Effect of pressure on pore structure of porous FeAl intermetallics

Gao, Haiyan; He, Yuehui; Shen, Peizhi; Jiang, Yao; Liu, C.T.

doi:10.1016/j.apt.2015.03.002

Cited by 28 publications

(8 citation statements)

References 22 publications

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“…The combination of these properties make intermetallics suitable for industrial applications in automotive industry and energy generation [2][3][4]. In particular, Al-based intermetallic compounds attract much attention due to the outstanding properties of low density, high specific strength, excellent corrosion and oxidation resistance at high temperatures [5,6], including Ti-Al, Fe-Al, Nb-Al, Ni-Al and TiAl-Nb [7][8][9][10][11]. Recently, Ti-Al intermetallics have been fabricated into porous materials by vacuum sintering technique from elemental powders, and the durability is highly depend on its pore structures and pore-size distribution, which enable them good candidate for applications in filtration, solid-liquid separate and heat insulation [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution and Pore Formation Mechanism of Porous TiAl3 Intermetallics via Reactive Sintering

Jiao

Wang

Feng

et al. 2017

Acta Metall. Sin. (Engl. Lett.)

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Porous TiAl 3 intermetallics were fabricated through vacuum reactive sintering from Ti-75Al at.% elemental powder mixture. The phase compositions, expansion behaviors, pore characteristics and microstructure evolution of TiAl 3 intermetallics were investigated, and the pore formation mechanism was also proposed. It was found that the actual temperature of compacts showed an acute climb from 668 to 1244°C in 166s, while the furnace temperature maintained the linear growth of 5°C/min, which indicated that an obvious thermal explosion (TE) reaction occurred during sintering, and only single-phase TiAl 3 intermetallic was synthesized in TE products. The open porosity increased from 22.2 (green compact) to 32.8% after reactive diffusion sintering at 600°C and rised to 58.7% after TE, then decreased to 51.2% after high-temperature homogenization at 1100°C. Therefore, TE reaction is the dominated pore formation mechanism of porous TiAl 3 intermetallics. The pore evolution in porous TiAl 3 intermetallics occurred by the following mechanisms: certain intergranular pores remained among powder particles of green compact, then low-temperature sintering resulted in a further increase in porosity due to the Kirkendall effect. Moreover, TE reaction gave rise to a dramatic volume expansion because of the rapid increase in temperature, and high-temperature sintering caused densification and a slight shrinkage.

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Section: Introductionmentioning

confidence: 99%

Microstructure Evolution and Pore Formation Mechanism of Porous TiAl3 Intermetallics via Reactive Sintering

Jiao

Wang

Feng

et al. 2017

Acta Metall. Sin. (Engl. Lett.)

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“…6 d). Upon the reaction between aluminum and iron, pores form in locations of aluminum particles, if aluminum is confined in a certain volume, owing to Kirkendall effect [29][30][31]. As aluminum plays a role of the matrix surrounding particles of the metallic glass in Al-20 vol.% Fe66Cr10Nb5B19 composites, we do not observe porosity related to Kirkendall effect.…”

Section: Phase Composition and Microstructure Of Composites Obtained By Sps Of Al-20 Vol% Fe66cr10nb5b19 And Al-50 Vol% Fe66cr10nb5b19 Pomentioning

confidence: 52%

Interaction between Fe66Cr10Nb5B19 metallic glass and aluminum during spark plasma sintering

Dudina

Bokhonov

Batraev

et al. 2021

Materials Science and Engineering: A

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In the area of metal matrix composites, novel reinforcing options are currently being evaluated. Particles of amorphous alloys present an interesting possibility to reinforce soft metals. In the present work, the interaction between Fe66Cr10Nb5B19 metallic glass and aluminum during Spark Plasma Sintering (SPS) was studied for the first time. In order to trace the phase and microstructural changes upon sintering, mixtures containing 20 vol.% and 50 vol.% of metallic glass were subjected to SPS at 500-570 ºC. After SPS at 500 ºC, no reaction layer between the metallic glass particles and aluminum was observed. After SPS at 570 ºC, a reaction layer containing Fe2Al5 and FeAl3 formed around the Fe-based cores. The Vickers hardness of composites obtained from mixtures containing 20 vol. % Fe66Cr10Nb5B19 at 540 ºC was 75 HV and increased to 280 HV after sintering at 570 ºC due to the formation of thicker reaction layers at the interface.The hardness of the composite sintered from the mixture containing 20 vol. % Fe66Cr10Nb5B19 at 570 ºC was between the values predicted by Reuss and Voigt models.Comparison of results of SPS of the powder mixtures with those of SPS of a precompacted pellet and electric current-free annealing suggests that local heating at the interface caused by interfacial resistance may be an important factor influencing the reaction advancement at the interface and the formation of Al-containing intermetallics.

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“…The formation of pores in the metallic systems during heat treatment due to the Kirkendall effect is a known phenomenon [23][24][25]. When an Al matrix composite with embedded Cu particles was heat-treated, pores formed in the Cu particles due to the Kirkendall effect [23].…”

Section: Resultsmentioning

confidence: 99%

“…When an Al matrix composite with embedded Cu particles was heat-treated, pores formed in the Cu particles due to the Kirkendall effect [23]. When aluminum is surrounded by iron, pores form in the locations of aluminum particles [24,25]. Studying the Kirkendall effect in Al-Fe 66 Cr 10 Nb 5 B 19 requires carrying out model experiments under conditions that are not necessarily optimal for making composites with attractive mechanical properties.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and Mechanical Properties of Composites Obtained by Spark Plasma Sintering of Al–Fe66Cr10Nb5B19 Metallic Glass Powder Mixtures

Dudina

Bokhonov

Batraev

et al. 2021

Metals

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At present, metallic glasses are evaluated as alternative reinforcements for aluminum matrix composites. These composites are produced by powder metallurgy via consolidation of metallic glass-aluminum powder mixtures. In most studies, the goal has been to preserve the glassy state of the reinforcement during consolidation. However, it is also of interest to track the structure evolution of these composites when partial interaction between the matrix and the metallic glass is allowed during sintering of the mixtures. The present work was aimed to study the microstructure and mechanical properties of composites obtained by spark plasma sintering (SPS) of Al-20 vol.% Fe66Cr10Nb5B19 metallic glass mixtures and compare the materials, in which no significant interaction between the matrix and the Fe-based alloy occurred, with those featuring reaction product layers of different thicknesses. Composite materials were consolidated by SPS at 540 and 570 °C. The microstructure and mechanical properties of composites obtained by SPS and SPS followed by forging, composites with layers of interfacial reaction products of different thicknesses, and metallic glass-free sintered aluminum were comparatively analyzed to conclude on the influence of the microstructural features of the composites on their strength.

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Effect of pressure on pore structure of porous FeAl intermetallics

Cited by 28 publications

References 22 publications

Microstructure Evolution and Pore Formation Mechanism of Porous TiAl3 Intermetallics via Reactive Sintering

Microstructure Evolution and Pore Formation Mechanism of Porous TiAl3 Intermetallics via Reactive Sintering

Interaction between Fe66Cr10Nb5B19 metallic glass and aluminum during spark plasma sintering

Microstructure and Mechanical Properties of Composites Obtained by Spark Plasma Sintering of Al–Fe66Cr10Nb5B19 Metallic Glass Powder Mixtures

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