Effect of ball-milling time on mechanical and magnetic properties
Materials and Design
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Carbon nanotube reinforced FeCo alloys were produced by high energy ball-milling and spark plasma sintering (SPS). CNT 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.
AuthorsAlbaaji, AJ; CASTLE, E; Reece, MJ; Hall, JP; Evans, SL
- College Publications