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Phase Equilibria between γ-Fe (A1) and Fe2Ti Laves (C14) Phases and Microstructure in Fe-Ti-Ni Ternary System at Elevated Temperatures

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Abstract:

The phase equilibria among α-Fe, γ-Fe and Fe2Ti phases in Fe-Ti-Ni ternary system at 1473 K and 1373 K with Ni (γ former element) addition were examined, by paying attention to the γ+Fe2Ti two-phase region. The Fe2Ti single-phase region extends toward the equal-titanium concentration direction up to about 30 at% Ni, and the Laves phase becomes in equilibrium with γ-Fe by 12 at% Ni addition, but the γ+Fe2Ti two-phase region is limited because of the formation of liquid phase by further Ni addition at 1473 K. With decreasing temperature, a ternary eutectic reaction (L→γ-Fe+Fe2Ti+Ni3Ti) occurs, making the two-phase region wider just below the invariant reaction at 1373 K, and the region becomes narrower again by the enlargement of the three-phases region toward Fe-rich side.

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Info:

Periodical:

Materials Science Forum (Volumes 561-565)

Pages:

435-438

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.561-565.435

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Online since:

October 2007

Authors:

Tomoaki Sugiura, Shigehiro Ishikawa, Takashi Matsuo, Masao Takeyama

Keywords:

Intermetallic, Lattice Parameter, Laves Phases, Phase Equilibria

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