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

Albaaji, Amar J., Castle, Elinor G., Reece, Mike J., Hall, Jeremy P. and Evans, Samuel L. 2017. Effect of ball-milling time on mechanical and magnetic properties of carbon nanotube reinforced FeCo alloy composites. Materials & Design 122 , pp. 296-306. 10.1016/j.matdes.2017.02.091

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Abstract

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 ball-milling. 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 ball-milling. 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 ball-milling.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Uncontrolled Keywords: Ball milling; Carbon nanotube; Spark plasma sintering
Publisher: Elsevier
ISSN: 0264-1275
Date of First Compliant Deposit: 10 August 2017
Date of Acceptance: 28 February 2017
Last Modified: 28 Jun 2019 15:16
URI: http://orca.cf.ac.uk/id/eprint/102932

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