Dislocation-free copper: A case history

Deformation studies of initially dislocation-free copper crystals II. Constant strain rate tests on Cr-plated crystals

“…These authors also observed that such resolved shear stresses were much lower than the measured^ macroscopic yield stresses in similar crystals, which were found to lie in the range 60-200 g/mm2. Kamada and Tanner (1974, Part I) and Buckley-Golder (1977 a ) have shown that dislocation-free copper crystals exhibit a low m croscopic yield stress of M 90 g/mm2, three orders of magnitude lower than the theoretically calculated yield stress of 120 kg/mm2 (Kelly 1966). P. B. Hirsch…”

“…'s Daresbury Laboratory on Cr-plated, dislocation-free copper crystals. Czochralski technique discussed a t length elsewhere (Buckley-Golder 1977 b). At all stages during processing the crystals were handled with the utmost care to prevent the introduction of dislocations.…”