Iron - based bulk amorphous alloys

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

Abstrakty

EN

Purpose: The paper presents a structure characterization, thermal and soft magnetic properties analysis of Fe-based bulk amorphous materials in as-cast state and after crystallization process. In addition, the paper gives some brief review about achieving, formation and structure of bulk metallic glasses as a special group of amorphous materials. 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 magnetic properties contained initial and maximum magnetic permeability, coercive force and magnetic after-effects measurements were determined by the Maxwell-Wien bridge and VSM methods. Findings: The X-ray diffraction and transmission electron microscopy investigations revealed that the studied as-cast bulk metallic glasses in form of ribbons and rods were amorphous. Two stage crystallization process was observed for studied bulk amorphous alloy. The differences of crystallization temperature between ribbons and rods with chosen thickness are probably caused by different amorphous structures as a result of the different cooling rates in casting process. The SEM images showed that studied fractures could be classified as mixed fractures with indicated two zones contained "river" and "smooth" areas. The changing of chosen soft magnetic properties (μr, Bs, Hc) obtained for samples with different thickness is a result of the non-homogenous amorphous structure of tested metallic glasses. The annealing process in temperature range from 373 to 773 K causes structural relaxation of tested amorphous materials, which leads to changes in their physical properties. The qualitative phase analysis from X-ray and TEM diffraction data enables the identification of a single phase of α-Fe for sample annealed at 823 K and a mixture of Fe2B, Fe3B and Fe23B6 and α-Fe phases for samples annealed at temperature of 873 and 923 K. Practical implications: The magnetic properties allow to classify the studied Fe-based glassy alloy for suitable material for electric and magnetic applications. These properties of 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, thermal and magnetic properties in function of sample thickness or annealing conditions.

Słowa kluczowe

EN

amorphous materials; bulk metallic glasses; thermal properties; magnetic properties; crystallization

PL

materiały amorficzne; szkła metaliczne; właściwości termiczne; właściwości magnetyczne; krystalizacja

• Wydawca: International OCSCO World Press
• Czasopismo: Archives of Materials Science and Engineering
• Rocznik: 2010
• Tom: Vol. 44, nr 1
• Strony: 5--27
• Opis fizyczny: Bibliogr. 68 poz.

Twórcy

autor

Babilas R.

autor

Nowosielski 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,

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