Effect of nano Si3N4، Al2O3 و AlMg and cold rolling process on the microstructural and mechanical properties of AL-6061alloy
Subject Areas : journal of New Materials
Masoud Moshrefifar
1
(Department of Mining and Metallurgical Engineering, Yazd University, Yaz d, Iran)
Mehran Zare
2
(Department Metallurgical Engineering, Isfahan University of Technology, Isfahan, Iran)
Keywords: mechanical properties, Nanoparticles, stir casting, Si3N4,
Abstract :
Today, the use of nanoparticles in aluminum composite materials has attracted researchers due to their superior effects on mechanical and physical properties. Due to the poor wettability of the nanoparticles by the metal during the casting and the high ratio of the surface to the volume of the nanoparticles, it is difficult to achieve uniform distribution of the particles in the interior. In the manufacturing process, nanoparticles tend to form cluster particle masses. The mass of nanoparticles has undesirable effects on mechanical properties, including strength and resilience of the composite. In this study, stir casting process for composite manufacturing with different amount of mixed powder containing of nano Si3N4, AlMg and Al2O3 was used. For better distribution of particle reinforcement, cold rolling was used. In order to characterize the composite, microstructural, mechanical and phases studies properties were used. FESEM tests on mixture of aluminum and nanoparticles showed that after ball milling, particles are in nanometric size. Mechanical and optical result show that optimum of reinforcement is 0.5 % w.t. It is notable that the higher yield stress of the composite samples does not reduce the elongation significantly, when compared to monolithic aluminum.
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