Starting from the Fe52Co23Nb4Si5B16 alloy having good soft magnetic properties and tendency to amorphization, the addition of P, a glass former in Fe-based alloys, is explored up to 4 at.%. The alloys were rapidly solidified by means of planar flow casting and have been characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC) and high temperature differential thermal analysis (HT DSC). The crystallization mechanism has been studied as a function of temperature: it involves primary formation of a bcc phase at low P content and becomes eutectic at 4% P. A remarkable achievement are Time–Temperature–Transformation (TTT) diagrams for primary crystallization obtained by DSC. Magnetisation measurements as a function of temperature in parallel with thermal analysis revealed details of the crystallization sequence. The magnetic softness of alloys has been shown with hysteresis cycles. The use of P appears favourable to amorphization, thermal and magnetic properties up to 2 at.%.

Formation, Time-Temperature-Transformation curves and magnetic properties of FeCoNbSiBP metallic glasses / Fiore, G; Baricco, M; Martino, L; Coisson, Marco; Tiberto, PAOLA MARIA; Vinai, Franco; Battezzati, L.. - In: JOURNAL OF ALLOYS AND COMPOUNDS. - ISSN 0925-8388. - 619:(2015), pp. 437-442. [10.1016/j.jallcom.2014.08.260]

Formation, Time-Temperature-Transformation curves and magnetic properties of FeCoNbSiBP metallic glasses

COISSON, MARCO;TIBERTO, PAOLA MARIA;VINAI, FRANCO;
2015

Abstract

Starting from the Fe52Co23Nb4Si5B16 alloy having good soft magnetic properties and tendency to amorphization, the addition of P, a glass former in Fe-based alloys, is explored up to 4 at.%. The alloys were rapidly solidified by means of planar flow casting and have been characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC) and high temperature differential thermal analysis (HT DSC). The crystallization mechanism has been studied as a function of temperature: it involves primary formation of a bcc phase at low P content and becomes eutectic at 4% P. A remarkable achievement are Time–Temperature–Transformation (TTT) diagrams for primary crystallization obtained by DSC. Magnetisation measurements as a function of temperature in parallel with thermal analysis revealed details of the crystallization sequence. The magnetic softness of alloys has been shown with hysteresis cycles. The use of P appears favourable to amorphization, thermal and magnetic properties up to 2 at.%.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11696/29365
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