Structural analysis and magnetic characterization of ternary alloys (Co-Fe-Ni) synthesized by mechanical alloying

In this research, the synthesis of Co-Fe-Ni ternary alloys in different compositions (Co40Fe30Ni30, Co(30)Ee(40)Ni(30) and Co30Fe30Ni40), and their structural and magnetic properties were assessed. These alloys were milled during 7 h by mechanical alloying (MA), after of the milling time, the results of the structural analysis, shown three solids solutions obtained with fcc- structure (Co(FeNi)-fcc, Fe(CoNi)-fcc and Ni(FeCo)-fcc). As a consequence of the process of synthesis, the crystal size refinement was observed in all cases, meanwhile, the particle size increased due to the powders ductility. The magnetic properties at room temperature were studied to observe the saturation magnetization (Ms), before and after of the milling, the results of the un-milled powders were 140, 130 and 110 A m(2)/kg for Co40Fe30Ni30, Co(30)Ee(40)Ni(30) and Co30Fe30Ni40 respectively, after of mechanical alloying, the M-s increased to 162, 166 and 150 A m(2)/kg. On the other hand, the coercive field (H-c) values decreased drastically from 6.13 kA/m (similar to 77 Oe), 4.77 kA/m (similar to 60 Oe) and 5.57 kA/m (similar to 70 Oe) before of the milling process, to 0.365 kA/m (similar to 4.6 Oe), 0.296 kA/m (similar to 3.7 Oe) and 0.306 kA/m (similar to 3.8 Oe) after the milling for Co40Fe30Ni30, Co(30)Ee(40)Ni(30) and Co30Fe30Ni40, respectively. (C) 2020 The Author(s). Published by Elsevier B.V.