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• W2133075144 abstract "Composite strengthening was attempted to improve the mechanical strength andtoughness of the brittle near equiatomic Fe-Co alloy. The matrix alloy chosen for thisresearch falls in the Fe-(30-50) Co group, which are known for their highest saturationinduction (B-sat) and Curie temperature among the commercial soft magnetic alloys. Thereinforcements, which exhibited a wide range of aspect ratios, included SiC particulates, SiCwhiskers and carbon nanotubes (CNTs). In order to minimize the interfacial reaction betweenthe reinforcements and the Fe-50Co alloy (matrix) and to realise higher compact density,spark plasma sintering (SPS) was selected for rapid compaction of materials. Reinforcementswere coated using electroless deposition with Ni-P, copper and cobalt to modify theinterfacial chemistry and thickness, and hence the final properties of the composites.A comprehensive study on the sintering variables found, within the range ofexamination and under constant heating and cooling rates, the optimum maximumtemperature, soaking time and mechanical pressure of 900oC, 2-5 minutes and 80 MPa torapidly consolidate the Fe- 50Co alloy to near-theoretical density. The volume fraction andsize of the ordered regions in the monolithic alloy and hence the magnetic properties, weresensitive to the heating rate, cooling rate, temperature at which the mechanical pressure wasapplied and removed and post heat treatments.The influence of reinforcement coatings on the wetting characteristics, and in turn theproperties, was compared using SiC particulate Fe-50Co composites. The introduction ofbare and coarse (20 μm) SiC particulates negatively affected both magnetic and mechanicalproperties. Electroless Co coating of particulates improved both the flexural properties andmagnetic characteristics such as permeability and coercivity by promoting the formation ofnarrower interfaces and better bonding.The addition of bare and coated whiskers in Fe-Co alloys enhanced densification andgrain growth of the matrix. Copper coating over whiskers was found to be not helpful inrealising uniform dispersion, whereas Co and Ni-P coating aided to achieve uniformdispersion of whiskers in the matrix. The amorphous Ni-P coating on whiskers wasnanocrystallised during the rapid sintering process and resulted in a material with highlyimproved mechanical strength and ductility in comparison to the monolithic and otherwhisker reinforced composite materials.A novel attempt to prepare bulk Fe based alloy composites reinforced with CNTs wasalso undertaken. Both soft magnetic and mechanical property enhancements were observed incomposites with lower vol% of CNTs (i.e. < 1.5%, in the range of examination up to 10%)due to the improvement of compact density by CNTs. An increase in the CNT vol% produceda negative effect on saturation induction and mechanical properties due to the agglomerationof CNTs and reduction in compact density. SPS helped to retain the structural integrity ofCNTs during processing. Electroless Ni-P coating over the CNTs helped to reduce thestructural damage of CNTs during processing and to improve the mechanical strength andductility at a marginal cost of saturation induction, in comparison to the monolithic compactsand bare CNT reinforced composites.To date accurate temperature assessment of the compact in the SPS die has beendifficult due to the remote position of the pyrometer within the body of the die. It has beenfound that the ferromagnetic Curie transition can be successfully employed to calibrate SPSpyrometer during processing." @default.
• W2133075144 created "2016-06-24" @default.
• W2133075144 creator A5031245736 @default.
• W2133075144 date "2014-01-01" @default.
• W2133075144 modified "2023-09-28" @default.
• W2133075144 title "Development of Fe-50Co alloy and its compositesby spark plasma sintering" @default.
• W2133075144 hasPublicationYear "2014" @default.
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