The glass-forming ability, viscosity, phase composition, and microhardness of a melt-quenched Ni64.4Fe4Cr4.9Mn2B16.2C0.5Si8 bulk amorphous alloy quenched from various melt temperatures at near-critical rates are studied. The melt-quenching temperature ensuring the maximum glass-forming ability and microhardness (HV= 13 GPa) of the alloy is found to be 1200–1230°C. The melt viscosity is shown to behave anomalously near the solidification temperature, and the related factors favoring this anomalous behavior are detected.

Temperature and time dependences of viscosity of the bulk-amorphized $Ni_{64,4}Fe_{2}Cr_{4,9}Mn_{2}B_{16,2}C_{0,5}Si_{8}$ melt have been investigated. The presence of temperature areas of different character of the viscosity temperature dependence has been established. Influence of the initial state of the alloy and its prehistory on viscosity behaviour has been shown. In the area of 1430 °С the abnormal behaviour of viscosity of the melt caused by reverse structural transition has been discovered. It has been shown that higher ability of the alloy to amorphization at low speed of cooling is caused by the considerable relaxation times of the melt structure near the solidification temperature.