Research Article
[Retracted] Synthesis, Mechanical, and Tribological Performance Analysis of Stir-Casted AA7079: ZrO2 + Si3N4 Hybrid Composites by Taguchi Route
Table 7
Experimental summary of Vickers hardness test.
| Exp. runs | % of reinforcement | Agitation speed (rpm) | Agitation time (min) | Molten temperature (°C) | Vickers hardness (VHN) |
| 1 | 0 | 450 | 15 | 700 | 107 | 2 | 0 | 500 | 20 | 750 | 99 | 3 | 0 | 550 | 25 | 800 | 112 | 4 | 0 | 600 | 30 | 850 | 110 | 5 | 4 | 450 | 20 | 800 | 114 | 6 | 4 | 500 | 15 | 850 | 108 | 7 | 4 | 550 | 30 | 700 | 115 | 8 | 4 | 600 | 25 | 750 | 118 | 9 | 8 | 450 | 25 | 850 | 120 | 10 | 8 | 500 | 30 | 800 | 121 | 11 | 8 | 550 | 15 | 750 | 117 | 12 | 8 | 600 | 20 | 700 | 113 | 13 | 12 | 450 | 30 | 750 | 122 | 14 | 12 | 500 | 25 | 700 | 116 | 15 | 12 | 550 | 20 | 850 | 121 | 16 | 12 | 600 | 15 | 800 | 115 |
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