Effect of mechanical milling and cold pressing on co power

Show simple item record Bolokang, AS Phasha, MJ Motaung, DE Bhero, S 2013-03-25T06:54:34Z 2013-03-25T06:54:34Z 2012
dc.identifier.citation Bolokang, AS, Phasha, MJ, Motaung, DE and Bhero, S. 2012. Effect of mechanical milling and cold pressing on co power. Journal of Metallurgy, pp 1-7 en_US
dc.description Copyright: 2012 Hindawi Publishing Corporation. Published in Journal of Metallurgy, pp 1-7. doi:10.1155/2012/290873 en_US
dc.description.abstract Cold pressing (CP) of the amorphous-like Co powder suppressed most of the XRD peaks, in particular the peak along (100) plane. The DSC curve of unmilled CP Co powder has shown a distinct sharp exothermic peak at 615◦C. Upon annealing at 700◦C, only the FCC phase with lattice parameter of 3.51 °A was detected by XRD. Our results implied that the exotherm at 615◦C corresponds to compaction-pressure-assisted HCP to FCC first-order phase transition. The XRD analysis of 30 h milled powder revealed for the first time the FCC phase with a = 3.80 A°. However, due to presence of (100) and (210) peaks, this phase is thought to be FCT with lattice parameters a = b = 3.80 and c = 3.07 A°. Consequently, the high-energy milling carried out in the current work induced for the first time HCP to FCT transition in Co. Upon CP of milled powder, the lattice parameter a shrunk from 3.80 to 3.75 A°. However, during annealing of the CP milled Co powder at 750◦C, the FCT to FCC transition occurred, yielding the FCC phase with a = 3.51 A°. en_US
dc.language.iso en en_US
dc.publisher Hindawi Publishing Corporation en_US
dc.relation.ispartofseries Workflow;10202
dc.subject Cold pressing en_US
dc.subject CP en_US
dc.subject Mechanical milling en_US
dc.subject Magnetic recording en_US
dc.title Effect of mechanical milling and cold pressing on co power en_US
dc.type Article en_US

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