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Investigation the Correlation Between Nanocrystallization and Consolidation Mechanisms and Their Effect on Magnetic Properties of Bulk Finemet Type Alloys
, Ph.D. Dissertation Sharif University of Technology ; Madaah Hosseini, Hamid Reza (Supervisor) ; Davami, Parviz (Supervisor)
Abstract
Finemet soft magnetic alloys in the form of toroidally winded ribbons are not suitable for industrial applications where a large volume of magnetic materials is required. Production of Finemet bulk alloy by powder metallurgy techniques is an applicable method to produce complex component with isotropic magnetic properties which are the same as ribbons. In this research, Finemet bulk magnetic alloy with composition of has been produced by consolidation of amorphous powders obtained by milling of melt-spun ribbons. At the all stages, the structure and magnetic properties were studied using X-ray diffraction, differential scanning calorimetry, transmission electron microscopy, scanning...
Fabrication of FINEMET bulk alloy from amorphous powders by spark plasma sintering
, Article Powder Technology ; Volume 289 , 2016 , Pages 163-168 ; 00325910 (ISSN) ; Madaah Hosseini, H. R ; Davami, P ; Sarafidis, C ; Sharif University of Technology
Elsevier
Abstract
Finemet bulk soft magnetic alloy was fabricated by spark plasma sintering of the milled ribbons. The amorphous melt-spun ribbons were milled for 36min by high energy vibrational mill and then sieved to separate particles smaller than 125μm. The size distribution of particles was determined by a laser diffraction particle size analyzer. Spark plasma sintering was carried out at super-cooled liquid region for short times of 7 and 21min. The structure of bulk samples was characterized using X-ray diffraction, scanning electron microscopy, differential scanning calorimetry and transmission electron microscopy techniques. The magnetization and coercivity of samples were measured using SQUID...