Investigation of the micro ecm characteristics on machining of aluminium nano composite

Abstract

In this work, synthesis and Micro Electro Chemical Machining (and#956;ECM) of aluminium alloy (AA7075) reinforced with nano silicon carbide (nSiC), nano Aluminium oxide (nAl2O3) also nano Boron carbide particles (1.5 wt. %) have been effectively investigated and reported. Characterization of AA7075+x%nSiC was also investigated to determine their mechanical properties such as tensile strength, micro-hardness, impact strength, wear and corrosion resistance for different compositions (0%, 0.5%, 1%, 1.5%, 2% and 2.5%). The ultrasonic cavitation-based solidification process was employed for fabricating the nanocomposite, and machining studies were performed based on the experimental design matrix formulated using the central composite approach of Response Surface Methodology (RSM). The parameters which were applied to study their effects are: voltage, the concentration of electrolyte, duty cycle, and rate of tool feed with an objective of optimizing Material Removal Rate (MRR), radial overcut, surface roughness and wear on tool electrode. Multi-Objective optimization was performed with desirability analysis. A second-order empirical equation was formulated for all outputs. The most influential input parameters were recognized by applying the Analysis of Variance (ANOVA). An evolutionary Teaching-Learning-Based Optimization (TLBO) algorithm was also performed considering surface roughness as a constraint, to compare the results with desirability analysis. newline