Submitted by curator on Fri, 10/16/2015 - 13:54
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Inv. 31-52-274
Balance plate with four holes
A cut from the fragmented edge: magnification, 100x
Etchant: Klemms III
(Sn, 0.11%; As, 0.88%; Ni, 0.15%)
The microstructure consists of polyhedral grains that, in their twinning and distortion, are indicative of an annealing treatment after a cold-working that was particularly heavy at the artifacts edge (at right here). There is a light scatter of small sulfide-like inclusions throughout the metal.
Microhardness VHN: 110 ± 7 (n=5)
Uniform, though the VHN range (129 to 95) is evidence for slightly heavier working closer to the artifacts edge.
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