Effect of the Nb and Cu Addition on Thermal Stability and Glass-Forming Ability of the Fe36Co36Y8B20 BMG
P. Rezaei-Shahreza, P. Moosavi, S. Hasani, A. Seifoddini
Department of Mining and Metallurgical Engineering, Yazd University, 89195-741, Yazd, Iran
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A series of the (Fe36Co36Y8B20)100-xNbx (x=0, 0.1, and 0.5 at.%) and (Fe36Co36Y8B20)100-xCux (x=0 and 0.1 at.%) amorphous alloys were fabricated by a conventional copper mold casting technique. The effects of the minor addition of niobium (Nb) and copper (Cu) on their thermal properties and glass-forming ability were discussed in detail. The results of X-ray diffraction and differential scanning calorimetry tests showed that the partial addition of Nb and Cu can effectively change the thermal properties and thermal stability of the investigated alloys. Hence, the glass-forming ability criteria, including supercooled liquid region (ΔTx), reduced glass transition temperature (Trg), criterion α, and criterion β, were calculated to evaluate the thermal stability. The supercooled liquid region was increased from 120° for Nb-free alloy to 138 and 127° for the alloy with 0.5 at.% Nb and 0.1 at.% Cu, respectively. As a result, the high glass-forming ability of the FeCo-based glass alloys and the improvement of this property by adding Nb and Cu may encourage the use of these alloys in future industrial devices.

DOI:10.12693/APhysPolA.142.60
topics: bulk metallic glass (BMG), glass-forming ability, thermal stability, differential scanning calorimetry