Predict Magnetic Permeability?

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    Magnetic Permeability
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SUMMARY

The discussion focuses on predicting the magnetic permeability of alloys, specifically combinations of iron, nickel, and copper. The user seeks an approximation of permeability values, ideally within a tolerance of ±50%, and expresses interest in how additional metals like zinc, silver, and aluminum may affect these values. The user references the work of Bozorth and a specific PDF document for further insights but ultimately prefers empirical testing over complex calculations to determine permeability. The goal is to maximize permeability using a 75/25 Cu/Ni alloy.

PREREQUISITES
  • Understanding of magnetic permeability and its significance in materials science.
  • Familiarity with alloy compositions, particularly iron, nickel, and copper.
  • Knowledge of empirical testing methods for measuring magnetic properties.
  • Basic grasp of crystal structures and atomic interactions in alloys.
NEXT STEPS
  • Research the empirical methods for measuring magnetic permeability in alloys.
  • Explore the effects of zinc, silver, and aluminum on the magnetic properties of iron-nickel-copper alloys.
  • Study the principles outlined in Bozorth's work on magnetic materials.
  • Investigate the crystal structure analysis techniques relevant to alloy composition.
USEFUL FOR

Materials scientists, metallurgists, and engineers involved in alloy development and magnetic property optimization will benefit from this discussion.

xx0numb0xx
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Is there any way to predict an approximation for the magnetic permeability of an alloy? I imagine that getting accurate results would be near impossible without creating the alloy and then testing it, so I'm looking more for just an order of magnitude (10x) or even a tolerance of maybe ± 50% or less. Specifically, I'm looking for the permeabilities of various combinations of iron, nickel, and copper. It would also be nice to be able to see how additions of other common metals, such as zinc, silver, and aluminum, would affect the permeability of an alloy; although, I think each of those would reduce permeability. My goal is to get maximum permeability with my only source of nickel being a 75/25 Cu/Ni alloy.
 
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Doubtless you've searched Bozorth? I'm away from my copy , but he's all over the 'net.

But I'm no expert. Page 10 of this pdf is plenty to humble me.

http://www3.alcatel-lucent.com/bstj/vol15-1936/articles/bstj15-1-63.pdf
 
jim hardy said:
Page 10 of this pdf is plenty to humble me.

http://www3.alcatel-lucent.com/bstj/vol15-1936/articles/bstj15-1-63.pdf

That really is great work, but I pretty much gave up after page 11. If I'd have to figure out the crystal structure of an alloy, take into account the excess of positive or negative spins of each atom in the unit crystal, figure out how easily these excesses can be paralleled based off of the distance between the atoms, and such, I'd much rather just cast and label samples of different alloys and measure their pulling force on a certain magnet or measure/calculate how much they multiply the inductance of a coil of wire. I didn't want to waste materials on making samples, but if it would be that complicated to calculate the permeability, I'd rather choose the sample method. I appreciate the pdf.
 

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