Abstract
Fe1−xCox(x=0.1, 0.15, 0.2, 0.25, 0.3 and 0.5) powders were prepared by different milling-annealing treatments, and magnetic properties were investigated based on microstructure. Elevated heating times led to an increase in crystallite size, and decrease in lattice parameter. Up to 20min annealing, series 3 powders showed a decrease in microstrain 2.5 times more than series 2. The coercivity (HC) of 1-step milled and 60min annealed Fe50Co50 alloys decreased rigorously from 60 Oe to 19Oe due to strain relief (from 0.3% to 0.08%) and grain growth (from 30nm to 40nm). For series 2 alloys, the HC (up to 60min heating) increased from 72 Oe to 90 Oe, and decreased (up to 100min heating) to 70 Oe. Compared to series 1, extra milling treatment of series 2 causes an increase in magnetization saturation (MS) due to completion of alloying and grain refinement. Also, compared to series 2, extra annealing treatment for series 3 resulted in larger values of MS caused by stain relief.
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