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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium Materials Science for High-Performance Permanent Magnets
Presentation Title Quantifying the True Enhancement in Coercivity by Dy Diffusion into Sintered Nd-Fe-B Alloys
Author(s) Cajetan Ikenna Nlebedim, Matthew Joseph Kramer
On-Site Speaker (Planned) Cajetan Ikenna Nlebedim
Abstract Scope Coercivity and its temperature dependence can be improved by diffusing Dy into sintered Nd-Fe-B. It involves coating sintered Nd-Fe-B with DyF<sub>3</sub> and facilitating diffusion by heat treatment. Magnetic properties of Dy-diffused Nd-Fe-B are reported to improve compared to the starting materials. However, this approach assumes that magnetic properties improvements are only due to the diffused Dy. This presentation will show that such assumption over-quantifies the effect of Dy. It will be shown that, with appropriate heat treatment, comparable improvement in magnetic properties can be obtained without Dy diffusion. This study provides insight into quantifying the true gain in magnetic properties via Dy diffusion into sintered Nd-Fe-B magnets. This is important because Dy is a critical magnet manufacturing raw material. Acknowledgement: This work was supported by the Critical Materials Institute, an Energy Innovation Hub funded by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office.
Proceedings Inclusion? Undecided

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Ab-initio Study of Transition-metal-doping Effects on the Magnetic Anisotropy in Nd-Fe- B Sintered Magnets
Analyses on Magnetization Reversal Process of Nd-Fe-B Hot-deformed Magnets
Bulk High-throughput Experimentation to Discover New Hard Magnets
Coercivity and Strength Enhancement of a Binder Jetted NdFeB Bonded Magnet by (Pr,Nd)-Cu-Co Alloy Infiltration
Coercivity Enhancement of Hot-deformed NdFeB Magnets by GBDP with NdHx and Metallic Nanoparticles
Data-driven Approach for Magnetic Neutron Scattering Data Analysis of Permanent Magnets Using Statistical Learning and Artificial Intelligence
Demagnetizing Fields and Magnetization Reversal in Permanent Magnets
Electrical Resistivity Enhancement by Doping with Eutectic DyF3–LiF Salt Mixture in Nd-Fe-B Die-upset Magnet
Electronic States of Rare Earth Elements in Permanent Magnet Materials Probed by X-ray Magnetic Circular Dichroism Nano-Spectroscopy
Fabrication of Nd-Fe-B Thin Films as a Model Material
Fabrication of Submicrometer-sized Sm2Fe17N3 Hard Magnetic Particles
First-principles Study of ThMn12-type Iron-based Rare-earth Intermetallics
Grain Boundary Diffusion of Co, Cu and Nb as Function of Temperature in NdFeB
Grain Boundary Diffusion of Different Rare Earth Elements in Nd-Fe-B Sintered Magnets by Experiment and FEM Simulation
Grain Size Refinement of Ga-doped Nd-Fe-B Magnet
High-coercivity Dy-free Nd-Fe-B Permanent Magnets
High Magnetic Field Processing of Melt-spun Permanent Magnet Alloys
Imaging the Changes in Magnetic Domain Structure in Nd-Fe-B Sintered Magnets throughout the Demagnetisation Process by Soft X-ray Magnetic Circular Dichroism Microscopy
L10-FeNi Films with Coercivity in Excess of 1 kOe: A Combinatorial Sputtering Approach
Large-scale Micromagnetics Simulation for Initial Magnetization Process in Nd-Fe-B Hot-deformed Nanocrystalline Magnet
Magnetic Anisotropy and Crystallographic Alignment in d-HDDR Process of Nd-Fe-B-Ga-Nb Powders
Magnetic Anisotropy of Epitaxially Grown L10 Mn-(Ga,Al) Alloy Thin Films
Magnetic Anistropy and Microstructure Interplay in Fe16N2 Based Permanent Magnets
Microstructural Characterization of Magnetic MnAl Alloys
Microstructural Engineering of Nd-Fe-B Permanent Magnets with Significantly Reduced Dy
Microstructure and Coercivity in Ultra-fine Grained Nd-Fe-B Sintered Magnets
Microstructure Formation of Strip-cast R-Fe-B Alloys for Magnets
New Hard Magnetic ThMn12-type phases with Low Rare Earth Contents for Permanent Magnet Applications
Phase Equilibria in the Nd-based Permanent Magnets
Powder-processed High-performance Alnico Magnets by Thermal Gradient Control
Prospects for Advanced Manufacturing of Magnets
Quantifying the True Enhancement in Coercivity by Dy Diffusion into Sintered Nd-Fe-B Alloys
Recent Developments in High Coercivity Nd-lean Nd-Fe-B Infiltrated Magnets
Recent Developments in RFe12-type Compounds for Permanent Magnets
Reduced Cobalt Energy Efficient “Green” Alnico
Search for New Rare-earth-free Hard Magnetic Materials Using Solution Growth
Search for Substitutes of Magnetic Materials Containing Critical Elements by High-throughput Screening and Multi-scale Modeling Approaches
Stability Origin of Binary Systems Relevant to Multi-component Phase in Nd-Fe-B
Structural Evolution in Alnico -- A Transmission Electron Microscopy and Atom Probe Tomography Study
Structure and Magnetic Properties of Fe3Sn1-xMx (M=Sb, P)
Synthesis and Processing of Hard Iron Oxide Nanocomposites for Rare Earth Free Permanent Magnets
Tailoring the Coercive Field of Grain Boundary Engineered Magnets: A Nanoanalytical TEM and Micromagnetic Simulation Study
Temperature Dependence of the Magnetization and Magnetic Anisotropy Measured on the Epitaxial RFe12 (-Nx) (R = Sm and Nd) Thin Films with ThMn12 Structure
Temperature Dependence of Threshold of Magnetic Fields for Nucleation and Domain Wall Propagation
Texture Development Mechanism in HDDR Processed Nd-Fe-B Magnet
The Current State and Future of the Rare Earth Magnets
Theoretical Study on Atomic Structures and Coercivity in Nd-Fe-B Magnets
Theoretical Study on the Temperature Dependence of Magnetic Anisotropy Constants of Rare Earth Permanent Magnets
Towards High-performance Permanent Magnets without Rare Earths

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