J. Mater. Sci. Technol. ›› 2024, Vol. 175: 47-54.DOI: 10.1016/j.jmst.2023.07.037

• Research article • Previous Articles     Next Articles

Effect of a high-gradient magnetic field on grain refinement of a hypoeutectic Mn-Sb alloy during directional solidification

Jinmei Suna,c, Tie Liua,*, Xiaoyu Guoa,d, Shuang Yuand, Jun Wangb, Noriyuki Hirotae, Qiang Wanga   

  1. aKey Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, Shenyang 110819, China;
    bState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China;
    cSchool of Materials Science and Engineering, Northeastern University, Shenyang 110819, China;
    dSchool of Metallurgy, Northeastern University, Shenyang 110819, China;
    eResearch Center for Fundamental Materials, National Institute for Materials Science, Tsukuba 305-0003, Japan
  • Received:2023-03-27 Revised:2023-07-07 Accepted:2023-07-17 Published:2024-03-10 Online:2023-09-03
  • Contact: *E-mail address: liutie@epm.neu.edu.cn (T. Liu)

Abstract: The obvious grain refinement of the primary MnSb phase has been observed in the Mn-89.7 wt% Sb alloy directionally solidified under a high-gradient magnetic field. With the application of a high-gradient magnetic field, the morphology of the primary MnSb phase transformed from developed dendritic-like to equiaxed-like, and the grain size decreased by approximately 93%. Refinement of the primary MnSb phase can be attributed to the constituent supercooling in front of the solidification interface, which promoted nucleation of the primary MnSb phase. The constituent supercooling can be linked to the enrichment of the Mn solute induced by the magnetic force and the Lorentz force that drove Mn solute migration and suppressed convection.

Key words: Grain refinement, High-gradient magnetic field, Magnetic force, Lorentz force, Directional solidification