Abstract：In order to realize the influence of the ECAP (equal channel angular pressing) to cyclic properties of a material, the bar material of pure copper after multi-pass ECAP is chosen as a study subject and its mechanical behavior under uniaxial tension-compression cycle is investigated by experiment. This research is focus on the change of cyclic behavior of the copper after ECAP. According to the results and observes the conclusions are obtained: (1) The copper treated by ECAP may lead to the transform of cyclic properties from cyclic hardening to cyclic softening; (2) The first pass ECAP has the greatest effect on strengthening of the stress-strain response, the effectiveness of subsequent pass of ECAP will reduce severely and it can be regardless of that for subsequent pass after 4; (3) It has great difference by comparing the stress-strain response between the copper original and ECAPed. The monotonic uniaxial tension stress-strain curve is much higher than the cyclic stress-strain curve for the ECAPed copper, but it is on the contrary for the copper in original state. So it is necessary to evaluate mechanical properties strengthening by ECAP from both the monotonic and cyclic conditions simultaneously.
2013, Vol. 34 
