Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10155532 | Journal of Non-Crystalline Solids | 2018 | 11 Pages |
Abstract
In this study, the structural, thermal and magnetic characteristics of Fe75-xTa5Si10C10+x (xâ¯=â¯0, 5, 10) powders processed by mechanical alloying (MA) were investigated. The X-ray diffraction (XRD) indicated that by increasing the level of carbon, the structural refinement and lattice strain of the nanocrystalline Fe-based solid solution formed in the early stages of milling are enhanced. Furthermore, quantitative XRD analyses demonstrated that the glass forming ability (GFA) is remarkably improved by increasing the amount of carbon, where the percentage of amorphous phase increases from 56% for xâ¯=â¯0 to 98% for xâ¯=â¯10 after 120â¯h of milling. In addition, thermodynamic calculations, based on the extended Miedema's model, showed that the driving force for the glass formation increases with the concentration of carbon. Also, thermal analyses demonstrated that both the glass transition (Tg) and the onset of the crystallization (Tx) temperatures increase with the content of carbon, suggesting an enhanced thermal stability of the glassy phase. Additionally, the extension of the supercooled liquid region for the alloys with xâ¯=â¯5 and 10 reached a large value of 75 and 78â¯K, respectively, manifesting a high thermal stability of their supercooled liquid. Magnetic measurements showed that the soft magnetic behavior of the powders milled for 120â¯h is improved by increasing the level of carbon in terms of a decrease in coercivity (Hc) from 3.7 kA/m for xâ¯=â¯0 to 2.1 kA/m for xâ¯=â¯10. The evolution of the magnetic properties with annealing temperature reflected that the alloy with xâ¯=â¯10 displays a minimum Hc of 1.2 kA/m after annealing at 673â¯K.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Ehsan Bahadori Yekta, Amir Hossein Taghvaei, Shahriyar Sharafi,