The TTT diagram (fasediagram) of copper is not as complex as for Steel. Steel is an alloy or composite (carbon, nickel, crome etc...)
That makes it complex and the heating and cooling must be quite exact to get the steel ure after.
One could easily soften copper after the milling by heating it up. The question is: Would it serve or worsen the chilling of the die???
Here are two aspects to consider (I bet there is more)
1. Thermal conductivity
2. Softer materials makes better contact with core.
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