Photomicrograph Database

Artifact ID DK 0155/0331
Negative Number NS235
Magnification 400x
Etchant AH/HP, FeCl3
Photo Date 7/14/2000


high-tin bronze



Metallographic Description

Only islands of metal are left in this piece. The structure is unusual for a high-tin specimen--according to the EDAX, this contains 20% tin. Islands of alpha, occasionally twinned, sit in a matrix of coarse alpha+delta eutectoid, . There are no martensitic needles, but in addition to the large dendritic blobs of alpha, there are many small rods of alpha in a Widmanstätten structure in the eutectoid. This is a high-tin piece that was cooled relatively slowly.

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