Iron Aluminides

Palm, Martin; Stein, Frank; Dehm, Gerhard

doi:10.1146/annurev-matsci-070218-125911

Cited by 97 publications

(42 citation statements)

References 238 publications

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“…Through different alloying concepts, e.g. strengthening coherent or incoherent second phases such as borides or Laves phase precipitates, the mechanical properties of iron aluminides can be further enhanced at higher temperatures [2,3]. In many Fe-Al-X systems the Laves phase forms directly from the melt and solidifies as coarse dendrites [4,5].…”

Section: Introductionmentioning

confidence: 99%

Development of new Fe–Al–Nb(–B) alloys for structural applications at high temperatures

2021

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It is known for Fe–Al–Ta alloys, that a homogeneous distribution of strengthening Laves phase precipitates in the matrix and aligned at the grain boundaries can be obtained when the formation of the stable Laves phase is preceded by the formation of the metastable Heusler phase. Several Fe–Al–Nb alloys with different Al and Nb contents and with or without boron doping are studied to elucidate whether comparable microstructures can be obtained in this system. It was found that the Heusler phase only occurs within a limited composition range. The time-dependent evolution of the microstructure shows that the transformation proceeds faster in Fe–Al–Nb alloys. Microhardness was measured in dependence on the microstructural evolution with increasing annealing time, and compressive yield stress was determined for alloys annealed 700 °C/1000 h to evaluate the influence of microstructure and composition. Graphic Abstract

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Section: Introductionmentioning

confidence: 99%

Development of new Fe–Al–Nb(–B) alloys for structural applications at high temperatures

2021

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“…pct and can be used for high-temperature applications in which the working temperature can reach up to 800°C. [6,7] However, for mechanical parts which work under abrasive conditions, the hardness of 300 HV up to 400 HV of FeAl-based alloys is too low. [8][9][10] Therefore, surface modification methods such as thermochemical surface treatments are applied to enhance the surface hardness and to improve the friction properties and wear resistance.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nitriding Potential KN on the Formation and Growth of a “White Layer” on Iron Aluminide Alloy

Schimpf

Biermann

et al. 2020

Metall Mater Trans B

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This paper investigates the effect of nitriding potential under well-defined gas nitriding conditions on the formation and growth of a compound layer called “white layer” on a FeAl40 (with the composition of 40 at. pct Al) iron aluminide alloy. The nitriding potential was systematically varied in the range of 0.1 to 1.75 bar−1/2 at 590 °C for 5 hour nitriding time with an ammonia-hydrogen-nitrogen atmosphere. Characterization of the microstructure and phases formed within the white layer was performed using optical and scanning electron microscopy, X-ray diffraction (XRD), electron backscatter diffraction (EBSD), and glow discharge optical emission spectroscopy (GDOES). Experimental results indicated that the nitriding potential strongly influences morphology and crystal structure of the white layer. The nitride compound layer consists of the phases γ′-Fe4N, ε-Fe2-3N, and AlN. A mechanism is proposed for the formation and growth of the white layer, depending on the effect of the nitriding potential.

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“…Moreover, the Al contents of these compounds induce the formation of a passive layer of Al oxide, which is responsible for very good corrosion and oxidation resistance at elevated temperatures [11]. Iron aluminides of the type Fe-Al and Fe3Al exhibit excellent mechanical resistance at high temperatures, low densities, high melting points, and good structural stability; however, efforts were applied to enhance the ductility and impact resistance of these compounds [12].…”

Section: Introductionmentioning

confidence: 99%

The Synthesis of Aluminum Matrix Composites Reinforced with Fe-Al Intermetallic Compounds by Ball Milling and Consolidation

Díaz

Segura

Barragán³

et al. 2021

Applied Sciences

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In this study, a nano-composite material of a nanostructured Al-based matrix reinforced with Fe40Al intermetallic particles was produced by ball milling. During the non-equilibria processing, the powder mixtures with the compositions of Al-XFe40Al (X = 5, 10, and 15 vol. %) were mechanically milled under a low energy regime. The processed Al-XFe40Al powder mixtures were subjected to uniaxial pressing at room temperature. Afterward, the specimens were subjected to a sintering process under an inert atmosphere. In this thermal treatment, the specimens were annealed at 500 °C for 2 h. The sintering process was performed under an argon atmosphere. The crystallite size of the Al decreased as the milling time advanced. This behavior was observed in the three specimens. During the ball milling stage, the powder mixtures composed of Al-XFe40Al did not experience a mechanochemical reaction that could lead to the generation of secondary phases. The crystallite size of the Al displayed a predominant tendency to decrease during the ball milling process. The microstructure of the consolidated specimens indicated a uniform dispersion of the intermetallic reinforcement phases in the Al matrix. Moreover, according to the Vickers microhardness tests, the hardness varied linearly with the increase in the concentration of the Fe40Al intermetallic phase present in the composite material. The presented graphs indicate that the hardness increased almost linearly with the increasing dislocation density and with the reduction in grain sizes (both occurring during the non-equilibria processing). The microstructural and mechanical properties reported in this paper provide the aluminum matrix composite materials with the ideal conditions to be considered candidates for applications in the automotive and aeronautical industries.

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Iron Aluminides

Cited by 97 publications

References 238 publications

Development of new Fe–Al–Nb(–B) alloys for structural applications at high temperatures

Development of new Fe–Al–Nb(–B) alloys for structural applications at high temperatures

Effect of Nitriding Potential KN on the Formation and Growth of a “White Layer” on Iron Aluminide Alloy

The Synthesis of Aluminum Matrix Composites Reinforced with Fe-Al Intermetallic Compounds by Ball Milling and Consolidation

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