Abstract
This study deals with the Fe65.5Cr4Mo4Ga4P12C5B5.5 ferromagnetic bulk amorphous alloy. XRD analysis showed an amorphous structure of the as-cast sample. The same method revealed that, after annealing at 973 K for τ=10 min, the sample displayed a crystalline structure with crystalline phases formed. The crystallization process of the alloy was examined by DTA analysis. It was shown that crystallization took place in the temperature range between 810 K and 860 K with the exo-maximum peak temperature at 846 K with a heating rate of 20 K·min-1. The method also showed that, at temperatures ranging from 753 K to 810 K, the alloy exhibited the properties of supercooled liquids. A correlation between heat-induced structural changes and magnetic properties of the alloy was determined by thermomagnetic measurements. Maximum magnetization M=3.7 Am2·kg-1 of the alloy was reached after its annealing at 733 K for τ=10 min. Upon annealing, the alloy exhibited a relaxed amorphous structure. Annealing the alloy above the crystallization temperature led to a decrease in bulk magnetization. After annealing at 973 K for τ=10 min, the bulk magnetization of the alloy was M'=0.45 Am2·kg-1. Accordingly, after crystallization and formation of new compounds, the magnetization of the alloy was decreased by a factor of about 7.7. The strength of the magnetic field applied during the measurements was H=10 kA·m-1. The samples were tested for changes in the microstructure and hardness of both the amorphous phase and the resulting crystalline phase.
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Bratislav Čukić Male, born in 1963. He is currently a lecturer in the field of Mechanical Engineering Materials and Technologies at the Technical College, Čačak, Serbia. His research area includes amorphous materials in ribbon form obtained by copper mold casting onto a disk, and ferromagnetic powders. He has published more than 15 papers in domestic journals and international conference proceedings.
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Čukić, B., Mitrović, N. & Maričić, A. Effect of heat treatment on structure and magnetic properties of Fe65.5Cr4Mo4Ga4P12C5B5.5 bulk amorphous alloy. China Foundry 14, 59–63 (2017). https://doi.org/10.1007/s41230-017-6114-2
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DOI: https://doi.org/10.1007/s41230-017-6114-2
Keywords
- bulk metallic glass
- X-ray diffraction analysis
- differential thermal analysis
- thermomagnetic properties
- magnetization
- hardness
- microstructure