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The Fe-A1-Ti system

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Journal of Phase Equilibria

Abstract

An extensive experimental investigation of the Fe-Al-Ti system by metallography, microprobe analysis, and XRD on quenched specimens and on diffusion couples is presented. Two isothermal sections at 800 and 1000 °C were established; they differ substantially from the existing (800 °C) or partly determined (1000 °C) diagrams. From these results, existence of the τ1 phase (Fe2AlTi) can be ruled out. Existence of the ternary compounds, τ2 (Al2FeTi) and τ3 (Al22Fe3Ti8), is confirmed. The composition limits of both phases were determined; they differ considerably from those given in earlier reports. The τ2 phase apparently exists in a cubic and a tetragonal polymorph, depending on composition. The cubic form exists at high titanium contents. At 1000 °C, the two polymorphs are separated by a miscibility gap. At compositions where the “X phase” (Al69Fe25Ti6) was previously reported, single-phase samples were obtained at both temperatures. From the present results, there is no evidence to assume that this is a new ternary phase rather than the ternary homogeneity range of the Al3Fe phase. In addition, extensions of the binary intermetallic phases into the ternary system were determined.

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Authors and Affiliations

  1. Max-Planck-Institut für Eisenforschung Düsseldorf, Germany

    M. Palm & G. Inden

  2. Laboratoire de Thermodynamique et de Physico-Chimie Métallurgiques - E.N.S.E.E.G. Saint Martin d’Héres, France

    N. Thomas

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  1. M. Palm
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  2. G. Inden
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  3. N. Thomas
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Palm, M., Inden, G. & Thomas, N. The Fe-A1-Ti system. JPE 16, 209–222 (1995). https://doi.org/10.1007/BF02667305

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