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<p>[QUOTE="NSP, post: 3375198, member: 74849"]Thanks for sharing the article. I found the copper/silver solubility issue to be particularly interesting, so I looked up a phase diagram.</p><p><br /></p><p>[ATTACH=full]895279[/ATTACH]</p><p><br /></p><p>It’s been a while since I’ve tried to read one of these things, but it appears that if you’re trying to make a silver/copper alloy that’s mostly silver (and only have one phase), you’d want to make the β phase (on the right). It looks like the most copper that can be dissolved in silver is 8.8% (100% - 91.2%), and even that would be at 779 °C. Copper is even less soluble as the temperature drops. If too much copper is added, you move into the region where two phases are present: α + β. This would be consistent with what the mint reported.[/QUOTE]</p><p><br /></p>
[QUOTE="NSP, post: 3375198, member: 74849"]Thanks for sharing the article. I found the copper/silver solubility issue to be particularly interesting, so I looked up a phase diagram. [ATTACH=full]895279[/ATTACH] It’s been a while since I’ve tried to read one of these things, but it appears that if you’re trying to make a silver/copper alloy that’s mostly silver (and only have one phase), you’d want to make the β phase (on the right). It looks like the most copper that can be dissolved in silver is 8.8% (100% - 91.2%), and even that would be at 779 °C. Copper is even less soluble as the temperature drops. If too much copper is added, you move into the region where two phases are present: α + β. This would be consistent with what the mint reported.[/QUOTE]
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