TY - JOUR
T1 - Nanocrystallisation of an Fe44.5Co44.5Zr7 B4 amorphous magnetic alloy
AU - Li, H. F.
AU - Laughlin, D. E.
AU - Ramanujan, R. V.
PY - 2006/4/1
Y1 - 2006/4/1
N2 - The crystallisation of amorphous Fe44.5Co44.5Zr 7 B4 was investigated using DSC, electrical resistivity, TEM, HRTEM, CBED and VSM. Melt-spun amorphous Fe Fe44.5Co 44.5Zr7 B4 crystallised by the primary crystallisation mode: the DSC results showed two exothermal peaks during heating. The electrical resistivity dropped sharply during the crystallisation event, which was consistent with DSC characterisation. From TEM, HRTEM and CBED results, primary crystallisation products which appeared to be clusters of crystals were found to be single crystal precipitates; these crystals formed in a compact dendritic morphology. Direct measurement of nucleation density and volume fraction was carried out using TEM analysis. The nucleation density was found to be high even in the absence of copper addition. The crystal growth was slow when the average size reached around 30?nm; this resulted in a stable nanocrystalline structure. The soft magnetic properties were improved after nanocrystallisation, the magnetic properties were related to the crystalline volume fraction and the Herzer model.
AB - The crystallisation of amorphous Fe44.5Co44.5Zr 7 B4 was investigated using DSC, electrical resistivity, TEM, HRTEM, CBED and VSM. Melt-spun amorphous Fe Fe44.5Co 44.5Zr7 B4 crystallised by the primary crystallisation mode: the DSC results showed two exothermal peaks during heating. The electrical resistivity dropped sharply during the crystallisation event, which was consistent with DSC characterisation. From TEM, HRTEM and CBED results, primary crystallisation products which appeared to be clusters of crystals were found to be single crystal precipitates; these crystals formed in a compact dendritic morphology. Direct measurement of nucleation density and volume fraction was carried out using TEM analysis. The nucleation density was found to be high even in the absence of copper addition. The crystal growth was slow when the average size reached around 30?nm; this resulted in a stable nanocrystalline structure. The soft magnetic properties were improved after nanocrystallisation, the magnetic properties were related to the crystalline volume fraction and the Herzer model.
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U2 - 10.1080/14786430500380142
DO - 10.1080/14786430500380142
M3 - Article
AN - SCOPUS:33645100956
SN - 1478-6435
VL - 86
SP - 1355
EP - 1372
JO - Philosophical Magazine
JF - Philosophical Magazine
IS - 10
ER -