Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9796382 | Materials Science and Engineering: A | 2005 | 7 Pages |
Abstract
Up to now, investigations for the effect of the severe plastic deformation on mechanical properties of the processed materials are not enough. In the present work, tensile properties of a cast Al-11Â mass% Si alloy processed by rotary-die equal-channel angular pressing (RD-ECAP) with 4-32 passes were investigated at room temperature. Elongation to failure significantly increased with the number of RD-ECAP passes from 4 to 32. For example, the sample pressed 32 passes has 10 times higher elongation (â¼15%) than the as-cast alloy (â¼1.5%). These results show that the cast Al-11Â mass% Si alloy was transformed into a ductile alloy by RD-ECAP. Yield strength was noticeably improved by first four passes of RD-ECAP (about 40%) compared with that of the as-cast alloy. Fine-grained microstructure of the aluminum alloy matrix (about 300Â nm) and modified grain boundaries after RD-ECAP is the primary reason for exhibiting significant ductility of this alloy. Grain boundary sliding (GBS) occurred at the room temperature tensile testing in the RD-ECAPed sample. The plastic deformation and fracture mechanism of the cast Al-11Â mass% Si alloy were markedly changed by RD-ECAP.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Aibin Ma, Naobumi Saito, Makoto Takagi, Yoshinori Nishida, Hiroyuki Iwata, Kazutaka Suzuki, Ichinori Shigematsu, Akira Watazu,