The photomicrograph at left was taken at 200X; the one below, at 500X.
Note the severe coring.
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This gold-copper alloy casting was made in South America by
pre-Columbian Indians. The photomicrograph at left was taken at 200X; the one below, at 500X. Note the severe coring. |
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The gold-copper
phase diagram shows a continuous series of solid solutions with a
minimum melting point near 50 atomic percent. |