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Magnetic field intensity dependent microstructure evolution and recrystallization behavior in a co-b eutectic alloy

Journal of Materials Science & Technology 2023年第7期138卷 93-107页

作者： Fan bu Yiyuan Zhang Haoxiang Liu Jun Wang Eric beaugnon Jinshan Li Yixuan He State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Center of Advanced Lubrication and Seal Materials Northwestern Polytechnical UniversityXi’an 710072China collaborative Innovation Center of NPU Shanghai 201108China Institute of Superconducting Materials and Applied Technology Northwestern Polytechnical UniversityXi’an 710072China Univ.Grenoble Alpes INSA ToulouseUniversity Toulouse Paul SabatierEMFLCNRSLNCMIGrenoble 38000France

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 *** of the magnetic field,the comparable size of divorced FCC-co and co_(3)b eutectic ellipsoidal grains coexist with a few regular *** 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 *** the magnetic field increases to 20 T,the FCC-co/co_(2)b anomalous eutectic colonies *** 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 ***,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 *** 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

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Density functional theory study of co catalytic oxidation on co_2b_2/TiO_2(110) surface

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Journal of Natural Gas Chemistry 2010年第3期19卷 300-306页

作者： Qingsong Zeng Wenkai Chen Yongfan Zhang Wenxin Dai Xin Guo Department of Chemistry Fuzhou University Fuzhou 350108 Fujian China college of Chemistry and Engineering Research Institute of Photocatalysis Fuzhou University Fuzhou 350002 Fujian China State Key Laboratory of coal combustion Huazhong University of Science and Technology Wuhan 410074 Hubei China

Titanium dioxide with cob amorphous alloys nanoparticles deposited on the surface is known to exhibit higher catalytic activity than the cob amorphous.A study of the structure of such system is necessary to understand this effect.A quantum chemical study of co2b2 on the TiO2（110） surface was studied using periodic slab model within the framework of density functional theory（DFT）.The results of geometry optimization indicated that the most stable model of adsorption was co2b2 cluster adsorbed on the hollow site of TiO2 .The adsorption energy calculated for co2b2 on the hollow site was 439.3 kJ/*** adsorption of co and O2 was further studied and the results indicated that co and O2 are preferred to adsorb on the co2 ***-adsorption of co and O2 shows that co2b2 /TiO2 is a good catalyst for the oxidation of co to carbon dioxide in the presence of oxygen.

关键词： density functional theory co-b alloy co TiO2 O2

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