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How to harden copper

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facium   

Copper is different, it will be soft after annealing regardless of air cooling or quenching. How hard copper will be after annealing (hard, half hard, dead soft) depends on how hot you get it.

I think there has been a slight misunderstanding about copper returning to hard if air cooled. Some (but not all) non-ferrous metals do need to be quenched to soften them (Silver need to be held at temp over time, then quenched). If you let them air cool (4 hours?) then they would still be hard, but the original question was about copper.

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Work hardening is the only way--hammering, stretching, rolling, etc.

Beryllium copper alloys are precipitation hardening, and can be heat treated for higher hardness. 600°F-750°F for 1-2.5 hours depending on which alloy, and requirements needed.

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Frosty   

Lay a speaker on it's back and lay your pieces on it with a bunch of coins. Play loud window rattling music. Given time it'll harden copper alloys nicely.

Frosty The Lucky.

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Mbmul175   
On 08/06/2016 at 6:20 AM, Frosty said:

Lay a speaker on it's back and lay your pieces on it with a bunch of coins. Play loud window rattling music. Given time it'll harden copper alloys nicely.

Frosty The Lucky.

Won't this 100% mess up my speakers ?

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Frosty   

Leave the covers on the speakers, you don't want stuff rattling around on the cones. Don't turn them to destroy my speakers volume.

Another way is to put them in a box or metal bucket in the trunk of your car and do some gravel road driving. Stop when they're hard enough.

Frosty The Lucky.

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JHCC   
1 hour ago, tanvir said:

How can I harden 98.97% copper with Zr and Cr as trace elements

Permanently submerge it in a bath of liquid nitrogen. 

Oh, did you want a practical solution? Well, you'll have to tell us how big a piece, what it's to be used for, what kind of stress and wear it will be subjected to, and so on. 

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Work hardening; including ultrasonic hardening; some thermal methods; depends on what you are trying to do.

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Frosty   

Wallnut shell blasting won't remove material though an ultrasonic cleaner might do it for you.

Frosty The Lucky.

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