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Artifact ID BC 0633/770
Class wire/rod
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, two cuts
How Mounted: 2 pieces:one cross-section, one lengthwise in same mount.
Structure: Hot-worked and quenched.
Metallographic description: View A (lengthwise segment): At first glance, this appears to be a somewhat atypical quenched high-tin martensitic structure, but further examination suggests that the "needles", which appear only on the edges, could also be mechanical twins of tin. PIXE analysis confirmed that this was a high-tin bronze. There is a great deal of broken- up alpha, both inter- and intra- granularly, within a dark, almost featureless matrix, probably of gamma. Many of the grains are outlined by alpha. View B (cross-section): same appearance. In neither view is there flattening or unidirectionality of the alpha.

Photomicrographs

BC 0633/770<br>Total length of all pieces=6.8 cm. Cross section diameter=0.6 cm. Round cross section.
BC 0633/770<br>Total length of all pieces=6.8 cm. Cross section diameter=0.6 cm. Round cross section.

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