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Artifact ID BC 0720B/918
Class bangle
Material copper-base
Site Ban Chiang BC
Period Late Period

Provenience Status/Description Metallography Elemental/Hardness
Alloy: high-tin bronze
Where Cut: cross section of shaft; four pieces
How Mounted: 4 cross-sections mounted cut side up in same mount
Structure: hot-worked and quenched
Metallographic description: Only islands of metal remain in this bangle fragment. In some areas there are numerous small bits of alpha metal in a sea of corrosion product, in other areas, somewhat less corroded, one can see martensitic needles and grain boundaries in the dark (gamma?)matrix, as well as a (beta?) halo around the alpha particles. A high-tin beta martensite.
BC 0720B/918<br>chord length (largest piece)=2.4 cm inner diameter=5 cm shaft height=0.4 cm shaft width=0.9 cm no decoration
BC 0720B/918<br>chord length (largest piece)=2.4 cm inner diameter=5 cm shaft height=0.4 cm shaft width=0.9 cm no decoration

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