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Characterization of microstructures, mechanical properties, and oxidation behavior of coherent A2 + L21 F−Al−Ti

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Abstract

Two Fe-Al-Ti alloys with coherent aFe,Al (A2) + Fe2AlTi (L21) microstructures have been produced and the evolution of the microstructure with aging time has been studied by light optical and scanning electron microscopy and hardness measurements. The compressive flow strength, creep properties, brittle-to-ductile-transition temperatures (BDTT), and oxidation behavior of the alloys have been evaluated. The results show that the investigated alloys show good flow strength, high creep resistance, and good oxidation resistance. However, their BDDT is high compared to binary Fe-Al-based alloys and compared to other Fe-Al-Ti alloys no increase in creep resistance was achieved by generating coherent microstructures. The latter effect is due to the breakup of the coherent microstructures when the temperature varies because the compositions and consequently the volume fractions of the phases vary markedly depending on temperature.

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Author notes

  1. Martin Palm

    Present address: Max-Planck-Institut für Eisenforschung GmbH, D-40237, Düsseldorf, Germany

  2. Ronny Krein

    Present address: Salzgitter Mannesmann Forschung GmbH, D-47259, Duisburg, Germany

Authors and Affiliations

  1. Max-Planck-Institut für Eisenforschung GmbH, D-40237, Düsseldorf, Germany

    Ronny Krein

  2. Institute for Materials and Joining Technology, Otto-von-Guericke University Magdeburg, D-39104, Magdeburg, Germany

    Martin Heilmaier

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  1. Ronny Krein
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Krein, R., Palm, M. & Heilmaier, M. Characterization of microstructures, mechanical properties, and oxidation behavior of coherent A2 + L21 F−Al−Ti. Journal of Materials Research 24, 3412–3421 (2009). https://doi.org/10.1557/jmr.2009.0403

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