Experimental determination of phase equilibria in the FeAlC system

Palm, Martin; Inden, Gerhard

doi:10.1016/0966-9795(95)00003-h

Cited by 167 publications

(138 citation statements)

References 12 publications

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“…Carbides are formed from the liquid directly through a peritectic transformation although the temperature of transformation is uncertain. Palm et al made an extensive investigation related to the K phase in the Fe-Al-C system between 800 C and the liquidus surface [19]. According to them, the K phase forms at about 1400 C. The interdendritic morphology of the carbides, as revealed by the micrograph, is in agreement with the phase diagram.…”

Section: Phase Identification and Microstructure Analysissupporting

confidence: 49%

Effect of Al content on oxidation behaviour of ternary Fe–Al–C alloys

2002

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Iron aluminides produced by the electroslag refining technique, having the compositions: (1) Fe-16Al-1C, (2) Fe-10Al-1C, and (3) Fe-8Al-1C were used to investigate the effect of Al on the oxidation behaviour of the Fe-1C-Al system at 700 to 1000 C. Prior to oxidation studies, phase and microstructure of alloys were analysed. The carbide phase, Fe 3 AlC 0.69 , was found to be distributed in the Fe 3 Al matrix in alloy 1 and (Fe-Al) matrix in alloys 2 and 3. The low Al content alloys displayed inversion in the oxidation kinetics below 800 C, while, high Al content alloy displayed inversion phenomena at 1000 C. The mechanism involving inversion in oxidation kinetics was found to be different in the two cases. In the former, it was attributed to the preferential oxidation of Al, while in the latter, to the phase transformation within the Al 2 O 3 . Carbides in the alloy having low Al content showed instability during oxidation.

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Section: Phase Identification and Microstructure Analysissupporting

confidence: 49%

Effect of Al content on oxidation behaviour of ternary Fe–Al–C alloys

2002

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“…13͒ and Fe-Ga, 12 the FeAl-C system is likely representative of the phase equilibria of Fe-Ga-C. Three isotherms at 800, 1000, and 1200°C have been published for the Fe-Al-C system. 26 Fe-Ga-C alloys in this study were water quenched from 1000°C; therefore, the 1000°C isotherm is particular relevant to the water quenched conditions. From this isotherm, it can be clearly seen that the phase boundary for the A2 phase is pushed to higher Al content by the addition of carbon, 26 which is consistent with the present result that the MS for the Fe-Ga-C alloys peaked at a higher Ga concentration than the binary alloys in the A2 region.…”

Section: Discussionmentioning

confidence: 99%

Effect of carbon addition on the single crystalline magnetostriction of Fe-X (X=Al and Ga) alloys

Huang

McQueeney

et al. 2010

Journal of Applied Physics

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The effect of carbon addition on the magnetostriction of Fe-Ga and Fe-Al alloys was investigated and is summarized in this study. It was found that the addition of carbon generally increased the magnetostriction over binary alloys of Fe-Ga and Fe-Al systems. The formation of carbide in the Fe-Ga-C alloys with a composition near D0 3 phase region decreased the magnetostriction drastically. Fe-Al-C and Fe-Ga-C alloys responded differently to thermal treatments; the magnetostriction in the quenched Fe-Al-C alloys is equal to or slightly lower than that of the slow cooled as is observed in binary Fe-Al alloy; in contrast, the magnetostriction is generally higher in quenched Fe-Ga-C alloys than slow cooled condition, consistent with the behavior of binary alloys of Fe-Ga. A significant increase in magnetostriction between 25% and 165% depending on the phase region in Fe-Ga-C alloys by quenching was observed in the A2+D0 3 two-phase region and D0 3 single phase region. KeywordsPhysics and Astronomy, IPRT, alloying additions, aluminium alloys, carbon, gallium alloys, iron alloys, magnetostriction, quenching (thermal) Disciplines Condensed Matter Physics | Metallurgy CommentsThe following article appeared in Journal of Applied Physics 107 (2010) The effect of carbon addition on the magnetostriction of Fe-Ga and Fe-Al alloys was investigated and is summarized in this study. It was found that the addition of carbon generally increased the magnetostriction over binary alloys of Fe-Ga and Fe-Al systems. The formation of carbide in the Fe-Ga-C alloys with a composition near D0 3 phase region decreased the magnetostriction drastically. Fe-Al-C and Fe-Ga-C alloys responded differently to thermal treatments; the magnetostriction in the quenched Fe-Al-C alloys is equal to or slightly lower than that of the slow cooled as is observed in binary Fe-Al alloy; in contrast, the magnetostriction is generally higher in quenched Fe-Ga-C alloys than slow cooled condition, consistent with the behavior of binary alloys of Fe-Ga. A significant increase in magnetostriction between 25% and 165% depending on the phase region in Fe-Ga-C alloys by quenching was observed in the A2 + D0 3 two-phase region and D0 3 single phase region.

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“…The temperature at such parts should be higher than the temperature measured at the die. According to a Fe-Al-C ternary equilibrium phase diagram, 23) the composition of the MAed powder is in the þ dual phase region at the sintering temperature of 1273 K. However, the -phase can be formed at parts where the localized heating occur since the -phase is stable in a wider range of composition at higher temperature. Then, the amount of the -carbide precipitates dispersion decreases since a large amount of carbon can dissolve into -phase from the carbides.…”

Section: Formation Mechanism Of Coarse -Grainsmentioning

confidence: 99%

Densification and Structural Evolution in Spark Plasma Sintering Process of Mechanically Alloyed Nanocrystalline Fe-23Al-6C Powder

et al. 2003

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Nanocrystalline Fe-23 at%Al-6 at%C alloy powder was produced by mechanical alloying of the mixture of iron powder and aluminum powder (Fe-25 at%Al) with methanol, and was consolidated into fully dense compact by spark plasma sintering (SPS) at 1273 K. The compacts have nanocrystalline microstructure composed of mixture of -phase grains and -carbide (Fe 3 AlC) grains whose average grain size is about 50 nm. Although relatively large grains were also observed in places, their sizes were not over a few micrometers. The mechanisms of the densification and the structural evolution during the SPS process are discussed.

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Experimental determination of phase equilibria in the FeAlC system

Cited by 167 publications

References 12 publications

Effect of Al content on oxidation behaviour of ternary Fe–Al–C alloys

Effect of Al content on oxidation behaviour of ternary Fe–Al–C alloys

Effect of carbon addition on the single crystalline magnetostriction of Fe-X (X=Al and Ga) alloys

Densification and Structural Evolution in Spark Plasma Sintering Process of Mechanically Alloyed Nanocrystalline Fe-23Al-6C Powder

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