)
1184.8 This work (cal.)
L + fcc(γ-Fe) ↔ Fe Lu 2 Peritectic 1593.0 0.130 [88] (exp.)
17
1593.0 0.090 [90] (cal.)
1602.0 0.111 [19] (cal.)
1590.1 0.105 This work(cal.)
L ↔ Fe Lu + Fe Lu Eutectic 1548.0 0.180 [88] (exp.)
17 2 23 6
1549.0 0.158 [90] (cal.)
1546.0 0.172 [19] (cal.)
1559.9 0.184 This work (cal.)
L + Fe Lu ↔ Fe Lu Peritectic 1563.0 0.196 [88] (exp.)
3 23 6
1560.0 0.183 [90] (cal.)
1560.0 0.202 [19] (cal.)
1560.9 0.188 This work (cal.)
L + Fe Lu ↔ Fe Lu Peritectic 1583.0 0.225 [88] (exp.)
2
3
1581.0 0.229 [90] (cal.)
1580.0 0.333 [19] (cal.)
1580.4 0.241 This work (cal.)
L ↔ Fe Lu Congruent 1618.0 0.333 [88] (exp.)
2
1618.0 0.333 [90] (cal.)
1620.0 0.333 [19] (cal.)
1619.6 0.333 This work (cal.)
L ↔ Fe Lu + hcp-Lu Eutectic 1243.0 0.750 [88] (exp.)
2
1237.0 0.741 [90] (cal.)
1249.0 0.670 [19] (cal.)
1240.3 0.642 This work(cal.)

Figure 1. Calculated Fe-Tb binary phase diagram with (A) the calculations [104] and (B) the experimental data [92,93,95] .

[44]
formation of Fe RE in the Fe-RE binary systems by the authors is all less negative. Further experiments
2
are still needed to determine the enthalpy of formation of the Fe-Lu intermetallic compounds.