Structure and properties of selected Fe-based metallic glasses

• Autorzy: Nowosielski R. , Babilas R.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The paper presents a structure characterization, thermal and soft magnetic properties of Fe-based bulk amorphous materials in as-cast state and after crystallization process. Design/methodology/approach: The studies were performed on Fe72B20Si4Nb4 metallic glass in form of ribbons and rods. The amorphous structure of tested samples was examined by X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) methods. The thermal properties of the glassy samples were measured using differential thermal analysis (DTA) and differential scanning calorimetry (DSC). The soft magnetic properties examination of tested material contained magnetic permeability and magnetic after-effects measurements. Findings: The X-ray diffraction and transmission electron microscopy investigations revealed that the studied as-cast materials were amorphous. Broad diffraction halo could be seen for all tested samples, indicating the formation of a glassy phase with the diameters up to 2 mm. The fracture surface of rod samples appears to consist of two different zones, which probably inform about different amorphous structures of studied glassy materials. A two stage crystallization process was observed for studied alloy. The first stage of crystallization corresponding to the partial crystallization of á-Fe phase was followed by the formation of iron borides. It has shown that appropriate increasing of annealing temperature, significantly improved soft magnetic properties of examined alloy. Practical implications: The studied Fe-based metallic glass has good glass-forming ability and thermal stability for casting in form of ribbons and rods. The soft magnetic properties of studied alloy could be improved by applying the appropriate conditions of heat treatment (crystallization process). Originality/value: The applied investigation methods are suitable to determine the changes of structure in function of sample thickness and the improvement of its magnetic properties after crystallization in comparison with as-cast state.

Słowa kluczowe

EN

amorphous material; bulk metallic glasses; magnetic properties; crystallization

PL

materiał amorficzny; szkła metaliczne; właściwości magnetyczne; krystalizacja

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2009
• Tom: Vol. 37, nr 2
• Strony: 332--339
• Opis fizyczny: Bibliogr. 15 poz., rys., tabl.

Twórcy

autor

Nowosielski R.

autor

Babilas R.

• Division of Nanocrystalline and Functional Materials and Sustainable Pro-ecological Technologies, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland,

Bibliografia

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