Journal
METALS
Volume 11, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/met11111679
Keywords
ball milling; X-ray diffraction; nanocrystalline; semi-hard; thermal stability
Funding
- University of Girona [PONT2020-01]
- Spanish Mineco [PID2020-115215RB-C22]
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The nanocrystalline Fe70Ni12B16Si2 (at.%) alloy was prepared by mechanical alloying and showed the formation of body-centered cubic and faced-centered cubic solid solution phases during high-energy milling. Annealing at 650℃ improved the magnetic properties by reducing coercivity and increasing saturation magnetization.
The nanocrystalline Fe70Ni12B16Si2 (at.%) alloy was prepared by mechanical alloying (MA) of elemental powders in a high-energy planetary ball mill. Phase evolution, microstructure, thermal behavior and magnetic properties were investigated. It was found that a body-centered cubic structured solid solution started to form after 25 h milling and a faced-centered cubic structure solid solution started to form after 50 h of milling; its amount increased gradually with increasing milling time. The BCC and the FCC phases coexisted after 150 h of milling, with a refined microstructure of 13 nm and a 10 nm crystallite size. The as-milled powder was annealed at 450 & DEG;C and 650 & DEG;C and then investigated by vibrating sample magnetometry (VSM). It was shown that the semi-hard magnetic properties are affected by the phase transformation on annealing. The saturation magnetization decreases after annealing at 450 & DEG;C, whereas annealing at 650 & DEG;C improves the magnetic properties of 150 h milled powders through the reduction of coercivity from 109 Oe to 70 Oe and the increase in saturation magnetization.
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