Formation enthalpy of intermetallic phases from Al–Fe system measured with solution calorimetric method

Gąsior, W.; Dębski, A.; Moser, Z.

doi:10.1016/j.intermet.2012.02.001

Cited by 34 publications

(13 citation statements)

References 23 publications

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“…As can be expected from the phase diagram of the Fe-Al system ( Fig. 1), 2) several alloy phases can be formed by the treatment. The oxidation-resistance of the alloys should increase with increasing Al content, because their oxidation-resistance is based on the capability of forming a dense, protective Al 2 O 3 surface layer.…”

Section: Introductionsupporting

confidence: 66%

Iron Aluminide Coatings by Electrodeposition of Aluminum from an Organic Bath and Subsequent Annealing

2012

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Oxidation-resistant Fe-Al alloy coatings were formed on Fe substrate by a process using electrodeposition of Al and annealing. Electrodeposition in a dimethylsulfone-aluminum chloride bath containing an additive at 110°C yielded a dense Al layer adherent to the Fe substrate. Annealing of the Fe substrate with the electrodeposited Al layer generated an Fe2Al5 layer on the surface at 700°C and 800°C, and an FeAl layer at 900°C through interdiffusion. Oxidation tests at 600°C and 800°C confirmed that the FeAl layer formed through the process could act as an oxidation-resistant coating.

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Section: Introductionsupporting

confidence: 66%

Iron Aluminide Coatings by Electrodeposition of Aluminum from an Organic Bath and Subsequent Annealing

2012

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“…In a similar study, for Al-34 at.%Fe, Al-25 at.%Fe, Al-25 at.%Fe and Al-20 at.%Fe system, respectively, crystalline phases were evidenced by Enzo et al and Cardellini et al [19,20]. For a composition range of Al-34.7-35.3 at.%Fe intermetallic phase, Al 5 Fe 2 along with Al 2 Fe was observed by Gasior et al [21]. A comparison of the phases formed in Al-Fe alloys as analysed from the X-ray diffraction (XRD) traces is given in Table 2.…”

Section: Al-fe Intermetallics By Mechanical Alloying/mechanical Millingsupporting

confidence: 54%

Structural and Mechanical Behaviour of Al-Fe Intermetallics

Basariya¹,

KrishnaMukhopadhyay²

2018

Intermetallic Compounds - Formation and Applications

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In this chapter, results of our recent investigations on Al-25%Fe (at.%), Al-30%Fe and Al-34.5%Fe alloys close to Al 3 Fe, Al 5 Fe 2 and Al 2 Fe intermetallic phases have been discussed. The effect of process parameters on structural aspects and mechanical behaviour of Al-Fe intermetallics has been studied. The high melting intermetallics that are difficult to prepare by conventional processing technique are easily synthesized in nanocrystalline state with a homogeneous structure by mechanical means. In this process, we have come out with a single orthorhombic Al 5 Fe 2 nanocrystalline intermetallic phase. Hardness measurements of intermetallic revealed an increase in hardness with a decreasing grain size up to a critical grain size, followed by a decrease. A decrease in hardness with a grain size refinement, an indication of softening behaviour, demonstrating the Inverse Hall-Petch (IHP)-like phenomenon has been observed in intermetallic compounds. The deviation from the regular Hall-Petch (HP) behaviour has been discussed using various deformation models based on the dislocations and grain boundary-mediated processes. The study is focused on investigations of Al-rich iron aluminide intermetallics to understand the structure property correlations. and exhibit different crystal structure and properties than their constituent elements. The composition of an intermetallic may vary within a restricted composition range known as homogeneity range. Since 2500 BC, metallurgists have used intermetallics, and its phases have attracted significant interests during the last few decades since they offer new prospects for developing structural materials for high-temperature applications. IntermetallicsAn increased need for new and novel materials with specified properties and particular application has attracted greater attention of metallurgists and material scientists in recent years.Intermetallics are one such material with a vast potential for application in a wide range of technologically important areas [1]. The first observation of an intermetallic was made in 1839 by Karl Karsten, when he observed a discontinuity in the action of acids on alloys of copper and zinc at the equi-atomic composition and suggested the formation of a compound. The compound is now popularly called as β-brass (CuZn). Intermetallics are already indispensable in many applications and offer the possibility of providing additional breakthrough in performance in, for example, high-temperature structural materials, magnetic materials and hydrogen storage materials. As a by-product of amorphization studies or alloying development, nanocrystalline intermetallic compounds can be synthesized. Nanocrystalline intermetallics possess improved mechanical properties at an ambient temperature. Bohn et al. [2] have suggested that nanocrystalline intermetallic compounds may have improved mechanical properties. Their study concludes several possible ways of improving strength and ductility. However, the strength of elemental nanocrystalline metals can be increa...

