Modeling of Mechanical Properties and High Temperature Wear Behavior of Al7075/SiC/CRS Composite Using RSM

The study focuses on preparing hybrid composites with aluminium alloy strengthened with solid waste Crushed Rock Sand (CRS) and SiC through the stir casting process. The weight portion of reinforcement is diverse from 0 to 6% with a step variation of 3%. The mechanical properties such as hardness, ultimate tensile strength, impact strength, flexural strength, density, and porosity were investigated on prepared composites at room temperature. Central composite design-based response surface methodology (RSM) was espoused for computing and optimizing of the weight percentage of reinforcements considering mechanical properties as responses. An arithmetical model was developed to predict the mechanical properties and the adequacy of the model was verified using analysis of variance (ANOVA). The wear behavior associate with the composite is investigated at 28˚C and 350˚C. The specific wear rate and coefficient of friction of all samples shall be correlated with the above-mentioned temperature state. The maximum density of 2.766 g/cc is recorded for a sample with 3% wt. of SiC. The level of improvement in hardness, tensile strength, impact strength, and flexural strength is 59.7%, 45.9%, 16.9%, 58.7% relative base alloy. The specific wear rate, frictional force, and coefficient of friction decrease with elevated temperature due to the creation of oxide films. The depth and width of grooves at elevated temperatures are smaller.