Effect of High Magnetic Field on the Microstructure Evolution Behavior of Undercooled Cu-Co Alloy

Author of the article:WEI Chen, LI Jinshan, YAN Yujie, LIN Kaixi, WANG Jun

Author's Workplace：School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China

Key Words： liquid-liquid phase separation; solidification; high-intensity magnetic field; microstructure evolution

Abstract：The effect of high magnetic field on the microstructure evolution behavior of undercooled Cu-50at.% Co alloy was studied, and the mechanism of high magnetic field was discussed based on relevant theories. The results show that the high magnetic field significantly changes the liquid phase separation behavior of the alloy. The core-shell structure changes due to the action of magnetostatic energy. In the direction of parallel magnetic field, the Co-rich phase and the Cu-rich phase separated by secondary phase are elongated along the magnetic field direction. With the increase of magnetic field intensity, the co-rich phase is elongated more significantly, and the relatively uniform distribution of co-rich phase microstructure is obtained in the direction perpendicular to the magnetic field. After solidification, the speed of saturation magnetization of Cu-Co alloy is obviously accelerated under 10 T high magnetic field. In addition, the resistivity of the alloy decreases with the increase of magnetic field intensity and subcooling.