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

Different volume fractions (0.5–4.5 vol%) of carbon nanotubes (CNTs) were used to reinforce a binary Fe50Co soft magnetic alloy. The first method for dispersion involved dry mixing and ball milling of the powder, while the second included wet mixing in dimethylformamide under ultrasonic agitation, d...

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Bibliographic Details
Published in:Journal of materials research 2016-11, Vol.31 (21), p.3448-3458
Main Authors: Albaaji, Amar J., Castle, Elinor G., Reece, Mike J., Hall, Jeremy P., Evans, Sam L.
Format: Article
Language:English
Subjects:
Alloys
Analysis
Applied and Technical Physics
Ball milling
Biomaterials
Carbon
Carbon fiber reinforcement
Carbon nanotubes
Cobalt
Composite materials
Crack initiation
Drying
Ductility
Elongation
Grain boundaries
Inorganic Chemistry
Intermetallic compounds
Magnetic fields
Magnetic properties
Materials Engineering
Materials research
Materials Science
Mechanical properties
Microscopy
Nanotechnology
Nanotubes
Plasma sintering
Scanning electron microscopy
Silicon carbide
Sintering (powder metallurgy)
Studies
Temperature
Tensile strength
Tensile tests
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Summary:Different volume fractions (0.5–4.5 vol%) of carbon nanotubes (CNTs) were used to reinforce a binary Fe50Co soft magnetic alloy. The first method for dispersion involved dry mixing and ball milling of the powder, while the second included wet mixing in dimethylformamide under ultrasonic agitation, drying and then dry ball milling. The powders were consolidated using spark plasma sintering. Tensile test and SEM analyses were performed to characterize the mechanical properties and the fracture surface of the sintered materials. The best magnetic and mechanical properties were achieved using the first method. A maximum enhancement in tensile strength of around 20% was observed in the 0.5 vol% CNT composite with improved elongation compared to the monolithic Fe50Co alloy. In addition, the magnetic properties were enhanced by adding CNTs up to 1 vol%, and an improvement in densification was observed in composites up to 1.5 vol% CNT with respect to monolithic Fe50Co alloy.
ISSN:0884-2914
2044-5326
DOI:10.1557/jmr.2016.372