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The microstructures and thermal properties of Fe61Co9-xZr8Mo5WxB17 (x=0 and 2) formed under different vacuum conditions were investigated by scanning electron microscopy(SEM), X-ray diffractometry(XRD), transmission electron microscopy(TEM), and conventional dilatometry(DIL). The variation of the non-monotonic effects of tungsten content and vacuum conditions on the glass forming ability(GFA) of Fe-based alloys can be drawn in a schematic diagram. The higher the GFA of alloys, the higher the difference between the thermal expansion coefficients of glassy state and crystalline state(-α), which can be described by the free volume model during dilatometric measurements. Under low and high vacuum conditions, the viscosity and microhardness are improved and the fragility of the Fe-based alloys are decreased by adding tungsten.
The microstructures and thermal properties of Fe61Co9-xZr8Mo5WxB17 (x = 0 and 2) formed under different vacuum conditions were investigated by scanning electron microscopy (SEM), X-ray diffractometry (XRD), transmission electron microscopy (TEM), and conventional dilatometry DIL). The variation of the non-monotonic effects of tungsten content and vacuum conditions on the glass forming ability (GFA) of Fe-based alloys can be drawn in a schematic diagram. The higher the GFA of alloys, the higher the difference between the thermal expansion coefficients of glassy state and crystalline state (-α), which can be described by the free volume model during dilatometric measurements. the low and high vacuum conditions, the viscosity and microhardness are improved and the fragility of the Fe-based alloys are decreased by adding tungsten.