Abstract
A simple model was developed to correlate the plastic energy dissipated in microindentation to the applied load and the average dislocation density underneath the indentation. The model predicted that the plastic energy dissipated in a loading-unloading cycle was proportional to the 3/2 power of the indentation load as well as to the 3/4 power of the average dislocation density underneath the indentation. The experimental results from the microindentation tests of the annealed Al and the equal channel angular extrusion (ECAE)-deformed Al supported the proposed model. A variation of the microhardness to the various sections of the ECAE-deformed Al was observed, suggesting that the Al rod was deformed to varying degrees of plastic deformation after only a single ECAE pass. The hardness of the most severely deformed sample showed the highest hardness, and the annealed sample showed the lowest hardness. Also, plastic recovery was observed in the indentation of the ECAE-deformed Al, which suggested a kind of Bauschinger effect took place.
| Original language | English |
|---|---|
| Pages (from-to) | 3323-3328 |
| Number of pages | 6 |
| Journal | Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science |
| Volume | 35 A |
| Issue number | 10 |
| DOIs | |
| State | Published - Oct 2004 |
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanics of Materials
- Metals and Alloys