Influence of Cr addition on the defect structure of Fe–Al alloys

Ortega, Y.; Diego, N. de; Plazaola, F.; Jiménez, José Antonio; Rı́o, J. del

doi:10.1016/j.intermet.2006.05.004

Cited by 12 publications

(3 citation statements)

References 27 publications

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“…In alloys with 28% aluminum contents positron lifetimes in the range of 179÷186 ps have been obtained, while longer lifetimes have been noted for alloys with higher aluminum contents -188÷192 ps. The obtained positron lifetime values for Fe-28Al and Fe-28Al-5Cr have been attributed to positron lifetime in a monovacancy in iron sublattice, according to theoretical and experimental values published in the literature [13,14]. Higher τ V values for Fe-28Al and Fe-28Al-5Cr samples quenched to oil are probably connected with a change of local neighborhood around the vacancy, because the observed increase in lifetime may be a result of an increase in number of aluminum in the direct neighborhood of the vacancy, as it has been proven in [14].…”

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confidence: 66%

Determination of Thermal Diffusivity and Influence of Defect Structure in Alloys Based on the Fe-Al System

Bernstock-Kopaczyńska

Jabłońska

2013

DDF

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Alloys of the Fe-Al system are interesting due to occurrence of long-range order and many thermal vacancies at high temperature, which lead to not only significant hardening, but also cause changes of physical properties. High temperature diffusion is conditioned by structural defects in solids, such as vacancies, foreign atoms and dislocations influencing thermal characteristics of a solid solution, among others the thermal diffusivity coefficient. Measurement of thermal diffusivity was performed at room temperature using the laser flash method. For characterization of the defect structure, positron annihilation lifetime spectroscopy was used. The data were presented for alloys with 28 and 38 at.% aluminium without chromium and containing 5 at. % Cr addition. The results showed that thermal diffusivity decreased with aluminium content and deviation from stoichiometry. In the studies, different structural defects in the alloys were observed.

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confidence: 66%

Determination of Thermal Diffusivity and Influence of Defect Structure in Alloys Based on the Fe-Al System

Bernstock-Kopaczyńska

Jabłońska

2013

DDF

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“…A wide range of unusual properties, such as predicted half metallicity, ordered L2 1 structure in slight off stoichiometric Fe 2 CrAl composition [5], room temperature ferromagnetism, soft ferromagnetic-like behaviour in bulk [6] and nanostructured Fe 2 CrAl [7], semiconductor-like behaviour in resistivity with negative value of temperature coefficient of resistance (TCR), magnetoresistance [8], excellent corrosion resistance [9,10] have been reported by fine tuning of composition and process parameters. In this article, preliminary investigations on the magnetic and transport properties of a thin film of Fe 2 CrAl are presented.…”

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confidence: 99%

Magnetic and transport properties in thin film of Fe₂CrAl

Jani

Nehra

Jain

et al. 2012

Journal of Experimental Nanoscience

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Preliminary results on magnetic and transport properties of a thin film of disordered Fe 2 CrAl deposited on (111) Si by pulsed laser deposition is reported in this study. While the bulk arc melted ingot used as target for the deposition is purely ferromagnetic, the film shows the co-existence of different magnetic phases, which arises due to the granular nature of the film. This is because, although the average composition pertains to Fe 2 CrAl, local disorder results in the formation of grains with different magnetic states that may be ferromagnetic or may consist of magnetic clusters. The resulting magnetic inhomogeneity of the thin film leads to large values of negative temperature coefficient of resistance of $22%/K at 260 K.

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“…The presence of chromium in the aluminide phases can be very beneficial. Chromium can improve the mechanical behavior without significantly affecting the corrosion properties of the material [ 36 ]. According to Klein and Baker [ 37 ], the addition of 5% Cr to a Fe 55 Al 45 alloy significantly increases both the yield and fracture strengths.…”

Section: Discussionmentioning

confidence: 99%

Resistance of Aluminide Coatings on Austenitic Stainless Steel in a Nitriding Atmosphere

2021

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A new slurry cementation method was used to produce silicide-aluminide protective coatings on austenitic stainless steel 1.4541. The slurry cementation processes were carried out at temperatures of 800 and 1000 °C for 2 h with and without an additional oxidation process at a temperature of 1000 °C for 5 min. The microstructure and thickness of the coatings were studied by scanning electron microscopy (SEM). The intention was to produce coatings that would increase the heat resistance of the steel in a nitriding atmosphere. For this reason, the produced coatings were subjected to gas nitriding at a temperature of 550–570 °C in an atmosphere containing from 40 to 60% of ammonia. The nitriding was carried out using four time steps: 16, 51, 124, and 200 h, and microstructural observations using SEM were performed after each step. Analysis of the chemical composition of the aluminide coatings and reference sample was performed using wavelength (WDS) and energy (EDS) dispersive X-ray microanalysis, and phase analysis was carried out using X-ray diffraction (XRD). The resistance of the aluminide coatings in the nitriding atmosphere was found to depend strongly on the phase composition of the coating. The greatest increase in resistance to gas corrosion under nitriding atmosphere conditions was achieved using a manufacturing temperature of 1000 °C.

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Influence of Cr addition on the defect structure of Fe–Al alloys

Cited by 12 publications

References 27 publications

Determination of Thermal Diffusivity and Influence of Defect Structure in Alloys Based on the Fe-Al System

Determination of Thermal Diffusivity and Influence of Defect Structure in Alloys Based on the Fe-Al System

Magnetic and transport properties in thin film of Fe₂CrAl

Resistance of Aluminide Coatings on Austenitic Stainless Steel in a Nitriding Atmosphere

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Influence of Cr addition on the defect structure of Fe–Al alloys

Cited by 12 publications

References 27 publications

Determination of Thermal Diffusivity and Influence of Defect Structure in Alloys Based on the Fe-Al System

Determination of Thermal Diffusivity and Influence of Defect Structure in Alloys Based on the Fe-Al System

Magnetic and transport properties in thin film of Fe2CrAl

Resistance of Aluminide Coatings on Austenitic Stainless Steel in a Nitriding Atmosphere

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Magnetic and transport properties in thin film of Fe₂CrAl