Developing Substitutes Research Highlights

High-performance critical-element-free permanent magnets

CMI researchers at Ames Laboratory conducted the research for the CMI highlight on High-performance critical-element-free permanent magnets

$X-ray diffraction patterns of precursor phases to L10 FeNi.$

High-strength, high temperature bonded magnets

CMI researchers at Oak Ridge National Laboratory and Ames Laboratory collaborated on the research for this CMI highlight on high-strength, high temperature NdFeB PPS bonded magnets

Magnetic hysteresis loops of AM fabricated NdFeB PPS bonded PM at room temperature. Sample ID: 1.1- as printed; 1.2-uncoated (dipped in pH 1.35 solution for 24 h), 1.3- coated with 3M ScotchWeld DP100 (dipped in pH 1.35 solution 24 h), 1.4- uncoated (aged at 80 °C; 95% RH; > 120 h), 1.5- coated with 3M ScotchWeld DP100 (80 °C; 95% RH; > 100 h) (bottom). Note the improved performance of the coated samples 1.3 and 1.5 relative to the uncoated samples 1.2 and 1.4.

Potential Alnico-surpassing gap magnet

CMI researchers at Iowa State University, Ames Laboratory and UC-Davis collaborated with researchers at the University of Nebraska at Lincoln for this highlight on a potential Alnico-surpassing gap magnet

Easy and hard-axis magnetic field sweeps in (Fe1-xCox)2B, x= 0.3, depicting a significant uniaxial anisotropy field of 0.6 Tesla. Anisotropy field at 500 K (not shown) essentially unchanged.

Improving alnico magnets using thermomagnetic processing

CMI researchers at Ames Laboratory and Oak Ridge National Laboratory demonstrated increases in coercivity and energy product and tuning of phase transformation temperatures in alnico using high magnetic field processing

Demonstration of increases in both coercivity and energy product of alnico when heat treated in a magnetic field.

New CMI capability: rare earth magnet powder synthesis in high magnetic fields

CMI researchers at Ames Laboratory and Oak Ridge National Laboratory designed and demonstrated a new reactor for producing rare earth magnet materials in high magnetic fields via hydrogenation-disproportionation-desorption-recombination (HDDR) chemistry.

The 9 Tesla superconducting magnet accommodates the specially designed HDDR reactor.

Finite Element Model for mechanical properties of SmCo5

CMI research conducted at Ames Laboratory developed a finite-element (FE) model for a SmCo5 magnet matrix with Sm2O3 impurities. The results accurately predict the stress distribution from a three-point bend analysis to identify domains of stress concentration and failure.

FEM vs. Microstructural model, showing the stress-strain relationship to be accurately captured by the computationally less intensive FEM model. This allows for very rapid assessments of mechanical properties of novel architectures.

Magnetically aligned electrodes predicted to increase lithium-ion battery capacity by as much as 25%

CMI research at Ames Laboratory developed a coupled electrochemical-thermal-mechanical model to predict the electrochemical degradation and performance of magnetically aligned electrodes in lithium-ion batteries for fast-charging applications

Capacity gain vs. relative tortuosity. Note the more than 25% gain at low tortuosity for the high charging rate 4C.

Critical materials periodic table

CMI research produced a Critical Materials Periodic Table. Every element includes market pricing, supplier information, U.S. import reliance, and crustal abundance.

Functionalizing magnet additive manufacturing systems with in-situ magnetic field source

CMI technical publication on functionalizing permanent magnet additive manufacturing systems with a magnetic field source. The field source was modeled, designed, prototyped and tested on an existing table-top commercial 3D printer.

Depiction of the magnetic-field aligning permanent magnet-producing apparatus, side view.

Ce-based gap magnets match high-temperature performance of neo

CMI research at Ames Laboratory Achievement showed that at certain temperatures a cerium-based magnet matches the energy product of and exceeds the coercivity of neodymium permanent magnets