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Effect of ce-rich mish metals and electromagnetic stirring on microstructure of AZ91D magnesium alloy

中国有色金属学会会刊：英文版 2005年第S3期15卷 1-6页

作者：杨宝亮李子全陈可汪涛胡孝昀周衡志 College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

The influence of ce-rich mish metal（MM） and electromagnetic stirring（EMS） on microstructure evolution of AZ91D magnesium alloy was investigated by optical microscopy, scanning electron microscopy（SEM）, energy dispersion spectrum（EDS） and X-ray diffraction（XRD）. The microstructure of AZ91D and alloying AZ91D is different. Except dominant primary α（Mg） and β-Mg 17Al 12 in AZ91D, a new phase Al 11MM3 is observed in alloyed AZ91D. Increasing ce-rich MM, primary α grains can be refined, the content and grain size of β obviously decrease, furthermore, its morphology degrades from discontinuous network to separated particles, and Al 11MM3 amount substantially increases and acicular Al 11MM3 aggregates into clusters at grain boundaries. In EMS process, α morphology evolves from rosette to sphere, and then spherical-like with the decrease of isothermal stirring temperature. Moreover, Al 11MM3 mainly distributes inside primary grains and eutecticum in form of short-rod. EMS can alter not only the primary morphology but Al 11MM3.

关键词： electromagnetic stirring ce-rich mish metals AZ91D non-dendritic microstructure isothermal stirring

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Dependence of magnetic properties on microstructure and composition of ce-Fe-B sintered magnets

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Journal of Rare Earths 2019年第8期37卷 865-870,I0003页

作者： Longlong Xi Anhua Li Haibo Feng Min Tan Wei Sun Minggang Zhu Wei Li Division of Functional Materials Central Iron and Steel Research InstituteBeijing 100081China National Engineering Research center for Magnetic Materials Beijing 102600China

In this paper,dependence of magnetic properties on microstructure and composition of ce-Fe-B sintered magnets with Cu-doped ce-rich alloy addition was *** shows that the maximum energy product(BH)(max)and coercivity H(cj)of ce-Fe-B sintered magnet are improved from 6.76 to 9.13 MGOe by 35.1%,and from 1.44 to 1.67 kOe by 16.0%,respectively,via adding 5 wt%liquid phase alloy of ce(35.58)Fe(57.47)Cu6 B(0.95)(at%).Compared with the magnet without cerich alloy addition,the volume fraction of the grain-boundary phase with low melting point increases in the magnet with ce-rich alloy additio n,which is be ne ficial to imp roving the microstructure and promoting the coercivity enhancement of the *** the ce-Fe-B magnet with ce-rich alloy addition,Cu and ce enrich in the grain boundaries of the magnet after annealing,therefore the as-annealed magnet has a higher coercivity than the as-sintered magnet.A distinct Fe-rich layer with the average thickness of 60 nm is found in the grain boundaries in the magnet without ce-rich alloy addition,but it seems that Fe-rich phase disappears in the magnet with ce-rich alloy *** present work suggests that the further improvement of coercivity in the ce-Fe-B sintered magnets is expectable by designing the composition and structure of added liquid phase alloys.

关键词： ce-Fe-B ce-rich liquid phase alloy Cu doping Microstructure Coercivity Rare earths

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