| Title |
The Microstructure of ECA Pressed 2024 Al Alloy according to Deformation Amount |
| Authors |
김선화(Seon Hwa Kim); 최용락(Yong Lak Choi); 이갑호(Kap Ho Lee) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
ECAP; 2024 Al alloy; S` phase; Microstructure; Subgrain |
| Abstract |
2024 Al alloy was severely deformed by equal channel angular pressing (ECAP) to obtain an ultra-fine grain structure. The relationship between the grain size and deformation amount was investigated by high resolution TEM. The shape of S` phase was observed to identify the effect of severe plastic deformation. As the deformation amount increased, the grain size decreased, but after 1 pass, the decrease of grain size was small. The grain structure was changed from irregular into equiaxed. After 6 pass, the grain size of the specimen was about 100 nm, and the size of S` phases was about 10 nm. The morphology of S` phases was changed to spherical from rod-type by severe plastic deformation. |