PLASTIC DEFORMATION OF IRON SINGLE CRYSTALS UNDER SIMPLE SHEAR.

Observations were made on the plastic deformation of iron single crystals subjected to the simple shear on the single and multiple slip systems to examine work hardening behavior. When the applied shear stress was matched to the single slip systems, the easy glide in stage I was observed in the stress-strain curves. On the other hand, when the applied shear stress coincided with the multiple glide system, the linear hardening in stage II was clearly recognized from the early stage of deformation. To examine the work hardening mechanisms, the strain rate-cycling tests were performed on crystals in easy glide and linear hardening regions and the average effective and internal stresses were estimated as a function of strain in these regions.