抄録
Pure aluminum (1050) processed by ECAP (Equal-Channel Angular Pressing) and subsequent annealing treatment was subjected to tensile tests to investigate characteristic features of yielding behavior. Dependences of the annealing and test temperatures on the yielding behavior were examined in terms of stress drop and yield point elongation. Relationship between the yield point elongation and geometric configuration of Luder's band was also discussed in detail. Temperature of the annealing treatment had a large influence on the initiation of yielding; steep stress drops and marked yield point elongations occurred for the annealing temperatures at about 530K. Ability of the strain hardening was decreased with increasing the test temperature during the tensile test, while there was no relationship between the stress drop and the testing temperature. Luder's band became shallow with increasing the annealing temperature. The increased ability of the strain hardening due to grain growth led to the formation of Luder's bands that were shallow and easy to propagate.
