Synthesis and characterization of aluminum alloy 7075 reinforced with silicon carbide particulates

In this study 7075 matrix alloy is chosen and SiC particles having average particle size of 29 mu m was incorporated into the alloy at the liquid state before vertical pressure casting. Four different additions of SiCp were made and the weight fractions used are 10%, 15%, 20% and 30%. Composites were processed by vertical pressure/squeeze casting machine developed at Middle East Technical University (METU) under 80 MPa pressure. The mold is specially designed to produce specimens for tensile and three point bend tests. Both as-cast and heat treated aluminum composites were examined and the T6 heat treatment was applied. Three point bend tests were performed to reveal the fracture strength of the aluminum composites. The 10 wt% SiCp aluminum matrix composites showed the maximum flexural strength both for the as-east (450 MPa) and heat treated conditions (588 MPa). The maximum flexural strength increased by about 40 MPa (10%) for the as-east and 180 MPa (44%) for heat treated composites. Hardness tests were performed to determine the maximum value. For the as-cast specimens the hardness values increased from 133 to 188 Vickers (10 kg) with an increase in SiCp content from 0 to 30 wt% and for the heat treated specimens the hardness values increased from 171 to 221 Vickers (10 kg). The peak hardness values were obtained for the 24 h precipitation heat treatment.


Effects of SiC particulates on the fatigue behaviour of an Al-alloy matrix composite
Kaynak, Cevdet (2006-01-01)
In this study, the fatigue behaviour of aluminium matrix-silicon carbide (SiC) particulate reinforced composite specimens was investigated in comparison to the matrix aluminium alloy containing 12 wt% Si. Three different weight percentages of SiC particulates: 5, 10, and 15 in the size range of 40-60 gm were injected into the melt. Mg was also added to improve the wettability of Al-alloy matrix over SiC particulates resulting in better interfacial bonding. Test specimens were machined from squeeze casting b...
Processing and assessment of aluminum ceramic fiber reinforced aluminum metal matrix composite parts for automotive and defense applications
Türkyılmaz, Gökhan; Kalkanlı, Ali; Department of Metallurgical and Materials Engineering (2009)
The aim of this study was to produce partially reinforced aluminum metal matrix composite components by insertion casting technique and to determine the effects of silicon content, fiber vol% and infiltration temperature on the mechanical properties of inserts, which were the local reinforcement parts of the components. Silicon content of alloys was selected as 7 wt% and 10 wt%. The reinforcement material, i.e. Saffil fiber preforms, had three different fiber vol% of 20, 25 and 30 vol% respectively. The inf...
Processing and characterization of carbon fiber reinforced silicon carbide (c/c-sic) matrix composites
Tülbez, Simge; Dericioğlu, Arcan Fehmi; Esen, Ziya; Department of Metallurgical and Materials Engineering (2015)
The current study was undertaken to investigate the production and characterization of Carbon Fiber Reinforced Silicon Carbide (C/C-SiC) Matrix Composites. Liquid silicon infiltration (LSI) method was utilized to produce the C/C-SiC composites. Processing of these composites via LSI process composed of three main stages. CFRP production, pyrolysis and liquid silicon infiltration. Each production stage has an important effect on the efficiency of the LSI process, therefore present study investigates the effe...
Investigation of microstructure inhomogeneity in SiCp-reinforced aluminum matrix composites
Gacsi, Zoltan; Gür, Cemil Hakan; Makszimus, Andrea; Pieczonka, Tadeusz (2007-01-01)
The type, volume fraction, size, shape and arrangement of embedded particles influence the mechanical properties of the particle reinforced metal matrix composites. This presents the investigation of the SiC particle and porosity distributions in various aluminum matrix composites produced by cold- and hot-pressing. The inicrostructures were characterized by optical microscopy and stereological parameters. SiC and porosity volume fractions, and the anisotropy distribution function were measured to establish...
MAKSZIMUS, Andrea; GACSI, Zoltan; Gür, Cemil Hakan (2007-10-16)
The purpose of this study is to find a relationship between the parameters describing the microstructural homogeneity of SiC particle reinforced Al metal matrix composites. The Al-SiC powder mixtures having different particle size combinations were hot-pressed after careful mixing. The optical microscope images of the microstructures were processed by using an image analyzing program; the binary morphology was chosen for characterizing the SiC particle distribution.
Citation Formats
A. Kalkanlı, “Synthesis and characterization of aluminum alloy 7075 reinforced with silicon carbide particulates,” MATERIALS & DESIGN, pp. 775–780, 2008, Accessed: 00, 2020. [Online]. Available: