High Magnetic Field Processing - A Heat-Free Heat Treating Method

Ludtka, Gerard M.; Ludtka, Gail Mackiewicz; Wilgen, J. B.; Kenik, E.A.; Parish, Chad M.; Rios, Orlando; Rogers, Hiram; Manuel, Michele V.; Kisner, R.A.; Watkins, Thomas R.; Murphy, Bart

doi:10.2172/1049805

Cited by 3 publications

(2 citation statements)

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“…Thermocouples were attached to the surface of the ampoules and used for controlling the temperature. Radio frequency induction heating was used to heat a graphite susceptor surrounding the ampoules inside the bore of a 9 Tesla superconducting magnet [23]. The magnetic field was applied along the long axis of the ribbon samples.…”

Section: Introductionmentioning

confidence: 99%

Magnetic field control of microstructural development in melt-spun Pr2Co14B

McGuire

Rios

Conner

et al. 2017

Journal of Magnetism and Magnetic Materials

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In the processing of commercial rare earth permanent magnets, use of external magnetic fields is limited mainly to the alignment of anisotropic particles and the polarization of the finished magnets. Here we explore the effects of high magnetic fields on earlier stages of magnet synthesis, including the crystallization and chemical phase transformations that produce the 2:14:1 phase in the Pr-CoB system. Pr2Co14B alloys produced by melt-spinning were annealed in the presence of strong applied magnetic fields (H = 90 kOe). The resulting materials were characterized by x-ray diffraction, electron microscopy, and magnetization measurements. We find that magnetic fields suppress the nucleation and growth of crystalline phases, resulting in significantly smaller particle sizes. In addition, magnetic fields applied during processing strongly affects chemical phase selection, suppressing the formation of Pr2Co14B and α-Co in favor of Pr2Co17. The results demonstrate that increased control over key microstructural properties is achievable by including a strong magnetic field as a processing parameter for rare-earth magnet materials.

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Section: Introductionmentioning

confidence: 99%

Magnetic field control of microstructural development in melt-spun Pr2Co14B

McGuire

Rios

Conner

et al. 2017

Journal of Magnetism and Magnetic Materials

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“…It allows customization of the structure of the material at microscale and nanoscale levels in order to tailor the properties and performance of the material. Thermomagnetic processing technology has been successfully used with alloys to selectively control the microstructure stability and phase-transformation kinetics. − Recent developments in the design and manufacturing of high-throughput thermomagnetic processing systems have been enabled by fully recondensing large warm bore superconducting magnets, transient field heating, and extraction systems. − However, the utilization of this technology with polymeric materials has not been fully explored and therefore remains an area of great potential to optimize the performance of polymeric materials. Oriented polymers often exhibit superior mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Thermomagnetic Processing of Liquid-Crystalline Epoxy Resins and Their Mechanical Characterization Using Nanoindentation

Rios

Kessler

2014

ACS Appl. Mater. Interfaces

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A thermomagnetic processing method was used to produce a biphenyl-based liquid-crystalline epoxy resin (LCER) with oriented liquid-crystalline (LC) domains. The orientation of the LCER was confirmed and quantified using two-dimensional X-ray diffraction. The effect of molecular alignment on the mechanical and thermomechanical properties of the LCER was investigated using nanoindentation and thermomechanical analysis, respectively. The effect of the orientation on the fracture behavior was also examined. The results showed that macroscopic orientation of the LC domains was achieved, resulting in an epoxy network with an anisotropic modulus, hardness, creep behavior, and thermal expansion.

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Magnetic Processing of Steel Strip and Next Generation Alloys

Ludtka¹,

Ludtka²,

Rios³

et al. 2013

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High Magnetic Field Processing - A Heat-Free Heat Treating Method

Cited by 3 publications

References 0 publications

Magnetic field control of microstructural development in melt-spun Pr2Co14B

Magnetic field control of microstructural development in melt-spun Pr2Co14B

Thermomagnetic Processing of Liquid-Crystalline Epoxy Resins and Their Mechanical Characterization Using Nanoindentation

Magnetic Processing of Steel Strip and Next Generation Alloys

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