Demagnetise Al Bronze

[123Cat]

Its 10 Al 68 Copper and 4% iron

Turned out more Magnetic than 316

So Can it be removed by electric means

I dont want to heat very high as they are longish bars

Thank You

 

[123Cat]

Let me get the grade , that will help

If its not a low perm grade I fear that is the problem , bad matl selection

 

[dgallup]

Anything that can be magnetized can be demagnetized.

https://www.magnetics.com/products.asp?ProductParent=Demagnetizers

Now if it has to be non-magnetic you will need a different alloy.

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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.

 

[MagMike]

You can wrap a wire around each bar and run a decaying AC current to demagnetize. It'll require trial & error to determine the correct power settings.

 

[MagBen]

What caused your alloy bear magnetism?
If it is annealed/stablized condition, you are having intrinsic magnetism that cannot be removed permanently even by thermal demag.
if it is cold worked/ quenched etc that caused disorder (strain/segregation/Fe rich cluster), and so magnetism, only thermal anneal can remove it.
Both cases, you can do what Mike recommends to de-mag, but only temporarily. When it exposes to an external magnetic field again, it will re-gain magnetism.

 

[123Cat]

Thnks all

A case of wrong matl selection

My $1 coin exibits no reaction to magnet , does not even move a compass

 

[123Cat]

Mag Mike
Thank you

They have a small part machined , that they could try that on

What is it a heavy copper cable and how much current to start ?

We have a small 60 Watt demagnetiser here I could try that

 

[MagMike]

If you have a small part, you won't need heavy copper cable. Try your small 60 watt demagnetizer first.

 

[EdStainless]

If it is a small part your demag unit may work.
But the material is still ferromagnetic, so it will respond to any magnetic field.
In my experience any Cu based alloy with over 2% Fe will be ferromagnetic, below this amount it can be kept in solution.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

 

[123Cat]

Thanks Ed Stainless

Clearer picture of whats happening

Wrong matl selection definite

Will try small part just as experiment