Journal ArticleDOI
The origin of crystallographic texture produced during hot deformation in rapidly-quenched NdFeB permanent magnets
Lin Li,C.D. Graham +1 more
- Vol. 28, Iss: 5, pp 2130-2132
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In this article, the authors present a model for the development of crystallographic texture by hot deformation in NdFeB magnets produced by rapid solidification, where favorable oriented grains, with their c-axis parallel to the compression axis, grow by mass transport through a Ndrich liquid grain boundary phase, forming large platelet grains.Abstract:
The authors present a model for the development of crystallographic texture by hot deformation in NdFeB magnets produced by rapid solidification Favourably oriented grains, with their c-axis parallel to the compression axis, grow by mass transport through a Nd-rich liquid grain boundary phase, forming large platelet grains The driving force is the elastic energy difference between grains with c-axes making different angles with the compression axis Numerical calculations based on the known properties and conditions of these materials are consistent with a liquid diffusion model >read more
Citations
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Journal ArticleDOI
Hot deformation of nanocrystalline Nd-Fe-B alloys
TL;DR: In this paper, the deformation and formation-of-texture processes can be explained by the model of solution-precipitation creep, where the main driving forces of deformation processes are the chemical potentials of the atomic species in the liquid phase or at the surfaces of the crystallites.
Journal ArticleDOI
High‐remanence rapidly solidified Nd‐Fe‐B: Die‐upset magnets (invited)
C. D. Fuerst,E. G. Brewer +1 more
TL;DR: The best starting materials for die-upset magnets are moderately overquenched melt-spun ribbons of Nd•Fe•B alloys with ∼20% more rare earth than stoichiometric Nd2Fe14B as mentioned in this paper.
Journal ArticleDOI
Effects of Nd-rich phase on the improved properties and recoil loops for hot deformed Nd-Fe-B magnets
Y. H. Hou,Y.L. Wang,Y.L. Huang,Y. L. Wang,S. Li,S.C. Ma,Zhongwu Liu,Dechang Zeng,L.Z. Zhao,Zhenchen Zhong +9 more
TL;DR: In this article, a non-uniform distribution of Nd-rich phase with dimension up to a few micrometers was observed in nanocrystalline hot deformed (HD) magnet.
Journal ArticleDOI
Effect of Cu and Ga additions on the anisotropy of R2Fe14B/α-Fe nanocomposite die-upset magnets (R=Pr, Nd)
TL;DR: In this paper, the microstructure of oriented platelet grains is similar to that of the R 2 Fe 14 B/α-Fe die-upset magnet, and small additions of Cu make the texturing possible.
Journal ArticleDOI
Effect of Nd content on induced anisotropy in hot deformed FeNdB magnets
M. Leonowicz,Hywel A. Davies +1 more
TL;DR: In this paper, the magnetic properties of die-upset forged FeNdB magnets with Nd content varying from 6 to 20 at% have been studied.
References
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Journal ArticleDOI
LXXV. A dynamical theory of diffusion for non-electrolytes and the molecular mass of albumin
TL;DR: A dynamical theory of diffusion for non-electrolytes and the molecular mass of albumin was proposed in this article, where the authors also considered the non-electricity of non-conductive materials.
Journal ArticleDOI
The development of the microstructure of die-upset Nd-Fe-B magnets
TL;DR: The microstructure of Nd-Fe-B permanent magnets, melt-spun and then die upset to varying extents, establishes a mechanism for the development of crystallographic texture and favorable magnetic properties as discussed by the authors.
Journal ArticleDOI
Nd‐Fe‐B die‐upset and anisotropic bonded magnets (invited)
TL;DR: In this article, hot working conditions were examined for Nd−Fe−B die-upset magnets. And the Nd14Fe80B6 ternary composition has the best workability (die upsetting) from stress-strain curves for the initial stage of die upsetting at hot working temperature.
Journal ArticleDOI
Mechanism of texture formation by hot deformation in rapidly quenched FeNdB
Lin Li,C. D. Graham +1 more
TL;DR: In this article, the development of crystallographic texture in rapidly quenched Fe14Nd2B has been investigated by hot deformation and it was concluded, in agreement with others but with additional evidence, that preferential growth of favorably oriented grains during plastic deformation produces the texture.
Journal ArticleDOI
Hot workability of melt-spun Nd-Fe-Co-B magnets
TL;DR: In this article, the deformation mechanism of the alloy system and the effect of changes in alloy composition were investigated. And the relationship between strain rate and flow stress was found to be expressed by the equation: e = Aσn exp( − Q/RT).