Magnetic field intensity dependent microstructure evolution and recrystallization behavior in a Co-B eutectic alloy  

作　　者：Fan Bu Yiyuan Zhang Haoxiang Liu Jun Wang Eric Beaugnon Jinshan Li Yixuan He 

机构地区：[1]State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an 710072,China [2]Center of Advanced Lubrication and Seal Materials,Northwestern Polytechnical University,Xi’an 710072,China [3]Collaborative Innovation Center of NPU,Shanghai 201108,China [4]Institute of Superconducting Materials and Applied Technology,Northwestern Polytechnical University,Xi’an 710072,China [5]Univ.Grenoble Alpes,INSA Toulouse,University Toulouse Paul Sabatier,EMFL,CNRS,LNCMI,Grenoble 38000,France

出　　处：《Journal of Materials Science & Technology》2023年第7期93-107,共15页材料科学技术（英文版）

基　　金：This work was financially supported by the National Natu-ral Science Foundation of China(Nos.52104386 and 52127807);Shanghai Sailing Program,Xi’an Association for Science and Tech-nology Young Talents Lifting Program,and the State Key Laboratory of Solidification Processing(NPU),China(No.2022-TS-08).We acknowledge the support of the LNCMI-CNRS,member of the Euro-pean Magnetic Field Laboratory(EMFL).We also thank Dr.Zheng from ZKKF(Beijing)Science&Technology Company for supporting the characterization of the materials.

摘　　要：Systematic understanding on the magnetic field intensity dependent microstructure evolution and re-crystallization behavior in a Co-B eutectic alloy under a constant undercooling(ΔT≈100 K)were carried out.Absent of the magnetic field,the comparable size of divorced FCC-Co and Co_(3)B eutectic ellipsoidal grains coexist with a few regular lamellas.When the magnetic field is less than 15 T,the elongated primary FCC-Co dendrites parallel to the magnetic field with the dispersed FCC-Co nano-particles em-bedded within the Co_(3)B matrix occupy the inter-dendrite regions.Once the magnetic field increases to 20 T,the FCC-Co/Co_(2)B anomalous eutectic colonies dominate.The formation mechanism of Co_(2)B phase is discussed from several aspects of the competitive nucleation,the chemical redistribution induced by the thermomagnetic-induced convection and magnetic dipole interaction,and the strain-induced trans-formation.Furthermore,the application of magnetic field is found to promote recrystallization,proved by the lower density of misorientation,the appearance of FCC-Co annealed twins and more Co_(3)B sub-grains.This work could further enrich our knowledge about the magnetic-dependent microstructure evolution and recrystallization process in the undercooled Co-B system and provide guidance for controlling the microstructures and properties under extreme conditions.

关 键 词：Magnetic field Undercooled solidification Microstructure evolution RECRYSTALLIZATION Co-B alloy 

分 类 号：TG111.4[金属学及工艺—物理冶金]