Investigation of the mechanism of Fe<sub>2</sub>Al<sub>5</sub> powder into FeAl powder transformation

Khoshhal, Razieh; Hosseinzadeh, Ali

doi:10.1016/j.mprp.2018.06.001

Cited by 6 publications

(3 citation statements)

References 20 publications

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“…Furthermore, according to Equation ( 6), these adequate Fe react with previously created Fe 2 Al 5 to form FeAl. These FeAl and Fe 2 Al 5 alloy compositions have been shown to cause volume shrinkage, which results in many micro-cracks [37].…”

Section: Resultsmentioning

confidence: 99%

Understanding the Role of a Cr Transition Layer in the Hot-Salt Corrosion Behavior of an AlSi Alloy Coating

Liu

Chen

et al. 2022

Coatings

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The effect of a chromium (Cr) transition layer on the hot-salt corrosion behavior of an AlSi alloy coating was studied. Hot-salt corrosion experiments were performed at 650 °C and corrosion kinetic curves were plotted. The weight gain of the AlSi-coated samples increased to 0.89 mg/cm2 at 100 h and then decreased steadily to 0.77 mg/cm2 at 200 h. The weight of the AlSi-coated samples with the addition of a Cr transition layer increased immediately to 0.79 mg/cm2 at 20 h and then gradually increased to 0.85 mg/cm2 at 200 h. This Cr diffusion promoted the preferential creation of an Al2O3 layer, which effectively hindered the upward diffusion of Fe and also resulted in the production of a Cr2O3-SiO2 layer, which impeded the multi-scale salt mixture’s penetration. The Cr diffusion also caused a notable seal-healing effect, which healed the micro-pores. These oxidation and degradation reactions were considerably repressed by the high barrier properties of these oxide layers and the dense surface, resulting in the increased hot-salt corrosion resistance of the AlSi alloy coating. The current findings provide a feasible strategy for the design of a diffusion barrier layer of a thermal protective coating on martensitic stainless steel.

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Section: Resultsmentioning

confidence: 99%

Understanding the Role of a Cr Transition Layer in the Hot-Salt Corrosion Behavior of an AlSi Alloy Coating

Liu

Chen

et al. 2022

Coatings

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“…Gao et al [9] claim that Si can slow down exothermic reactions in the synthesis process and reduce the overall heat emitted from the system. Other researchers have also reported improved properties of iron aluminides in the presence of silicon [10][11][12][13].…”

Section: Introductionmentioning

confidence: 89%

Effect of Silicon on the Synthesis of Iron Aluminides from Elemental Powders

Khoshhal,

Seyed Vahid

2023

Silicon

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Iron aluminides have been receiving much attention due to their excellent properties such as light weight, high strength, oxidation resistance, and corrosion resistance. These types of materials are made in a variety of methods. Various types of additives such as Si, Cr, Ta, and Nb have been added to iron aluminides to improve their properties. Silicon is one of the most effective additives. There are no comprehensive studies that can prove the nal product of the Fe-Al powder system reactions in the presence of silicon. Therefore, equal molar ratios of Fe and Al powders were mixed with different amounts of Si to investigate the effect of silicon on the reactions of Fe-Al/Si powder system. The obtained samples were heat-treated at 950°C in an argon atmosphere. It has been found that the presence of silicon affects not only the type of iron aluminides and iron silicides produced but also the nal morphology.

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“…Then, molar ratios of 8%, 12.6%, and 20% moles) according to the amount of aluminum in each sample( of silicon (Pourian-chemical, < 5µ, > 99%) were added to the previous mixture. The amount of silicon has been selected based on the purpose of using both hypoeutectic and hypereutectic values of the binary diagram of silicon-aluminum [20]. A sample without Si was also considered a witness.…”

Section: Methodsmentioning

confidence: 99%

The effect of silicon on the oxidation behavior of iron aluminide produced using powder metallurgy

Khoshhal,

Masjedi,

Abad

2024

Silicon

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Iron aluminides are widely considered the most important materials due to their lightweight, low cost, easy sintering, and resistance to oxidation and sul dation. The presence of silicon in some alloys containing aluminum has had positive effects on their oxidation resistance. Few researchers have addressed the effect of silicon on the oxidation behavior of iron aluminide which is formed using elemental powders of Fe, Al, and Si. Therefore, in this research, the amount of silicon was changed and the effects of Si content on the oxidation behavior of iron aluminide were investigated. To achieve this goal, the elemental powders of Fe and Al (with a molar ratio of 1:1) along with different amounts of Si were pressed and sintered at 950°C. The samples were oxidized in air at temperatures of 600°C, 700°C, and 800°C, consequently. The ndings con rm that silicon up to a certain content can improve the oxidation resistance of iron aluminide. The morphology of the obtained phases is in uenced by the amount of silicon as well.

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Investigation of the mechanism of Fe₂Al₅ powder into FeAl powder transformation

Cited by 6 publications

References 20 publications

Understanding the Role of a Cr Transition Layer in the Hot-Salt Corrosion Behavior of an AlSi Alloy Coating

Understanding the Role of a Cr Transition Layer in the Hot-Salt Corrosion Behavior of an AlSi Alloy Coating

Effect of Silicon on the Synthesis of Iron Aluminides from Elemental Powders

The effect of silicon on the oxidation behavior of iron aluminide produced using powder metallurgy

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Investigation of the mechanism of Fe2Al5 powder into FeAl powder transformation

Cited by 6 publications

References 20 publications

Understanding the Role of a Cr Transition Layer in the Hot-Salt Corrosion Behavior of an AlSi Alloy Coating

Understanding the Role of a Cr Transition Layer in the Hot-Salt Corrosion Behavior of an AlSi Alloy Coating

Effect of Silicon on the Synthesis of Iron Aluminides from Elemental Powders

The effect of silicon on the oxidation behavior of iron aluminide produced using powder metallurgy

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Investigation of the mechanism of Fe₂Al₅ powder into FeAl powder transformation