Estimation of Kinetic Parameters for Combustion Synthesis of FeAl Intermetallic Compound by Dipping Experiment of Fe Wire into Al Melt

Hibino, Atsushi

doi:10.2320/matertrans.m2009319

Cited by 15 publications

(7 citation statements)

References 17 publications

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“…[6] then describe even a FeAl 3 / Fe 2 Al 5 / FeAl 2 / FeAl sequence, beginning at the temperature lower than 600 C. On the other hand, Hibino at al. [22] stated that aluminium melts before the formation of intermetallics. After that, Fe 2 Al 5 , Fe 2 Al 3 and FeAl phases are gradually formed.…”

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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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%

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

et al. 2013

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“…This is because aluminum contained in the shot particle surfaces was transferred to the surface of the specimen during the FPP process. 14,19) The thickness of the Al transfer layer was approximately 20 μm, and was the same for all specimens. This means that the amount of transferred Al was almost the same in each case due to the same peening time being used.…”

Section: Characterization Of the Surface Modified Layermentioning

confidence: 99%

“…This trend is similar to that of the results of a previous study wherein the same treatment was performed for titanium alloy, and an aluminum transferred layer and a Ti-Al intermetallic compound layer were formed on the titanium alloy surface after FPP without subsequent heating. 14) The formation of the compound layer at a relatively low heating temperature within a short span of time during AIH-FPP is attributed to the occurrence of a combustion synthesis reaction between Fe and Al 20) and to the local increase in the temperature of the treated surface. 13) According to the XRD data (Fig.…”

Section: Mechanism Of the Surface Modified Layer Formation By Aih-fppmentioning

confidence: 99%

Formation of Fe–Al Intermetallic Compound Layer by AIH-FPP and its Effect on Tribological Properties of Stainless Steel

Takesue

Misaka²,

Komotori

2021

ISIJ Int.

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In order to increase the surface hardness and improve the tribological properties of stainless steel, Fe-Al intermetallic compound layers were created by atmospheric-controlled induction-heating fine particle peening (AIH-FPP). The surface microstructure of the stainless steel treated with AIH-FPP was characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, and micro-Vickers hardness testing. In addition, the tribological properties were investigated by reciprocating ball-on-disk wear tests. When high-speed steel particles coated with thin aluminum layers were used as the shot particles, Fe-Al intermetallic compound layers were formed at the surfaces of the stainless steel with increased heating time during AIH-FPP. This is because aluminum was transferred from the shot particles, and the temperature at the treated surface increased as a result of a combustion synthesis reaction. When the heating temperature after FPP was increased, the transferred aluminum and nitrogen in the atmosphere reacted, which resulted in the formation of aluminum nitrides in addition to Fe-Al intermetallic compounds. The tribological properties of the stainless steel were improved by AIH-FPP since high-hardness layers were created. The results indicate that the formation of an Fe-Al intermetallic compound layer with high hardness by AIH-FPP is effective for modifying the tribological properties of the stainless steel within a relatively short span of time.

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“…To take advantage of these properties, dissimilar materials need to be combined and this poses certain problems for their joining. Haddadi (2014), Yin et al (2013) and Hibino (2010) demonstrated that high temperature is a crucial factor in the formation of brittle intermetallic compounds. Solid-state welding processes have been developed to avoid the formation of these brittle compounds.…”

Section: Introductionmentioning

confidence: 99%

Perpendicular ultrasonic joining of steel to aluminium alloy plates

Muñoz-Guijosa

Nanaumi

Ohtani

et al. 2017

Journal of Materials Processing Technology

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Standard and high strength steel plates were successfully joined to A2017 and A6061 aluminium plates by applying ultrasonic power perpendicular to the joint interface instead of tangentially, as in other ultrasonic joining methods Using a 2.9 mm diameter tip, cross tensile strengths of 281 N and 460 N were obtained when joining 0.5 mm thick A6061 plates to 0.5 mm thick commercial and high steel plates, respectively. When joining 0.5 mm thick A2017 plates, the cross tensile strengths were 343 N and 437 N, respectively. Temperature measured at less than 1mm from the joining interface did not exceed 135 • C in any case. The joining mechanisms and resulting joint characteristics are investigated and discussed, alongside parameters affecting the resulting joint performance. Under optimal joining conditions, the cross tensile tests and cross section observations revealed that material fracture resulted in plug failure. No intermetallic layer has been detected with SEM analysis. The joint strengths obtained under those conditions were the maximum attainable for the tip diameter used, provided that they correspond to the stress intensities required to propagate cracks in the aluminium. These results support the conclusion that this ultrasonic joining method, being operationally similar to the method used in resistance spot welding, and providing good performance joints, could be used successfully for high throughput indus-trial applications taking advantage of the available spot welding tooling and operational procedures, as tangential movement of the whole plate is not required.

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Estimation of Kinetic Parameters for Combustion Synthesis of FeAl Intermetallic Compound by Dipping Experiment of Fe Wire into Al Melt

Cited by 15 publications

References 17 publications

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

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

Formation of Fe–Al Intermetallic Compound Layer by AIH-FPP and its Effect on Tribological Properties of Stainless Steel

Perpendicular ultrasonic joining of steel to aluminium alloy plates

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