Journal of Mining and Metallurgy, Section B: Metallurgy 2012 Volume 48, Issue 2, Pages: 319-324
https://doi.org/10.2298/JMMB110719018M
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The precipitation of nanocrystalline structure in the joule heated Fe72Al5Ga2P11C6B4 metallic glasses
Mitrović N. (Joint Laboratory for Advanced Materials of SASA, Section for Amorphous Materials, Technical Faculty Čačak, Čačak)
Kane S. (School of Physics, D.A. University, Indore, India)
Roth S. (Leibniz Institute for Metallic Materials, IFW Dresden, Dresden, Germany)
Kalezić-Glišović A. (Joint Laboratory for Advanced Materials of SASA, Section for Amorphous Materials, Technical Faculty Čačak, Čačak)
Mickel C. (Leibniz Institute for Metallic Materials, IFW Dresden, Dresden, Germany)
Eckert J. (Leibniz Institute for Metallic Materials, IFW Dresden, Dresden, Germany)
In this study, the evolution of the nanostructure on dc Joule heated
Fe72Al5Ga2P11C6B4 metallic glass ribbons have been investigated. Heating
power per square area (PS) was ranging between 0.8 to 7.1 W/cm2 in order to
get various stages of relaxation or nanocrystallization. The crystallization
starts after applying PS ≈ 4.35 W/cm2 and the sample consist of residual
amorphous matrix, a magnetic crystalline component and also a non-magnetic
crystalline component (relative abundance of Fe in the crystalline phase is
about 35 %). XRD measurements show that crystalline samples after current
annealing consist of Fe3B, FeC, FeP and Fe3P compounds. On TEM micrograph a
broad distribution of shapes and sizes is noticed, the latter range from
about 60 to 350 nm, increasing by applied heating power. The decrease of the
electrical resistivity after each current annealing treatment is rather small
in comparison with other Fe-based amorphous alloys (only about 1.5 % for the
highest PS). Partial nanocrystallization leads to increase of coercive field
(from HC ≈ 7 A/m in the amorphous as-cast state up to 45 A/m) attributed to
precipitation of magnetically harder compounds (Fe3B and FeC).
Keywords: metallic glasses, thermal properties, nanocrystallization, transmission electron microscopy, Mössbauer spectra, electrical measurements, magnetic measurements