The Effect of Nb Addition on the Microstructure and the High-Temperature Strength of Fe3Al Aluminide

The microstructural and high-temperature mechanical properties of Fe–26Al– x Nb ( x  = 3 and 5 at. pct) are compared. The alloys were investigated “as cast” and after hot rolling at 1473 K (1200 °C). Scanning electron microscopes equipped with EDS and EBSD were used for the microstructure and phase...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2018-05, Vol.49 (5), p.1598-1603
Main Authors: Kratochvíl, Petr, Švec, Martin, Král, Robert, Veselý, Jozef, Lukáč, Pavel, Vlasák, Tomáš
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Creep strength
Ferrous alloys
High temperature
Hot rolling
Intermetallic compounds
Iron aluminides
Laves phase
Materials Science
Mechanical properties
Metallic Materials
Metallurgy
Microscopes
Microstructure
Nanotechnology
Precipitates
Structural Materials
Surfaces and Interfaces
Thin Films
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Summary:The microstructural and high-temperature mechanical properties of Fe–26Al– x Nb ( x  = 3 and 5 at. pct) are compared. The alloys were investigated “as cast” and after hot rolling at 1473 K (1200 °C). Scanning electron microscopes equipped with EDS and EBSD were used for the microstructure and phase identification. The addition of 3 at. pct of Nb into the Fe 3 Al matrix leads to the formation of C14 λ—Laves phase (Fe,Al) 2 Nb (LP) particles spread in the Fe 3 Al matrix, while an eutectic with thin lamellae of LP C14 λ—Laves phase (Fe,Al) 2 Nb and matrix is also formed in the iron aluminide with 5 at. pct of Nb. The presence of incoherent precipitates is connected with the enhancement of the high-temperature strength and creep resistance.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-018-4524-4