Abstract
High magnetic field is a powerful tool to tune the microstructure and improve the properties of materials. In this report, the nucleation behavior of undercooled Co76Sn24 near eutectic alloy under strong homogeneous and gradient magnetic fields have been investigated using glass slag fluxing method in a 12 T superconducting magnet. The mean undercooling of the undercooled melt is not altered by homogeneous magnetic field but depressed by gradient magnetic field. The highest temperature during recalescence is strongly altered by magnetic field, where an enhancement effect is observed under gradient magnetic field and an opposite effect in homogeneous magnetic field. The reason is interpreted by discussion about the magnetic field on the thermodynamics of nucleation and also the purifying effect of the glass slag, the magnetic properties and the magnetic force exerted on the undercooled melt.
Highlights
Non-equilibrium solidification, e.g. rapid quenching, has been successfully applied to produce many metastable solids from the liquid state during the past few decades[1, 2]
Tsukada et al found Co-rich phase separated from undercooled Co-Cu alloys in high magnetic field[22]
The temperature profiles of Co76Sn24 near eutectic alloy solidified in and without magnetic field are shown in Fig. 2(a,b) and (c)
Summary
Non-equilibrium solidification, e.g. rapid quenching, has been successfully applied to produce many metastable solids from the liquid state during the past few decades[1, 2]. The temperature profiles of Co76Sn24 near eutectic alloy solidified in and without magnetic field are shown in Fig. 2(a,b) (homogeneous magnetic field) and (c) (gradient magnetic field).
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