Reactive synthesis of porous FeAlCr intermetallics with enhanced mechanical property and oxidation resistance by introducing yttrium borides

Zhang, Huibin; Wang, Long; Ma, Junliang; Yu, Hang; Xu, Shenghang; Hou, Guangya; He, Yuehui; Zheng, Guoqu

doi:10.1016/j.matchemphys.2021.124929

Cited by 8 publications

(3 citation statements)

References 46 publications

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“…During reactive synthesis, due to the small difference in melting points between Fe and Cr, the partially asymmetric diffusion between them is not significant, while the melting point of Al differs markedly from those of Fe and Cr, so that partially asymmetric diffusion takes place vigorously between Al and Fe/Cr near the melting point of Al. Therefore, the interstitial pores among the original powders can be aggrandized by the partially asymmetric diffusion induced by Al-related reactions [ 33 , 35 , 36 ]. Correspondingly, the porosity of porous Fe-Cr-Al alloys can be improved by increasing the Al content.…”

Section: Resultsmentioning

confidence: 99%

“…Low mold pressure and sintering temperature can reduce the mechanical properties of the sample, while an exceedingly high pressure and sintering temperature can lead to a sharp decline in the porosity of materials. In order to obtain materials with high porosity and well-developed sintering necks, we determined the appropriate pressure and sintering temperature based on previous experience [ 33 ]. The powder mixtures were pressed into bone-like compacts by mold pressing under a pressure of 200 MPa.…”

Section: Methodsmentioning

confidence: 99%

“…Up to now, both FeCrAl alloys and FeAl-based intermetallic compounds have been developed as porous materials for filtration applications [ 9 , 33 , 34 , 35 ]. This work aimed to design and conduct a comparative study for the high-temperature mechanical stabilities of porous ferrite FeCrAl and FeAlCr intermetallic when aged in an elevated-temperature environment.…”

Section: Introductionmentioning

confidence: 99%

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Study on Stability of Mechanical Properties for Porous Fe-Cr-Al Alloys after Long-Term Aging

Zhang

Gao

et al. 2022

Materials

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Nowadays, both the ferrite phase and B2-structured intermetallic in the Fe-Cr-Al alloy system are developed as porous materials, which have been further applied as high-temperature filter materials in industry. This work presents a comparative study of the mechanical properties of porous Fe20Cr5Al, Fe10Cr10Al and Fe10Cr20Al aged at 480 °C for 500 h. The changes in tensile strength, elongation and hardness were determined, and the microstructure changes as well as slight oxidation states of the aged samples were investigated. The results show that the precipitated Cr-rich phase in porous Fe20Cr5Al can increase the hardness and decrease the ductility, while intergranular oxidation can degrade the mechanical performance of the three porous Fe-Cr-Al materials. It is noted that porous Fe10Cr20Al exhibits relatively superior mechanical stability during long-term aging. Meanwhile, by introducing boron, the mechanical performance of the aged porous Fe-Cr-Al alloys can be stabilized since the possible internal oxidation of the exposed grain boundaries is inhibited.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study on Stability of Mechanical Properties for Porous Fe-Cr-Al Alloys after Long-Term Aging

Zhang

Gao

et al. 2022

Materials

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Fabrication of a Porous Fe–Al Intermetallic Alloy with Ultrahigh Open Porosity

Wang

et al. 2023

Adv Eng Mater

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Herein, a porous Fe–Al intermetallic material with ultrahigh open porosity is prepared via the multistep sintering process using a Fe–Al–Mn powder mixture as the raw material. The microstructure, phase composition, Mn sublimation, and open porosity of the sintered Fe–Al–Mn compacts are investigated. The compacts sintered at temperatures ≤700 °C are composed of the newly formed Fe/Mn‐based solid solutions, intermetallic phases, and the original elemental particles without the sublimation of Mn. The open porosities of the 650‐ and 700 °C‐sintered compacts are ≈39.83 and ≈47.19 vol%, respectively. After sintering at 1250 °C, Mn is rarely left in the porous body, and a single Fe–Al intermetallic phase with an even chemical composition is generated. The open porosity of the 1250 °C‐sintered compacts is ≈66.67 vol%, superior to other reported porous Fe–Al materials, and its strength is ≈22.5 MPa, which is competitive as well. This work may open a new strategy to design and optimize the high‐quality porous Fe–Al alloy in future.

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Performance assessments of porous FeCoNiCrAlx high-entropy alloys in high-temperature oxidation, carbonization and sulfidation atmospheres

Zhang

Guo

Wan

et al. 2023

Journal of Alloys and Compounds

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Reactive synthesis of porous FeAlCr intermetallics with enhanced mechanical property and oxidation resistance by introducing yttrium borides

Cited by 8 publications

References 46 publications

Study on Stability of Mechanical Properties for Porous Fe-Cr-Al Alloys after Long-Term Aging

Study on Stability of Mechanical Properties for Porous Fe-Cr-Al Alloys after Long-Term Aging

Fabrication of a Porous Fe–Al Intermetallic Alloy with Ultrahigh Open Porosity

Performance assessments of porous FeCoNiCrAlx high-entropy alloys in high-temperature oxidation, carbonization and sulfidation atmospheres

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