| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1580862 | Materials Science and Engineering: A | 2010 | 6 Pages |
The influence of cooling rate after homogenization on the flow behavior of aluminum alloy 7050 was investigated by hot compression testing over a range of temperatures, 300–450 °C, with strain rates of 0.001–1 s−1. It was found that water-quenched alloy exhibited higher flow stresses than furnace-cooled alloy, and the difference in the peak stress decreased with temperature increasing. The strain-hardening rate during the initial stage of hot deformation was higher for water-quenched alloy than furnace-cooled alloy. During deformation at low temperatures with the lowest strain rate, flow softening was observed for both alloys, but this effect was more significant for the water-quenched alloy. The activation energy of the water-quenched alloy was more than twice higher than that of the furnace-cooled alloy. With strain increasing, the activation energy decreased for both alloys. These phenomena were explained based on dynamic precipitation and coarsening during hot deformation according to microstructure examination.
