The liquidus surface of the Ti-Fe-Mn system was determined by melting point determination, microscopic observation and Micro-Vickers hardness measurement. Summing up the present experimental results, the liquidus surface diagram as shown in Fig. 2 was obtained. In the figure, AE
1EE
2 represents a field of the primary separation of Ti and those of TiMn, TiFe and Ti(Fe, Mn)
2 are respectively shown by E
1EPP
1 E
2EPP
2 and BP
1PP
2CE
3F. The Ti(Fe, Mn)
2 phase is a continuous solid solution which exists in the wide range of composition between TiFe
2 phase in the Ti-Fe binary system and TiMn
2 phase in the Ti-Mn binary system. In this ternary system, two invariant reactions & liquid+Ti(Fe,Mn)_2 \
ightleftharpoonsTiFe+TiMn at about 1,100°,
& liquid \
ightleftharpoonsTi+TiFe+TiMn at about 1,050°are considered to exist.
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