Viscosity measurements for Fe-Ni-B and Fe-Ni-Al-B liquid alloys by an oscillating crucible method

The viscosity of (Fe1-XNiX)83B17 (X=0, 0.25, 0.5, 0.75 and 1.0 atomic fractions) and (Fe0.25Ni0.75)78Al5B17 liquid alloys has been measured by an oscillating crucible method in the temperature range from melting temperature (Tm) up to about 1400 deg. C. In the (Fe1-XNiX)83B17 liquid alloys, the viscosity decreased with increasing Ni content up to about X=0.5 and then increased to a maximum value at X=0.75. The activation energy for viscous flow decreased to the minimum value of about 37 kJ/mol at X=0.75. This composition is well consistent with those of the Fe-Ni-B alloys having a large glass-forming ability. When Al is added in the (Fe0.25Ni0.75)83B17 alloy, the liquid viscosity further increased while the activation energy for viscous flow decreased to about 33 kJ/mol