Photomicrograph Database

Artifact ID BC 0652/0912
Negative Number NS115
Magnification 400x
Etchant K2Cr2O7, FeCl3
Photo Date 2/29/2000

Photomicrograph Description

Closeup of area of grain formation and intergranular corrosion.

Alloy

bronze or copper

Structure

As-cast.

Metallographic Description

Dendritic with grain boundaries forming and a good deal of shrinkage voiding and interdendritic corrosion. Some mechanical twins or strain markings can be seen at high magnification, suggesting that there was some plastic deformation after casting. Cast, fairly slow cooling, a little work or post-production stress of some kind.




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