All Metals Database

Artifact ID BCES 1402/1320
Class amorphous
Material copper-base
Site Ban Chiang BCES
Period Middle Period

Alloy: bronze.
Where Cut: in half
How Mounted: cross-section mounted cut side up
Structure: As-cast.
Metallographic description: An amorphous specimen of unusual structure. One half has rather corroded cored dendrites with numerous voids and nonmetallic inclusions. Large amounts of alpha+delta eutectoid, both corroded and uncorroded, can be seen in this portion. There are numerous voids in this area that are filled with redeposited copper. The other portion contains large globular grains with clear grain boundaries and twins, but no eutectoid or redeposited copper. This second area is quite coppery in color. The line of demarcation, which can be seen with the naked eye, appears to be the result of alloys of distinctly different composition having impinged in the liquid state and adhered to each other. It is not clear which portion of the sample was analyzed compositionally; it may be an average.

Photomicrographs Available

Photomicrographs Database