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Development of advanced Fe–Al–O ODS alloy microstructure and properties due to heat treatment

Published online by Cambridge University Press:  28 October 2020

Stanislava Fintová ,
Ivo Kuběna ,
Natália Luptáková ,
Milan Jarý ,
Miroslav Šmíd ,
Luděk Stratil ,
Filip Šiška Open the ORCID record for Filip Šiška [Opens in a new window]  and
Jiří Svoboda
Stanislava Fintová*
Affiliation:
CEITEC IPM, Institute of Physics of Materials, The Czech Academy of Sciences, CZ-61662Brno, Czech Republic
Ivo Kuběna
Affiliation:
CEITEC IPM, Institute of Physics of Materials, The Czech Academy of Sciences, CZ-61662Brno, Czech Republic
Natália Luptáková
Affiliation:
CEITEC IPM, Institute of Physics of Materials, The Czech Academy of Sciences, CZ-61662Brno, Czech Republic
Milan Jarý
Affiliation:
CEITEC IPM, Institute of Physics of Materials, The Czech Academy of Sciences, CZ-61662Brno, Czech Republic
Miroslav Šmíd
Affiliation:
CEITEC IPM, Institute of Physics of Materials, The Czech Academy of Sciences, CZ-61662Brno, Czech Republic
Luděk Stratil
Affiliation:
CEITEC IPM, Institute of Physics of Materials, The Czech Academy of Sciences, CZ-61662Brno, Czech Republic
Filip Šiška
Affiliation:
CEITEC IPM, Institute of Physics of Materials, The Czech Academy of Sciences, CZ-61662Brno, Czech Republic
Jiří Svoboda
Affiliation:
CEITEC IPM, Institute of Physics of Materials, The Czech Academy of Sciences, CZ-61662Brno, Czech Republic
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Fe–Al–O ODS alloy prepared via mechanical alloying was subjected to three different heat treatments. Material basic state exhibited a fine-grained (300–500 nm) microstructure with fine dispersion of aluminum oxide particles (60% up to 20 nm). Heat treatment at 1100 °C for 3 h resulted in local grain and particles coarsening. Prolongation of the heat treatment to 24 h resulted in further grain (50 % up to 5 μm) and particle (25 % with size 25–40 nm) coarsening. Annealing at 1200 °C for 24 h led to a bimodal microstructure (35 % of grains with size 100–250 μm and 45 % of particles with size 30–60 nm) and substantial oxide particle coarsening. Microstructural changes resulted in tensile strength decrease and ductility increase. Tensile tests at 800 °C revealed a 90% decrease of tensile strength while ductility increased 4–6 times when compared to the room temperature tests. The hardening ratio was below 10 % for all the alloys and both test temperatures.

Keywords

microstructuremechanical alloyingscanning electron microscopy (SEM)
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 20 , 28 October 2020 , pp. 2789 - 2797
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Copyright
Copyright © The Author(s), 2020, published on behalf of Materials Research Society by Cambridge University Press

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