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

0534784 - ÚFM 2021 RIV US eng J - Journal Article
Fintová, Stanislava - Kuběna, Ivo - Luptáková, Natália - Jarý, Milan - Šmíd, Miroslav - Stratil, Luděk - Šiška, Filip - Svoboda, Jiří
Development of advanced Fe–Al–O ODS alloy
microstructure and properties due to heat treatment.
Journal of Materials Research. Roč. 35, č. 20 (2020), s. 2789-2797. ISSN 0884-2914. E-ISSN 2044-5326
R&D Projects: GA MŠMT(CZ) LQ1601
Institutional support: RVO:68081723
Keywords : microstructure * mechanical alloying * scanning electron microscopy (SEM)
OECD category: Materials engineering
Impact factor: 3.089, year: 2020
Method of publishing: Limited access
https://www.cambridge.org/core/journals/journal-of-materials-research/article/abs/development-of-advanced-fealo-ods-alloy-microstructure-and-properties-due-to-heat-treatment/A3DE7A6CED71C31F834E96316FFAA7B9

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.
Permanent Link: http://hdl.handle.net/11104/0312952