Photomicrograph Database

Artifact ID DK 0155/0331
Negative Number NS234
Magnification 100x
Etchant AH/HP, FeCl3
Photo Date 7/14/2000

Alloy

high-tin bronze

Structure

As-cast.

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 Widmanst├Ątten structure in the eutectoid. This is a high-tin piece that was cooled relatively slowly.




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