Preparation, thermal stability, and magnetic properties of Fe---Co---Zr---Mo---W---B bulk metallic glass |
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Authors: | D.Y. Liu W.S. Sun A.M. Wang H.F. Zhang Z.Q. Hu |
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Affiliation: | Shenyang National Laboratory for Materials Science, Chinese Academy of Sciences, Institute of Metal Research, Shenyang 110006, PR China |
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Abstract: | A bulk metallic glass (BMG) cylinder of Fe60Co8Zr10Mo5W2B15 with a diameter of 1.5 mm was prepared by copper mould casting of industrial raw materials. The amorphous state and the crystallization behavior were investigated by X-ray diffraction (XRD). The thermal stability parameters, such as glass transition temperature (Tg), crystallization temperature (Tx), supercooled liquid region (ΔTx) between Tg and Tx, and reduced glass transition temperature Trg (Tg/Tm) were measured by differential scanning calorimetry (DSC) to be 891, 950, 59 K, and 0.62, respectively. The crystallization process took place through a single stage, and involved crystallization of the phases -Fe, ZrFe2, Fe3B, MoB2, Mo2FeB2, and an unknown phase, as determined by X-ray analysis of the sample annealed for 1.5 ks at 1023 K, 50 K above the DSC peak temperature of crystallization. Mössbauer spectroscopy was studied for this alloy. The spectra exhibit a broadened and asymmetric doublet-like structure that indicated paramagnetic behavior and a fully amorphous structure. -Fe was found in the amorphous matrix for a cylinder with a diameter of 2.5 mm. The success of synthesis of the Fe-based bulk metallic glass from industrial materials is important for the future progress in research and practical application of new bulk metallic glasses. |
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Keywords: | Author Keywords: Casting X-ray diffraction Fe-based alloy Bulk metallic glass Glass-forming ability |
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