Photomicrograph Database

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Artifact ID BC 0713/0893A
Negative Number NS129
Magnification 600x
Etchant AH/HP
Photo Date 3/20/2000

Photomicrograph Description

High-magnification showing tiny grains with strain lines and other signs of working.

Metallographic Description

At 100x, the structure is of highly corroded cored dendrites. Blue-gray inclusions are concentrated in the interdendritic zones and in the shrinkage and corrosion voids. Twinned redeposited copper can be seen in some voids. At 600x, the metal becomes a mosaic of tiny grains filled with strain lines and twins. Some of the twins are bent. Grain size varies and working is more evident near the edges.




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