Mechanical and magnetic properties of spark plasma sintered soft magnetic FeCo alloy reinforced by carbon nanotubes

Albaaji, Amar J.; Castle, Elinor G.; Reece, Mike; Hall, Jeremy Peter; Evans, Samuel Lewin

doi:10.1557/jmr.2016.372

Cited by 5 publications

(5 citation statements)

References 36 publications

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“…Therefore, improving the ductility and toughness of increase in ductility. The ductility of the samples sintered at 1100 ºC without dwelling is higher than the recently reported ductility of FeCo alloy composites prepared by spark plasma sintering under 80 MPa pressure, at 900 ºC for 3 min [29,33].…”

Section: Mechanical Propertiescontrasting

confidence: 67%

“…Samples sintered under 80 MPa in previous work [29], achieved near-full densification to a relative density of 99.1 %. However, it has been shown here that it is possible to obtain a relative density of 99.4 % at a significantly lower compaction pressure of 50 MPa.…”

Section: Effect Sps Parameters On Densification and Structurementioning

confidence: 77%

“…However, it has been shown here that it is possible to obtain a relative density of 99.4 % at a significantly lower compaction pressure of 50 MPa. This could be due to the fact that the sintering pressure was applied earlier on in the sintering program in comparison to conditions used in [29]. The applied pressure leads to better electrical and thermal contact between the particles during sintering and also enhances the already available sintering mechanisms in free sintering, including; grain boundary diffusion, lattice diffusion, and viscous flow [28].…”

Section: Effect Sps Parameters On Densification and Structurementioning

confidence: 99%

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Enhancement in the elongation, yield strength and magnetic properties of intermetallic FeCo alloy using spark plasma sintering

et al. 2017

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Equiatomic FeCo alloys were densified using spark plasma sintering (SPS). Using a constant 50 MPa pressure, the sintering temperature and dwell times for the SPS process were optimised for different heating rates (50, 100, 300 ºC.min-1). All samples used in this optimisation process were analysed in terms of their mechanical and magnetic properties. Interestingly, for all heating rates, FeCo samples sintered at the highest temperatures (1100 ºC) without dwelling exhibited an increased tensile yield strength combined with an improvement in the elongation to fracture. This occurred despite the microstructural coarsening observed at this sintering temperature, which decreased the ultimate tensile strength. Improved grain boundary bonding in the samples sintered at the highest sintering temperature led to a suppression of intergranular fracture; something previously considered to be inherent to all equiatomic FeCo alloy structures. An optimum combination of mechanical (ultimate tensile strength = 400 MPa, yield strength = 340 MPa and strain to failure = 3.5 %) and magnetic (saturation induction (Bsat) of 2.39 T and coercivity (Hc) of 612 A.m-1) properties was achieved by sintering to 1100 ºC using a relatively slow heating rate of 50 ºC.min-1 with no dwell time.

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Section: Mechanical Propertiescontrasting

confidence: 67%

Section: Effect Sps Parameters On Densification and Structurementioning

confidence: 77%

Section: Effect Sps Parameters On Densification and Structurementioning

confidence: 99%

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Enhancement in the elongation, yield strength and magnetic properties of intermetallic FeCo alloy using spark plasma sintering

et al. 2017

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“…% CNT composite as compare to monolithic FeCo alloy with further extending in ball-milling time. It was found that the uniform dispersed CNTs in FeCo alloy to cause an increase in saturation induction with reduced coercivity, due to improve densification and formation nanocrystallite ordered structure [28].…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Effect of ball-milling time on mechanical and magnetic properties of carbon nanotube reinforced FeCo alloy composites

et al. 2017

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Carbon nanotubes (CNTs) reinforced FeCo alloys were produced by high energy ball-milling and spark plasma sintering (SPS). CNTs distribution in the FeCo alloy was gradually improved as ball-milling time increased, with a uniform dispersion achieved after 6 h ballmilling. Tensile tests demonstrated that, as the ball-milling time increased, the yield strength increased in the composites; a maximum 50 % relative increase in tensile strength due to the addition of CNTs was achieved after 1 h ball-milling, which then decreased with further ballmilling. The elongation to fracture was significantly increased after 1 h ball-milling and then decreased with further ball-milling. SEM results show a patch of dimples in the fracture surface of the composite, indicating improved ductility due to CNTs. The coercivity was increased with increased ball-milling time, while the saturation induction showed a peak value after 1 h of ball-milling and then decreased with further ball-milling. Raman spectra of the composite indicated that no serious damage had been imparted to the CNTs during ballmilling.

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“…2 SPS recently used for sintering FeCo alloy composites, showing an advantage for maintaining the nanostructure features and significant improvement in mechanical properties. [3][4][5] Newly, the mechanical properties of FeCo alloy were significantly improved by SPS at certain sintering conditions. 6 Therefore, the current study aims to evaluate the magnetic properties of FeCo alloy sintered at different sintering conditions in order to optimise the best sintering conditions for the best combination of magnetic and mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Influence of spark plasma sintering parameters on magnetic properties of FeCo alloy

et al. 2017

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Equiatomic FeCo alloys with average particle size of 24 μm were sintered using spark plasma sintering (SPS) system at sintering temperatures of 1100, 800, and 850 °C for heating rates 50, 100, 300 °C/min by applying pressure of 50 MPa instantly at room temperature for sintering time of 5 and 15 minutes. The highest saturation induction was achieved at SPS conditions of 50 MPa, 50 °C/min, 1100 °C, without dwelling, of value 2.39 T. The saturation induction was improved with extending sintering time, the coercivity was higher in samples sintered at a fast heating rate in comparison to the slowest heating rate.

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Mechanical and magnetic properties of spark plasma sintered soft magnetic FeCo alloy reinforced by carbon nanotubes

Abstract: Abstract

Cited by 5 publications

References 36 publications

Enhancement in the elongation, yield strength and magnetic properties of intermetallic FeCo alloy using spark plasma sintering

Enhancement in the elongation, yield strength and magnetic properties of intermetallic FeCo alloy using spark plasma sintering

Effect of ball-milling time on mechanical and magnetic properties of carbon nanotube reinforced FeCo alloy composites

Influence of spark plasma sintering parameters on magnetic properties of FeCo alloy

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