Research Article
Manufacturing of Nanostructured Rings from Previously ECAE-Processed AA5083 Alloy by Isothermal Forging
Table 4
Microhardness for the material samples after the ring isothermal forging.
| Position | 200°C | 250°C | 300°C | Central zone | Upper zone | Central zone | Upper zone | Central zone | Upper zone |
| (0,0) | 131.5 | 124.1 | 109.3 | 107.8 | 95.6 | 108.3 | (0,1) | 131.1 | 129.2 | 110.1 | 119.8 | 105.0 | 106.9 | (0,2) | 137.7 | 128.9 | 110.2 | 113.3 | 105.7 | 105.5 | (0,3) | 132.2 | 126.0 | 112.3 | 107.2 | 105.2 | 101.0 | (0,4) | 136.6 | 127.4 | 112.8 | 110.0 | 111.5 | 108.7 |
| Mean | 133.82 | 127.12 | 110.94 | 111.62 | 104.60 | 106.08 | Standard deviation | 3.09 | 2.12 | 1.52 | 5.16 | 5.71 | 3.11 |
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