| 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. |
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| Key Words |
| ECAP, 2024 Al alloy, S` phase, Microstructure, Subgrain |
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