The influence of pressure on the phase stability of nanocomposite Fe89Zr7B4 during heating from energy dispersive x-ray diffraction

Leary, Alex; Lucas, M. S.; Ohodnicki, Paul R.; Kernion, Samuel J.; Mauger, L.; Park, Changyong; Kenney‐Benson, Curtis; McHenry, Michael E.

doi:10.1063/1.4795326

Cited by 7 publications

(2 citation statements)

References 22 publications

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“…Ingots were melt-spun to quench the alloys and retain a single, disordered FCC phase. Energy dispersive x-ray diffraction measurements were taken in a Paris-Edinburgh cell [33]- [35] at the HPCAT 16-BM-B high pressure station at Argonne National Lab's Advanced Photon Source. They were converted to conventional angle-dispersive spectra using Bragg's law.…”

Section: Experimental Procedurementioning

confidence: 99%

Understanding Magnetic Exchange Interactions by the Pressure Dependent Curie Temperature in FeCoNiCuMn High Entropy Alloys

Perrin

McCall

McElfresh

et al. 2021

J. Phase Equilib. Diffus.

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Section: Experimental Procedurementioning

confidence: 99%

Understanding Magnetic Exchange Interactions by the Pressure Dependent Curie Temperature in FeCoNiCuMn High Entropy Alloys

Perrin

McCall

McElfresh

et al. 2021

J. Phase Equilib. Diffus.

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“…Ohodnicki et al 29 detailed crystallization in Co-rich (Co, Fe)-based amorphous alloys. Leary et al 30 reported pressure effects in NANOPERM Fe-based MANCs.…”

Section: Manc Synthesis Chemistry and Property Developmentmentioning

confidence: 99%

Finite element analysis modeling of high voltage and frequency 3-phase solid state transformers enabled by metal amorphous nanocomposites

et al. 2018

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Determination of Pressure Effects on the α → γ Phase Transition and Size of Fe in Nd-Fe-B Spring Exchange Magnets

Abuín

Turgut

Aronhime

et al. 2015

Metall Mater Trans A

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Pressure effects in RE-lean Nd 2 Fe 14 B-based nanocomposite systems developed from nanocrystalline precursors are studied in this work. In particular, the pressure dependence of the a -> y phase transformation in the Fe phase is examined along with the suppression of coarsening (growth) in both phases at higher pressures. By synchrotron X-ray diffraction we determined that the a -> y-phase transformations occur at temperatures of 1120 K (847 °C) at 1 GPa and 960 K (687 °C) at 5 GPa. A composition rich in Fe appears to have an -373 K (100 °C) range of temperature over which the a, y-phases coexist for atmospheric pressure. We compare our experimental data with other reported observations for Fe and with equations of state (EOS) determined from first principle calculations. From this study we observe an important feature: the phase transition begins at a higher temperature in flake samples than in powder samples. We consider the magnetic contribution to the heat capacity in the EOS for Fe and describe the implications of dipole moments on the slope of the Clapeyron equation for the P-T phase diagram in Fe. Additionally, the phase transition occurs at temperatures where growth by diffusional coarsening is also operative. This is significant since the size of soft Fe nanostructures is important to spring exchange. Suppression of the phase transition and Fe coarsening at higher pressures suggest that there may be interesting mechanical processing routes to be investigated to optimize spring exchange effects in Nd-Fe-B permanent magnets.

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The influence of pressure on the phase stability of nanocomposite Fe89Zr7B4 during heating from energy dispersive x-ray diffraction

Cited by 7 publications

References 22 publications

Understanding Magnetic Exchange Interactions by the Pressure Dependent Curie Temperature in FeCoNiCuMn High Entropy Alloys

Understanding Magnetic Exchange Interactions by the Pressure Dependent Curie Temperature in FeCoNiCuMn High Entropy Alloys

Finite element analysis modeling of high voltage and frequency 3-phase solid state transformers enabled by metal amorphous nanocomposites

Determination of Pressure Effects on the α → γ Phase Transition and Size of Fe in Nd-Fe-B Spring Exchange Magnets

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