Submitted by curator on Fri, 10/16/2015 - 14:33
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Inv. 32-21-20
Chisel
A cut from the broken larger end: magnification, 200x
Etchant: Ammonium hydroxide + hydrogen peroxide + alcoholic ferric chloride
(Sn, <0.012%; As, 0.098%; Ni, 0.25%)
The microstructure consists of polyhedral grains that, in their fineness, twinning and distortion, are indicative of treatment by hot-working. Though the direction of deformation is clearly north-south in this micrograph, it actually varies appreciably from area to area in the metal. Fine textured banding is emphasized by the segregated distribution of fine inclusions.
Microhardness VHN: 127 ± 6 (n=5)
Very uniform; what evidence of deliberate working of its squared-off sides will have been lost when this chisel was stripped of its corrosion at some time since excavation.
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