Recent developments in powder metallurgy based aluminium alloy composite for aerospace applications

In this paper, the primary synthesis and secondary treatment of Aluminium matrix composites (AMCs) has been reviewed. The renewed quest for component materials with high strength-to-weight ratio, u...

A review on primary synthesis and secondary treatment of aluminium matrix composites

A review and assessment of effect of cutting fluids

Investigations on mechanical behavior of hot rolled Al7075/TiO2/Gr hybrid composites

Effect of graphite on aluminium matrix composites fabricated by stir casting route – A review

Study on mechanical properties of graphite particulates reinforced aluminium matrix composite fabricated by stir casting technique

Optimization of friction welding parameters on aluminium 7068 alloy

Electroless nickel boron (ENi-B) coatings have been used in various applications because of their high hardness and wear resistance characteristics. In this study, the independent variable concentrations of nickel, reducing agent and stabilizer, influencing the hardness of the deposits was optimized by central composite design (CCD) of response surface methodology (RSM) and Taguchi technique (TT). Taguchi L9 orthogonal array (OA) was employed to develop the experimental runs. The optimum process parameters were identified by utilizing the signal-to-noise (S/N) ratio computed for the hardness as per ’’the-larger is better” approach. From the response table for S/N ratio, it was identified that reducing agent’s contribution was more for the hardness of the ENi-B deposit, when compared to the nickel ion and stabilizer concentrations. From CCD the optimum source of nickel ion, stabilizer and reducing agent concentrations were found to be 29.92, 31.63 and 0.78 g/L with the maximum hardness of 591 HV. The optimum values were confirmed by the experiments, the maximum hardness achieved between CCD and TT did not show a significant variation in hardness. Therefore, it is concluded that CCD may be more promising in identifying the response, by developing a mathematical model that directly relates the process parameters and hardness over the Taguchi technique. 

Optimization of process parameters using central composite design and Taguchi method to improve hardness in ENi-B coatings: A comparative approach

Process Modeling and Intuitive Search Based Optimization of Average Surface Roughness in Citrate Stabilized Electroless Nickel-Boron Coatings

In the electroless nickel-boron coating process, surfactant helps to minimize the surface tension between the substrate and the electrolyte in the bath. Despite, its high cost and the formation of micelles from monomeric surfactant molecules at its critical micelle concentration (CMC), it is essential to optimize the concentration while using in the bath. In this study, to solve this problem, mathematical models are developed using regression and artificial neural network (ANN) techniques to relate the concentration of amphoteric surfactant (0-0.162 g/L) as an independent variable and microhardness as a dependent variable. Then, the developed model was used to optimize microhardness at CMC using a genetic algorithm (GA). The goodness of fit of the models was evaluated using the coefficient of determination (R2). The ANN model was found to be the best fit with R2 = 0.99. The maximum microhardness of 852 HV was achieved at the CMC of 0.064 g/L, from the GA using the validated model as a fitness function.

M.S. Vijayanand

Papers

Study on mechanical properties of graphite particulates reinforced aluminium matrix composite fabricated by stir casting technique

Optimization of friction welding parameters on aluminium 7068 alloy

Optimization of process parameters using central composite design and Taguchi method to improve hardness in ENi-B coatings: A comparative approach

Process Modeling and Intuitive Search Based Optimization of Average Surface Roughness in Citrate Stabilized Electroless Nickel-Boron Coatings

Modelling and Optimization of Amphoteric Surfactant Concentration in Electroless Nickel Boron Coatings for Maximum Microhardness