Structural Transitions in Melts of Soft-Magnetic Fe-Si-B-Based Alloys at Heating and Cooling

摘要

The temperature dependences of kinematic viscosity of glass-forming melts Fe_(80)Si_6B_(14), Fe_(77)Si_8B_(15), Fe_(78)Ni_1Si_9B_(12), Fe_(78.5)Ni_1Mo_(0.5)Si_6B_(14), and Fe_(73.6)Nb_(2.4)Cu_1Si_(15.8)B_(7.2) within the interval of temperatures 1200-1600 deg C during the heating and cooling schedules are investigated. In polytherms, the anomalies such as a sharp decrease of viscosity at a heating schedule and its hysteresis at the subsequent cooling are revealed. The revealed anomalies of viscosity are explained within the framework of the theory of the long-wave fluctuations of density in glass-forming melts.