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

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Abstract The viscosity of (Fe 1− X Ni X ) 83 B 17 ( X =0, 0.25, 0.5, 0.75 and 1.0 atomic fractions) and (Fe 0.25 Ni 0.75 ) 78 Al 5 B 17 liquid alloys has been measured by an oscillating crucible method in the temperature range from melting temperature ( T m ) up to about 1400 °C. In the (Fe 1− X Ni X ) 83 B 17 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 (Fe 0.25 Ni 0.75 ) 83 B 17 alloy, the liquid viscosity further increased while the activation energy for viscous flow decreased to about 33 kJ/mol.

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