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“…The application window shown in Fig. 6 presents the values of the enthalpy of formation of the Al 3 Ni 2 , phase, the heat of solution of Ni in Al and Al in Ni, which are calculated by means of equations (7)(8), as well as the parameters of the Mediema model which were used in the calculation of the values of the enthalpy of formation of intermetallic phases belonging to the Al-Ni system.…”

Section: Miedema Modelmentioning

confidence: 99%

“…This is why the data for the enthalpy of formation for the Al 3 Ti phase obtained from both methods are similar, whereas for the AlTi and AlTi 3 phases, we can observe differences in the enthalpy of formation values, which points to the fact that the reaction of the phase formation was not finalized in the calorimeter, this being the reason for the difference in the results obtained from these two methods. The calorimetric data of the enthalpy of formation of the intermetallic phases from the Al-Fe-Ni-Ti type systems obtained by Rzyman et al [1][2][3] as well as in our own studies [6][7][8][9][10] was introduced into the Entall database [11], which is available at www.entall.imim.pl.…”

Section: Introductionmentioning

confidence: 99%

New Features of Entall Database: Comparison of Experimental and Model Formation Enthalpies/ Nowe Funkcje Bazy Danych Entall: Porównanie Doświadczalnych I Modelowych Entalpii Tworzenia

Dębski¹,

Debski²,

Gąsior³

2014

Archives of Metallurgy and Materials

113

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This paper presents a new version of the Entall database of the thermodynamic properties of metals and their alloys. The changes are related to the thermodynamic data of new binary and ternary systems as well as the integration of the database with an application for the modeling of the formation enthalpies of intermetallic phases with the use of the Miedema model. Using this tool, calculations of the enthalpies of formation of 38 intermetallic phases from 12 binary systems were performed and a comparative analysis conducted. The results of the analysis clearly showed a weak correlation between the model and experimental data. To improve this correlation, an intermediate method of proportional change was proposed, on the basis of the measurement of the enthalpy of formation for one of the phases. The values for the other phases obtained from this indirect method should not deviate much from the experimental ones provided that before the measurements (dissolving or pulping) or after them (direct synthesis), the phase being examined should undergo structural tests, in order to confirm its dominating amount in the samples.Keywords: COST 535, database, thermodynamic properties, Miedema model W pracy przedstawiona została nowa wersja bazy właściwości termodynamicznych metali i stopów Entall. Modyfikacja dotyczyła z jednej strony danych termodynamicznych nowych układów dwu i trójskładnikowych a z drugiej zaadaptowania do niej opracowanego programu (kalkulatora) do modelowania entalpii tworzenia faz międzymetalicznych modelem Miedemy. Korzystając z tego nowego narzędzia wykonane zostały obliczenia entalpii tworzenia dla 38 faz międzymetalicznych z 12 układów dwuskładnikowych oraz przeprowadzona została analiza porównawcza. Wyniki analizy pokazały jednoznacznie słabą korelację między danymi modelowymi i doświadczalnymi. Dla poprawienia tej korelacji zaproponowana została pośrednia metoda proporcjonalnej zmiany w oparciu o pomiar entalpii tworzenia dla jednej z faz. Uzyskane z tej pośredniej metody wartości dla innych faz powinny niewiele odbiegać od eksperymentalnych przy spełnieniu warunku, że faza dla której wykonywane były badania została przed pomiarami (rozpuszczanie lub roztwarzanie) lub po nich (bezpośrednia synteza) poddana badaniom strukturalnym, w celu potwierdzenia jej dominującej ilości w próbkach.

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Formation enthalpy of intermetallic phases from Al–Fe system measured with solution calorimetric method

Cited by 34 publications

References 23 publications

Iron Aluminide Coatings by Electrodeposition of Aluminum from an Organic Bath and Subsequent Annealing

Iron Aluminide Coatings by Electrodeposition of Aluminum from an Organic Bath and Subsequent Annealing

Structural and Mechanical Behaviour of Al-Fe Intermetallics

New Features of Entall Database: Comparison of Experimental and Model Formation Enthalpies/ Nowe Funkcje Bazy Danych Entall: Porównanie Doświadczalnych I Modelowych Entalpii Tworzenia

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