Paper Information

Journal:   MODARES MECHANICAL ENGINEERING   JANUARY 2017 , Volume 16 , Number 10 #F0070; Page(s) 335 To 342.
 
Paper: 

PREPARATION AND CHARACTERIZATION OF A356 COMPOSITE REINFORCED WITH SIC NANOAND MICROPARTICLES BY STIR CASTING METHOD

 
 
Author(s):  AMOURI KAMAL, AMOURI JAMAL, AHMADIFARD SAEED, KAZAZI MAHDI*, KAZEMI SHAHAB
 
* DEPARTMENT OF MATERIALS ENGINEERING, FACULTY OF ENGINEERING, MALAYER UNIVERSITY, MALAYER, IRAN
 
Abstract: 

In this study, A356 aluminum alloy matrix composites reinforced with different weight percentages of SiC nano- and microparticles respectively with 50 nm and 5 mm average particle sizes were fabricated by stir casting method. Due to the effect of T6 heat treatment on the strength and hardness of A356 alloy, the obtained composites were subjected to the T6 heat treatment. The mechanical properties such as hardness and compressive properties of the composites were investigated. Microstructures of the samples were also investigated by an optical microscope (OM), scanning electron microscope (SEM) and field emission scanning electron microscope (FESEM). Microstructural investigation indicated that T6 heat treatment led to the change of eutectic silicon morphology and formation of the Mg2Si precipitates during age hardening stage, leading to increased hardness and compressive strength. The results showed that an increase in wt.% of nanoparticles leading to increased hardness and compressive strength. The results of microstructural investigation showed the relatively uniform distribution of reinforcement particles. Also, the strength and hardness of the composites reinforced with nanoparticles were greater than those of the composite reinforced with microparticles, even with higher weight percent of reinforcement particles. Hardness and compressive strength at 35% strain for the composite reinforced with 1.5 wt.% nanoparticles were respectively obtained 62 HBN and 252MPa, which are improved compared to the base alloy.

 
Keyword(s): STIR CASTING, T6 HEAT TREATMENT, MICROSTRUCTURE, SIC PARTICLES, HARDNESS AND COMPRESSIVE STRENGTH
 
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