Abstract
High strength ultrafine/nanograined aluminum materials with ultimate strength up to 740 MPa and Vickers microhardness up to 2285 MPa were produced using back pressure equal channel angular processing of ultrafine-sized aluminum powder at 400 °C. Microstructure analyses revealed that the attained high strength and microhardness were derived from the presence of nanosized aluminum and γ -alumina grains (5-10 nm) as well as residual amorphous alumina. The interaction between the severe shear deformation and the preexisting amorphous alumina, concurrent oxidation, and amorphous to γ -alumina transition was considered to be responsible for the formation of such a refined and complex nanostructure.
| Original language | English |
|---|---|
| Article number | 031901 |
| Pages (from-to) | 031901-1-031901-3 |
| Number of pages | 3 |
| Journal | Applied Physics Letters |
| Volume | 91 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2007 |
| Externally published | Yes |