scholarly journals Micromagnetic simulation of the orientation dependence of grain boundary properties on the coercivity of Nd-Fe-B sintered magnets

AIP Advances ◽  
2016 ◽  
Vol 6 (5) ◽  
pp. 056028 ◽  
Author(s):  
Jun Fujisaki ◽  
Atsushi Furuya ◽  
Yuji Uehara ◽  
Koichi Shimizu ◽  
Tadashi Ataka ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Orientation Dependence ◽  
Micromagnetic Simulation ◽  
Sintered Magnets ◽  
Boundary Properties

Sintering and Grain Boundary Properties of ZnO-Bi2O3-Sb2O3-Mn3O4-NiO Varistors

2013 ◽  
Vol 51 (5) ◽  
pp. 363-369
Author(s):  
Youn-Woo Hong ◽  
Young-Jin Lee ◽  
Sei-Ki Kim ◽  
Jin-Ho Kim
Keyword(s):  
Grain Boundary ◽  
Boundary Properties

Light Effects on Grain Boundary Properties in Silicon

1981 ◽  
Vol 5 ◽  
Author(s):  
L. J. Cheng ◽  
C. M. Shyu
Keyword(s):  
Experimental Data ◽  
Grain Boundary ◽  
Minority Carrier ◽  
State Density ◽  
Boundary State ◽  
Carrier Recombination ◽  
Boundary Properties ◽  
Light Effects ◽  
Recombination Velocity ◽  
P Type

ABSTRACTWe have studied the photoconductivity of grain boundaries in p–type silicon. The result demonstrates the applicability of the technique for the measurement of minority carrier recombination velocity at the grain boundary. The experimental data are consistent with the thought that the recombination velocity increases with the boundary state density and light intensity.

scholarly journals Microstructure and Magnetic Properties of NdFeB Sintered Magnets Diffusion-Treated with Cu/Al Mixed Dyco Alloy-Powder

2017 ◽  
Vol 62 (2) ◽  
pp. 1263-1266 ◽  
Author(s):  
M.-W. Lee ◽  
K.-H. Bae ◽  
S.-R. Lee ◽  
H.-J. Kim ◽  
T.-S. Jang
Keyword(s):  
Grain Boundary ◽  
Diffusion Path ◽  
Boundary Phase ◽  
Core Shell ◽  
Phase Layer ◽  
Sintered Magnets ◽  
The Core ◽  
Shell Type ◽  
Property Changes ◽  
And Diffusion

AbstractWe investigated the microstructural and magnetic property changes of DyCo, Cu + DyCo, and Al + DyCo diffusion-treated NdFeB sintered magnets. The coercivity of all diffusion treated magnet was increased at 880ºC of 1stpost annealing(PA), by 6.1 kOe in Cu and 7.0 kOe in Al mixed DyCo coated magnets, whereas this increment was found to be relatively low (3.9 kOe) in the magnet coated with DyCo only. The diffusivity and diffusion depth of Dy were increased in those magnets which were treated with Cu or Al mixed DyCo, mainly due to comparatively easy diffusion path provided by Cu and Al because of their solubility with Ndrich grain boundary phase. The formation of Cu/Al-rich grain boundary phase might have enhanced the diffusivity of Dy-atoms. Moreover, relatively a large number of Dy atoms reached into the magnet and mostly segregated at the interface of Nd2Fe14B and grain boundary phases covering Nd2Fe14B grains so that the core-shell type structures were developed. The formation of highly anisotropic (Nd, Dy)2Fe14B phase layer, which acted as the shell in the core-shell type structure so as to prevent the reverse domain movement, was the cause of enhancing the coercivity of diffusion treated NdFeB magnets. Segregation of cobalt in Nd-rich TJP followed by the formation of Co-rich phase was beneficial for the coercivity enhancement, resulting in the stabilization of the metastable c-Nd2O3phase.

Reversed anisotropy of grain boundary properties and its effect on grain boundary engineering

2010 ◽  
Vol 58 (6) ◽  
pp. 1930-1937 ◽  
Author(s):  
Pavel Lejček ◽  
Aleš Jäger ◽  
Viera Gärtnerová
Keyword(s):  
Grain Boundary ◽  
Grain Boundary Engineering ◽  
Boundary Properties

Comparison of Experimental and Computational Aspects of Grain Growth in Al-Foil

2000 ◽  
Vol 652 ◽  
Author(s):  
Melik C. Demirel ◽  
Andrew P. Kuprat ◽  
Denise C. George ◽  
Bassem S. El-Dasher ◽  
Neil N. Carlson ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Grain Growth ◽  
Three Dimensional ◽  
Interface Energy ◽  
Grain Structure ◽  
Electron Backscattered Diffraction ◽  
Boundary Properties ◽  
Ebsd Technique ◽  
Columnar Grain ◽  
Grain Boundary Motion

ABSTRACTGrain boundary and crystallographic orientation information of an Al-foil with a columnar grain structure is characterized by Electron Backscattered Diffraction (EBSD) technique. The starting microstructure and grain boundary properties are implemented as an input for the three- dimensional grain growth simulation. In the computational model, minimization of the interface energy is the driving force for the grain boundary motion. The computed evolved microstructure is compared with the final experimental microstructure, after annealing at 550 °C. Good agreement is observed between the experimentally obtained microstructure and the simulated microstructure. The constitutive description of the grain boundary properties was based on a 1- parameter characterization of the variation in mobility with misorientation angle.

Improved corrosion resistance of low rare-earth Nd–Fe–B sintered magnets by Nd6Co13Cu grain boundary restructuring

2015 ◽  
Vol 379 ◽  
pp. 186-191 ◽  
Author(s):  
Pei Zhang ◽  
Tianyu Ma ◽  
Liping Liang ◽  
Xiaolian Liu ◽  
Xuejiao Wang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Rare Earth ◽  
Grain Boundary ◽  
Sintered Magnets
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