Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1576745 | Materials Science and Engineering: A | 2012 | 7 Pages |
The flow stress behavior of the nanometric Al2O3 particulate reinforced Al alloy matrix composites were investigated in the temperature range from 360 to 480 °C, with strain rates of 0.001–1 s−1 on Gleeble-1500 machine. The results show that the flow stress increases with increasing strain rate and decreasing temperature. The flow stress of this deformed composites shows a dynamic recovery character in the temperature range from 360 to 440 °C and in the strain rate range of 0.001–0.01 s−1, while that deformed at 480 °C shows dynamic recrystallization character. The processing map at the strain of 0.4 is obtained and exhibits three safe deformation domains: 360–400 °C at 0.001–0.01 s−1, 400–440 °C at 0.001–1 s−1, and 440–480 °C at 0.001–0.01 s−1. According to the processing map and microstructure observation, the optimum hot-working parameters are determined to be 480 °C/0.001 s−1.