| dc.description |
99.15 pure zinc, when rolled at room temperature to reductions in
excess of 50cp, shows properties grouped under the general title of
'extended plasticityl . At these reductions, the flow stress and
elongation show an increasing strain-rate sensitivity, and at 8 reduction,
at which most of the tests reported here were done, the conventional lar7e
twinned. Grains were converted to a stable sub-grain structure 2-3 microns
in diameter. This structure remains apparently unchanged after about 120;'
elongation in uniaxial tension; no Evidence of slip or twinning has so far
been observed under the electron microscope.
Work to elucidate the deformation mechanism is continuing. |
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