Research Article

Synthesis and Characterization of Mechanical Properties of AA8014 + Si3N4/ ZrO2 Hybrid Composites by Stir Casting Process

Table 9

Analysis of Variance for microhardness test.

SourceDfSeq SSContribution (%)Adj SSAdj MSF-valueP-value

Regression42156.9424.112156.94539.241.750.176
% of reinforcement198.001.1098.0098.000.320.579
Stir speed (rpm)1364.504.07364.50364.501.180.289
Stir time (min)1696.897.79696.89696.892.260.147
Molten temperature (oC)1997.5611.15997.56997.563.230.086

Microhardness (VHN) = 51.5 + 1.17% of reinforcement − 0.0450 Stir speed (rpm) + 1.244 Stir time (min) + 0.0744 Molten temperature (oC).