FeAl-based alloys cast in an ultrasound field

Šı́ma, V.; Kratochvı́l, Petr; Kozelský, Petr; Schindler, Ivo; Hana, P.

doi:10.3139/146.110041

Cited by 20 publications

(15 citation statements)

References 11 publications

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“…At high temperatures (1002e1232 C) ε-Fe 5 Al 8 phase [17] and solid solution of aluminium in fcc iron are stable. From this list, Fe 3 Al and FeAl ordered phases are of the greatest importance for technical applications.…”

Section: Introductionmentioning

confidence: 99%

“…When FeAl and Fe 3 Al phases are being produced by powder metallurgy using reactive sintering, it can be expected that interdiffusion of iron and aluminium will occur and ordered phases will be formed after being heated to sufficient temperature. Simultaneously, the densifying of the material by sintering of powder particles would happen as e.g.…”

Section: Introductionmentioning

confidence: 99%

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On the formation of intermetallics in Fe–Al system – An in situ XRD study

et al. 2013

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a b s t r a c tSelf-propagating high-temperature synthesis (SHS) was previously proposed as alternative preparation route for FeeAl intermetallics. However, this process was not optimized and the mechanism and kinetics of the phases' formation was not fully clarified up to current days. In this work, in situ high energy X-ray diffraction analysis was carried out during the SHS process and the mechanism of the intermetallic' formation in FeAl25 powder mixture was described during rapid heating and isothermal annealing at 800 C as well as during a slower continuous heating to 900 C. During slower heating, the formation of Fe 2 Al 5 and FeAl 2 intermetallics starts below the melting point of aluminium. When the heating rate is high, intermetallics are created after melting of aluminium. During long-term annealing, all of the phases can be transformed to FeAl phase when fine powders were applied. Detailed mechanism is proposed in this paper and kinetics of the intermetallics' formation is described.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the formation of intermetallics in Fe–Al system – An in situ XRD study

et al. 2013

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“…The molten metal was cast into the divided cast-iron moulds. The rectangular samples (with thickness 19.4 mm, width 33 mm and length 100 mm) were obtained by melting and casting in the vacuum laboratory furnace, using ultrasound that improves the chemical and structural homogeneity of the casting [13]. The castings were protected by the above described capsules and rolled on the laboratory four-high mill stand K350 by 7 reversible passes to the nominal thickness of 6 mm (without the steel layers).…”

Section: Methodsmentioning

confidence: 99%

Optimization Of Laboratory Hot Rolling Of Brittle Fe-40at.%Al-Zr-B Aluminide

Schindler

Hadasik

Kopeček

et al. 2015

Archives of Metallurgy and Materials

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Use of the protective steel capsules enabled to manage the laboratory hot flat rolling of the extremely brittle as-cast aluminide Fe-40at.%Al-Zr-B with the total height reduction of almost 70 %. The hot rolling parameters were optimized to obtain the best combination of deformation temperature (from 1160°C up to 1240°C) and rolling speed (from 0.14 m·s−1 to 0.53 m·s−1). The resistance against cracking and refinement of the highly heterogeneous cast microstructure were the main criteria. Both experiments and mathematical simulations based on FEM demonstrated that it is not possible to exploit enhanced plasticity of the investigated alloy at low strain rates in the hot rolling process. The heat flux from the sample to the working rolls is so intensive at low rolling speed that even the protective capsule does not prevent massive appearance of the surface transverse cracking. The homogeneity and size of product’s grain was influenced significantly by temperature of deformation, whereas the effect of rolling speed was relatively negligible. The optimal forming parameters were found as rolling temperature 1200°C and the rolling speed 0.35 m·s−1. The effective technology of the iron aluminide Fe-40at.% Al-Zr-B preparation by simple processes of melting, casting and hot rolling was thus established and optimized.

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“…Result of the chemical analysis of the alloys is given in Table 1. For alloy with boron addition, the extra ultrasonic solidification [22] was used in order to decrease the amount of casting defects. In total, 10 ingots from each alloy were prepared.…”

Section: Experimental Methodsmentioning

confidence: 99%