Abstract
Aluminum Metal Matrix Composites (ALMMCs) was prepared by using stir casting technique for AA 7075 aluminum alloy as a matrix reinforced with SiC particles at various percentages (3, 6, 9 and 12 wt. % ) and 75µm in grain size. The prepared composite material can be used for many applications such as aerospace, automobiles and many industrial sectors. Abrasive wear test was carried out by two stages: the first stage was done by changing the emery papers at various grit sizes 180, 320, 500, and 1000µm with constant applied load 15N. While the second stage was carried out by changing the applied loads 5, 10, 15, 20 and 25N with constant emery paper at 320 µm grit size. Microstructure examination, hardness test and roughness test were performed before and after abrasive wear test. The results of this investigation showed the increasing in weight percentage of the reinforcement material leads to increase the hardness, roughness and improving the abrasive wear resistance.
Highlights
An important alloy in industrial applications is AA7075 because of its properties such as low density, high thermal conductivity, high strength and high wear resistance, Kaufman, 2002 and ASM
A number of ceramics materials such as SiC, SiO2, Al2O3, TiO2, B4C, and carbon are used as reinforcements of AA 7075 to produce composite materials with desirable properties, Gangadhar, et al, 2014
Each of the microstructure shows the homogeneous dispersion and distribution of SiC into the molten of aluminum matrix, this is attributed to many parameters to synthesize the composites such as: 1- Rotating speed (700 rpm) for stir casting. 2- Viscosity of the molten slurry. 3- The pouring temperature. 4- Shape and size of SiC particles. 5- Cooling
Summary
An important alloy in industrial applications is AA7075 because of its properties such as low density, high thermal conductivity, high strength and high wear resistance, Kaufman, 2002 and ASM. Qiyao, et al, 2017, investigated the effect of SiC on mechanical and physical properties of two different aluminum alloys (AA356 and AA6061) produce by vacuum die casting with assisting high pressure. The results of this investigation reveal that the pores of the producing casts decrease with increasing the weight fraction of SiC. The results of this work reported that the increasing of Al2O3 will improve the wear resistance of AA6061 alloy The objective of this investigation is study the effect of increasing the weight fractions of SiC on the abrasive wear behavior of AA7075 alloy producing by stir casting.
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