Thread: castting
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[email protected] edhuntress2@gmail.com is offline
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On Thursday, April 20, 2017 at 4:01:48 PM UTC-4, Tim Wescott wrote:
On Thu, 20 Apr 2017 17:33:33 +0100, David Billington wrote:

On 20/04/17 06:29, wrote:
I am research student I need any one interest in casting of copper base
alloy or high copper alloy with chrome in different ratios (0.46 - 5)%
chrome and copper base alloy with aluminum in different ratios (3 -9)%
Al ,I need know how can cast of chrome in molten copper that has 1907 C
temp whereas the copper 1085 C, can I add chrome to molten copper as
powder? Did the chrome dissolved in molten copper.
then I will try to make solution treatment to these alloy for
strengthening (quenching and aging) to ...then I will to compare
between these alloy with mechanical properties, corrosion and wear
resistance. Please if you any one can help me to achieved these
requirements. Did the copper chrome alloy has more than properties from
copper aluminum alloy with the ratios above Thank with my regards

You would need to know the solubility of chrome in copper to know how
much you can add but modern pewter (Britannia metal) is made by melting
tin and then adding the copper and stirring to dissolve the copper.
Copper has a much higher melting temperature than tin but will readily
dissolve up to a point.


I did a bit of searching and based on the little bits I found it seems
they're imiscible.

I was hoping to find a master chart of the solubilities of all metals in
all metals -- I was disappointed.

--
Tim Wescott
Control systems, embedded software and circuit design
I'm looking for work! See my website if you're interested
http://www.wescottdesign.com


Copper and chromium are not miscable, but they are somewhat soluble, and there is a whole class of copper/chromium alloys:

https://www.copper.org/resources/pro.../chrom_cu.html

When the alloy is cooled, the chromium either goes into solid solution (fast quench) or it precipitates out (slow quench). The usefulness of the alloy depends upon further heat treatment, which allows a fine matrix of chromium to precipitate out of the alpha copper, resulting in a very strong, precipitation-hardened alloy.

You probably can find more by looking up the individual Copper Assn. alloy numbers, which are listed in the article linked to above.

Corrosion resistance of precipitation-hardened alloys typically is not very good, but I have no idea about this pair.

As for the aluminum, I'd start with the big handbooks from the American Society for Metals. I can look it up but it's worthwhile for the OP to make himself familiar with the resources. This is pretty obscure stuff and you have to find your way around the basic references if you're going to get anywhere with complex and obscure questions such as these.

--
Ed Huntress