Photomicrograph Database

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Artifact ID BC 0720B/0918
Negative Number NS277
Magnification 100x
Etchant AH/HP, FeCl3
Photo Date 12/1/2000


Alloy

high-tin bronze

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.


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