Formation, Time–Temperature–Transformation curves and magnetic properties of FeCoNbSiBP metallic glasses
Articolo
Data di Pubblicazione:
2015
Abstract:
Starting from the Fe52Co23Nb4Si5B16alloy 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.%.
Tipologia CRIS:
03A-Articolo su Rivista
Elenco autori:
G. Fiore;M. Baricco;L. Martino;M. Coisson;P. Tiberto;F. Vinai;L. Battezzati
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