| Abstract |
| Microstructure and hardness changes of the Cu-35%Zn alloy prepared by equal-channel angular pressing (ECAP) with different feed directions were examined. Two different feeding methods such as A (parallel passes) and C (180° rotation after each pass) were employed and the relationship between the microstructure and the hardness was investigated. Shear bands with 45 degree on transverse direction and twins were observed after ECAP. Relative amount of twins to shear band on the microstructure decreases with number of ECAP passes, suggesting that dislocation banding is the primary strengthening component although twinning is contributory to strengthening. The parallel ECAP pass (route A) gave finer shear band and higher hardness increase than the 180°rotated ECAP pass (route C), which is in sharp contrast with that observed in Al with a high stacking fault energy. Reversible movement of dislocations in planar slip bands due to the low stacking fault energy is thought to be linked with the lower hardness in route C. (Received October 6, 2003) |
|
|
| Key Words |
| Equal channel angular pressing, Stacking fault energy, Cu-35% Zn, Deformation band, Twin, Feed direction |
|
|
 |
|
