Author Topic: Aluminum Copper Alloy Experiment  (Read 14015 times)

Offline NormanV

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Re: Aluminum Copper Alloy Experiment
« Reply #50 on: May 16, 2017, 10:52:31 AM »
Ok, thanks for the quick response Andrew. When it's cooled down enough to handle I'll put it back in the kiln to heat treat it and try machining it this evening.

Offline NormanV

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Re: Aluminum Copper Alloy Experiment
« Reply #51 on: May 18, 2017, 10:15:54 AM »
Well, I did the heat treatment, I heated it until it just started to melt and then dunked it in water.
I machined it today, it cut quite well but I noticed that the surface that I achieved was not as good as the sample that Steve showed earlier in this thread. On close examination I saw that I am getting lots of tiny bubbles. I have said previously that I do not de-gas. Next time I melt some metal I will try it to see if it makes a difference for me.

Offline Biggles

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Re: Aluminum Copper Alloy Experiment
« Reply #52 on: May 19, 2017, 09:27:21 PM »
If you really want a hard alloy try Beryllium with Copper. Itís used to cover expensive golf clubs and can be used for armour piercing bullets!

Offline NormanV

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Re: Aluminum Copper Alloy Experiment
« Reply #53 on: May 25, 2017, 11:15:14 AM »
I did a little experiment today, not precise but it gave a ball park comparison of the aluminium/copper alloy and the normal alloy that I use that is car wheels melted down.
I used a centre punch and a club hammer. I arranged it so that the club hammer dropped a repeatable distance onto the centre punch and then measured the resulting punch mark using a magnifier. The copper alloy gave a punch mark 1mm dia and the plain alloy 2mm dia.
I can deduce from this that the addition of copper results in a harder alloy. :)

Offline awemawson

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Re: Aluminum Copper Alloy Experiment
« Reply #54 on: May 25, 2017, 11:35:13 AM »
 :clap:
Andrew Mawson
East Sussex

Offline Pete W.

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Re: Aluminum Copper Alloy Experiment
« Reply #55 on: May 25, 2017, 03:02:54 PM »
If you really want a hard alloy try Beryllium with Copper. Itís used to cover expensive golf clubs and can be used for armour piercing bullets!
 

Years ago, I had occasion to visit an aircraft company in the UK midlands.  There was a detached laboratory on the site, surrounded with a tall security fence.  Occasiomally, one or two of the staff could be seen outside the building, all clad in 'space suits'.  On enquiring of our hosts 'what's that all about?' we were told 'that's the Beryllium research department'.  My understanding is that beryllium's not very nice stuff, even alloyed (e.g. beryllium copper) or in the ceramic form (beryllia) used for semiconductor heat-sinks. 
Best regards,

Pete W.

If you can keep your head when all about you are losing theirs, you haven't seen the latest change-note!

Offline vtsteam

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Re: Aluminum Copper Alloy Experiment
« Reply #56 on: May 28, 2017, 09:19:21 PM »
Good work Norman! And I like the sound of your test results. :beer:
I love it when a Plan B comes together!
Steve
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Offline Biggles

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Re: Aluminum Copper Alloy Experiment
« Reply #57 on: May 29, 2017, 08:09:49 PM »
I didnít realise it was that bad Pete as they have it as a coating on several things. Perhaps itís the heating process and vapours that are bad. :doh:
Well done Norman, bypass Beryllium then. :headbang:

Offline Pete W.

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Re: Aluminum Copper Alloy Experiment
« Reply #58 on: May 30, 2017, 05:16:54 AM »
I didnít realise it was that bad Pete as they have it as a coating on several things. Perhaps itís the heating process and vapours that are bad. :doh:
Well done Norman, bypass Beryllium then. :headbang:

Have a look here:  https://www.ccohs.ca/oshanswers/diseases/beryllium.html 

I chose that one at random from from the Google response to the phrase 'Beryllium health risks?'  There were lots more. 
Best regards,

Pete W.

If you can keep your head when all about you are losing theirs, you haven't seen the latest change-note!

Offline Biggles

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Re: Aluminum Copper Alloy Experiment
« Reply #59 on: June 11, 2017, 01:18:31 AM »
Oh! i havent touch any that i know off. Better keep clear of that stuff then.  :bugeye:

Offline seadog

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Re: Aluminum Copper Alloy Experiment
« Reply #60 on: June 11, 2017, 05:59:49 PM »
It's used in dental plate manufacture so it's not that bad in certain applications. Dust or fumes are the real problem as I see it. We were warned back in the 70s about the risks since we had RF transistors that used Beryllia. In fact most kitchens have Beryllium present. The magnetron in your microwave cooker will have a Beryllia ceramic as the insulator. It's used because of its superior thermal conductivity.

Offline vtsteam

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Re: Aluminum Copper Alloy Experiment
« Reply #61 on: June 12, 2017, 10:18:09 AM »
The use recommended against here was casting with it, or use in our home workshop, if unaware of the hazard.

If you're already in the business of making dental plates, old style RF transistors, or microwave insulators, then just ignore, you probably already know about the hazards.
I love it when a Plan B comes together!
Steve
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Offline Biggles

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Re: Aluminum Copper Alloy Experiment
« Reply #62 on: June 13, 2017, 09:57:59 AM »
 :nrocks:

Offline NormanV

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Re: Aluminum Copper Alloy Experiment
« Reply #63 on: June 21, 2017, 12:26:11 PM »
I wasn't planning on using Beryllium as I have no idea where to get it.
One thing that I have found is that aluminium with the addition of copper in the cast, machines much more cleanly whether or not given heat treatment. That will be standard for me from now on. One problem though is that it work hardens. My milling machine only has hand feed and if I go too slowly the pressure required to turn the handle increases dramatically. If I turn the feed handle briskly I find that it will cut its way through the metal quite cheerfully. This is using a 20mm cutter with a 2mm depth of cut, 15mm wide at 1000RPM on my homemade milling machine. I judge the feed rate to be 150mm per minute. Is this good or bad?

Offline vtsteam

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Re: Aluminum Copper Alloy Experiment
« Reply #64 on: June 22, 2017, 09:53:46 AM »
Interesting to hear, Norman. I haven't machined my Al/Cu recently (or anything else except a cast tractor head). Been away from the machine shop (AFMS?). But being back here reading MM and finally finished with the waterball cistern project, I'm beginning to get the machining itch again. I do wonder whether the AlCu properties have increased over time -- if aging has maade it tougher. Will have to find out soon.

Sorry, don't know what best feeds and speeds would be for this homemade stuff. But probably somebody more professional here does.
I love it when a Plan B comes together!
Steve
www.sredmond.com