一方向凝固した Fe-Fe_2Ti 系共晶合金の組織的および磁気的特性

概要

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Structures and magnetic properties of Fe-Fe_2Ti eutectic alloys containing 11, 16 and 18 wt%Ti respectively and those of unidirectionally solidified Fe-16 wt%Ti alloy have been investigated. As the result of magnetic analysis, Fe-Fe_2Ti eutectic alloys consists of two ferromagnetic α-Fe and Fe_<2+x>Ti_<1-x> phases (λ>0). The Curie temperature of the former is 780℃ and that of the latter is around 100∿135℃, depending on Ti content in alloys and heat treatment condition. It seems that the Ti content of Fe_<2+x>Ti_<1-x> in Fe-Fe_<2+x>Ti_<1-x> eutectic alloys, annealed at 1000℃ for 1 hour, is around 29 at% by magnetic measurement. The structure of unidirectionally solidified Fe-16 wt%Ti alloy has the lamellar or rod-like Fe_<2+x>Ti_<1-x> phase in matrix of α-Fe phase. The results of metallography, X-ray diffraction and powder patterns indicate that a great part of <0001> of Fe_<2+x>Ti_<1-x> phase and <100> of α-Fe phase are parallel to the crystal growth direction on the crystallographic orientations of both phases. Similarly, the magnetic properties of unidirectionally solidified alloy show anisotropy depending on solidification rates. The magnetic anisotropy for this unidirectionally solidified eutectic alloy may be mainly caused by crystal anisotropy of Fe_<2+x>Ti_<1-x> phase and shape anisotropy of α-Fe phase by magnetic torque measurement up to 285℃.
社団法人日本鉄鋼協会の論文
1974-03-01