| Title |
Microstructure of Cu-9Fe-1.2Cr Ultrafine Composites Produced by Equal Channel Angular Pressing |
| Authors |
주기하(Ki Ha Ju); 홍순익(Sun Ig Hong); 김형섭(Hyoung Seop Kim) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Equal channel angular pressing; Micorcomposite; Twin; Shear Direction |
| Abstract |
In this study, equal channel angular pressing (ECAP) was carried out on Cu-Fe-Cr microcomposites at room temperature. The microstructure and mechanical properties of the specimens pressed at different ECAP routes were investigated. All specimens pressed at different routes showed ultrafine-grained microstructures with the shape and distribution of Fe-Cr phase dependent on the processing routes. As the number of pressing increased by route A, the intial dendrite of Fe-Cr phases were elongated along the shear direction and developed into filaments. On the other hand, as the number of pressing increased by route Sc and route C, the initial dendrites became finer by fragmentation with no pronounced change of the shape. The comparison of the hardness between wire drawn Cu-Fe-Cr and ECAP-ed Cu-Fe-Cr showed that wire drawing was more effective in increasing the hardness than ECAP. More effective microstructural refinement due to the decrease of the interfilammentary spacing with increasing drawing strain is thought to be responsible for much faster increase of hardness during wire drawing. (Received October 6, 2004) |