Microstructure and Porosity Behavior of Spray Formed Al Alloy Processed by Cold Rolling

An efficient spray forming technique was utilized to cast Pb-added Al-Si alloys. It was then rolled to a different percentages (0–80%) using rolling machine and microstructural characteristics as well as porosity behavior of casting alloy were systematically studied. It is noteworthy that the distribution of Pb was nearly uniform all through the aluminum phase and it was mainly at the grain boundary. Also, the grains of aluminum were found to be elongated along the rolling direction after 80% rolling. Porosity was minimum at peripheral region of the deposit and it decreased as rolling percentage is increased.