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Characterization of microstructures, mechanical properties, and oxidation behavior of coherent A2 + L21 Fe-Al-Ti

Published online by Cambridge University Press:  31 January 2011

Ronny Krein ,
Martin Palm  and
Martin Heilmaier
Ronny Krein*
Affiliation:
Max-Planck-Institut für Eisenforschung GmbH, D-40237 Düsseldorf, Germany
Martin Palm*
Affiliation:
Max-Planck-Institut für Eisenforschung GmbH, D-40237 Düsseldorf, Germany
Martin Heilmaier
Affiliation:
Institute for Materials and Joining Technology, Otto-von-Guericke University Magdeburg, D-39104 Magdeburg, Germany
*
a) Address all correspondence to this author. e-mail: palm@mpie.de
b) Currently with Salzgitter Mannesmann Forschung GmbH, D-47259 Duisburg, Germany.
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Abstract

Two Fe-Al-Ti alloys with coherent αFe,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.

Keywords

AlFeTi
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 11 , November 2009 , pp. 3412 - 3421
Copyright
Copyright © Materials Research Society 2009

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