Reaction synthesis of FeAl alloys

Joslin, D.L.; Easton, D. S.; Liu, Chang; David, S. A.

doi:10.1016/0921-5093(94)03272-6

Cited by 39 publications

(14 citation statements)

References 7 publications

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“…However, some authors reported these exothermic reactions at moderate temperatures, especially in context with fabrication of intermetallic materials from elemental Al-Fe powders, and putted them in relation with formation of Fe-Al solid solutions or intermetallic phases, such as FeAl 3 , FeAl 2 , Fe 2 Al 5 , Fe 3 Al or FeAl [18,[20][21][22][23][24][25]. Exothermic reactions were also connected by some authors with some complex oxidation phenomena [26][27][28], initiated below the melting temperature of Al.…”

Section: Dsc Investigationsmentioning

confidence: 98%

Optimizing the parameters for in situ fabrication of hybrid Al-Al2O3 composites

Nicoară

Locovei

Opriș

et al. 2016

J Therm Anal Calorim

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A new powder metallurgy technique was developed in order to increase the reinforcement proportion of aluminum with two different fractions of Al 2 O 3 . Aluminum powders were mixed with 20 % vol of alumina particles as primarily reinforcement, and additional alumina was produced in situ as a result of reaction between Al and additional 7.5 % vol of Fe 2 O 3 powder. The three grades of powders were milled and hot-pressed into small preforms, and differential scanning analysis (DSC) was performed to determine the kinetics of microstructural transformations produced on heating. DSC curves were mathematically processed to separate the superposing effects of thermal reactions. Transformation points on resulting theoretical curves evidenced two distinct exothermal reaction peaks close to the melting point of aluminum that were correlated with formation of Fe-Al compounds and oxidation of aluminum. Microstructural investigations by means of SEM-EDX and XRD suggested that these exothermal reactions produced complete decomposition of iron (III) oxide and formation of Fe-Al compounds during sintering at 700°C, and therefore, heating at higher temperatures would not be necessary. These results, along with calculation of activation energies, based on Kissinger's method, could be used to optimize the fabrication of Al-Al 2 O 3 composites by means of reactive sintering at moderate temperatures.

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Section: Dsc Investigationsmentioning

confidence: 98%

Optimizing the parameters for in situ fabrication of hybrid Al-Al2O3 composites

Nicoară

Locovei

Opriș

et al. 2016

J Therm Anal Calorim

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“…The distribution of Ni and Cr was lessening gradually from the surface of infiltrated composite layer to the substrate. But the diffusion extent of Ni was much longer than that of Cr because the diffusion activation of Ni was smaller that that of Cr and the diffusion coeffi cient of Cr is smaller than that of Ni [16,17] so that the diffusion of Cr could not nearly happen in infi ltrated layer and the content of Ni changes slowly from outer layer to substrate. Fig.5 shows that the diffusion area was very small.…”

Section: Microstructure Of Infi Ltrated Layermentioning

confidence: 99%

Microstructure of Ni / WC surface composite layer on gray iron substrate

Yang

Song²,

et al. 2011

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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The surface infiltrated composite (Ni/WC) layers on gray iron substrate were fabricated through a vacuum infi ltration casting technique (VICT) using Ni-based composite powder with different WC particles content as raw materials. The microstructures of surface infiltrated composite layer, the interface structures between surface composite layer and the substrate, the changes of macro-hardness with the increasing of WC content and the micro-hardness distribution are investigated. The infi ltrated composite layer includes a surface composite layer and a transition layer, and the thickness of the transition layer decreases with the increasing content of WC. The thickness of transition layer with 20%WC content in the surface infiltrated composite layer was 170 μm which was the thickest for all transition layers with different WC content. The surface composite layer was mainly composed of WC, W 2 C, FeB and NiB, along with Ni-Cr-Fe, Ni (Cr) solid solution, Ni (Si) solid solution and Ni (Fe) solid solution. The transition layer was composed of Ni (Cr) solid solution, Ni (Fe) solid solution, Ni (Si) solid solution, Fe (Ni) solid solution and eutectic. The surface macrohardness and micro-hardness of the infiltrated layer had been evaluated. The macro-hardness of the surface composite layer decreases with the WC content increasing, and the average macro-hardness is HRC60. The distribution of micro-hardness presents gradient change. The average micro-hardness of the infi ltrated layer is about HV1000.

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“…FeAl 2 is not observed even when the formation of this phase is thermodynamically possible, [16] which is in agreement with the literature. [17][18][19][20] 2. Inside the Matrix A cross-section image of both the coating and the matrix obtained after exposure in liquid Al for 8 hours is presented in Figure 4.…”

Section: Coatingmentioning

confidence: 99%

Corrosion Mechanisms of Steel and Cast Iron by Molten Aluminum

Balloy

Tissier

Giorgi

et al. 2010

Metall Mater Trans A

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International audienceThe corrosion mechanisms by liquid aluminum of three industrial materials have been studied: unalloyed steel (UAS), and ferritic and modified pearlitic cast irons (FCI and PCI, respectively). The behavior of these materials when in contact with liquid aluminum is different. Aluminum diffuses deep into the UAS and forms intermetallic compounds with iron at the surface and in the steel matrix. At the surface, only Fe2Al5 and FeAl3 are found. In the matrix, FeAl2 also is formed in agreement with the equilibrium Fe-Al diagram. From the matrix to FeAl2, the Al content in the ferrite increases progressively until Al saturation is reached. At this step, black elongated precipitates (Al4C3 and/or graphite) appear. Graphite lamellas present in both FCI and PCI constitute an efficient barrier to the Al diffusion. The high silicon content of the FCI leads to the formation of a phase free from Al and saturated in Si. For the PCI, a thin layer rich in Al and Si, which is formed between the matrix and Fe2Al5, limits the diffusion of atoms. The effects of Cr and P added in the PCI also are discussed

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Reaction synthesis of FeAl alloys

Cited by 39 publications

References 7 publications

Optimizing the parameters for in situ fabrication of hybrid Al-Al2O3 composites

Optimizing the parameters for in situ fabrication of hybrid Al-Al2O3 composites

Microstructure of Ni / WC surface composite layer on gray iron substrate

Corrosion Mechanisms of Steel and Cast Iron by Molten Aluminum

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