چكيده به لاتين
Abstract:
Nowadays, functionally graded materials has different applications. Functionally graded
materials are widely used by various industries, such as Aerospace industry, turbomachinery, coating industry, energy storage systems, etc. due to their unique property in providing multiple and sometimes opposite properties in a material volume. The microstructure and chemical composition of the functionally graded materials have a variable distribution in the material volume that leads to multiple properties of the material. Hence, the production of functionally graded material sheets that provide such a structure is of particular importance. Although, various methods have been developed for producing functionally graded material sheets, there is still no optimal method in this field. The purpose of this study is to produce functionally graded material sheet of aluminum with SiC reinforcement, using powder metallurgy and hot rolling methods. In this regard, the amount of reinforcement in the direction of thickness has been changed from the value of 0 to 4 weight percent. The samples were prepared in 4 steps including ball-milling, degassing, cold pressing and sintering, and then were hot-rolled in three passes. The microstructure of the obtained samples, including the size of the grains in the rolling direction and perpendicular to it and also the distribution of the particles were evaluated using optical microscope. In addition, the mechanical properties ofthe FGM samples including their hardness, tensile strength and flexural strength were measured and reported in the third pass. In the fourth chapter, the results of the ball-milling process at different times were discussed and their graphs were presented. Then, the results of the microstructure, hardness, tensile and flexural tests were reported, and the comparison of the results between the experimental test and the finite element method was presented. Finally, the fracture surfaces in the tensile and flexural tests were investigated. According to the images obtained from the microstructure of the samples, the reinforcing particles have an acceptable distribution in the matrix phase. Also, the results indicate that the hardness and strength are enhanced by increasing reinforcing particles and the number of rolling passes.
Keywords: FGM Sheets, Mechanical Properties, Microstructure, Powder Metallurgy, Hot
Rolling
