Mechanical Properties and Microstructure of Al-17Si-2Fe and Al-6.7Si-2Fe functionally Graded Alloys by Sequential Casting

A C TInternal combustion engines suffer from many problems in their parts due to service, which leads to a decrease in efficiency.This may be due to bade working conditions.One of the important parts is piston.In many applications, it suffers from several problems, including pitting in the piston surface, which leads to the loss of some of its parts and thus leads to failure.It is usually made of aluminumsilicon alloys in different proportions.This research proposed a way to improve the performance of piston by modifying the chemical composition of the alloy and manufacturing method.It was suggested to add iron at a rate of 2% to form a ternary alloy and to manufacture it using the method of graded functional materials through successive casting.This method led to the integration of two alloys into one part where the surface is made of Al-17Si-2Fe alloy and the lower part is made of Al-6.7Si-2Fe alloy.Microscopic examination and mechanical properties of the alloys used were conducted.