Studying the influence of rolling deformation degree and Pb content on the hardness of spray deposited Al–6Si alloy using linear regression analysis

Abstract

In this study, Al–6Si alloys with various Pb content (0, 10, 20, and 30 wt.%) were prepared by the spray deposition technique. Gaussian or bell-shaped spray deposits were obtained for different Al–6Si–xPb alloys at a pressure of 10 bar, at a nozzle to substrate distance of 450 mm, delivery tube with a diameter of 4 mm with a substrate inclination angle of 0°. Spray deposited Al–6Si–xPb alloys with variable Pb content were subjected to different rolling deformation. For the hardness measurements, samples were cut from the central and peripheral regions of the deposit containing different percentages of lead content. This paper examines the effect of deformation degree during different rolling reductions and the lead content of the spray deposited aluminum-silicon alloy on hardness behavior through the linear regression technique. A factorial design analysis was conducted to study the effect of different parameters, such as percentage of rolling deformation, variation of the lead composition, and preform distance from center to the periphery of the spray deposit. The influence of different rolling deformation on hardness values was more pronounced relative to that of the distance from the center to the peripheral region of the aluminum-silicon spray deposit with lead content. The hardness largely depends on the rolling deformation degree. Hardness values of the deposits were noted to increase with a higher deformation degree of the deposit, but it decreased as the Pb content increased.