Submitted by curator on Fri, 10/16/2015 - 12:44
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Inv. 32-21-202
Toggle pin
A cut across the tip: magnification, 400x
Etchant: Klemms III
(As, 2.15%; Sn, 0.47%; Ni, 2.14%)
The surface regions of this artifact have suffered appreciable intergranular corrosion, but the microstructure consists of the remnant sound metal consists of equiaxed, blocky-shaped grains. Twinning in these grains indicates that the metal had had been cold-worked and annealed. The heaviness of that cold-working is apparent in the presence of strain lines within many of the grains, and their significant distortion.
Microhardness VHN: 207 ± 13 (n=5)
Uniform; data scatter (with the VHN ranging 228 to 191) seems to be a genuine record of the variation in the work-induced strain that is visible throughout the pins metal.
NOTE that this was the highest microhardness measured in our Gawra metallurgical study, the mean VHN for the site being 121 ± 34 (n=30).
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