Investigation of microstructure inhomogeneity in SiCp-reinforced aluminum matrix composites

Gacsi, Zoltan
Gür, Cemil Hakan
Makszimus, Andrea
Pieczonka, Tadeusz
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 the influence of the consolidation method. The results showed that SiC particles are arranged in a different way during the cold- and hot pressing. The amount of porosity in the hot pressed specimens is always lower than that in the cold pressed ones; however, cold pressed and sintered samples have few large pores whereas more fine pores develop in the hot pressed ones. In the cold pressed specimens, heating rate for sintering influences the final density, the amount of porosity increases parallel to the increase in the relative particle size; and coating of SiC particles with Cu lowers the porosity while Ni-coating does not result in such an effect.
Power Metallurgy World Congress and Exhibition 2006


Investigation of the microstructure and hardness of SiCP reinforced aluminum matrix composites
Makszimus, Andrea; Gácsi, Zoltán; Gür, Cemil Hakan (2008-01-01)
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.
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A conventional hot pressing method was used to produce Al-Cu-SiC particulate metal matrix composites. The matrix alloy was prepared from elemental powders of Al and 5 wt.% Cu. The composite comprises 13.3 or 27.2 vol.% SiCp with an average size of 10 mum. The powder mixtures were hot pressed uniaxially under nitrogen atmosphere. It is shown that Cu aids in the Formation of a liquid phase. Practically pore free structures are obtained after pressing at 600 degreesC, Elastic modulus, tensile strength and yiel...
Investigation of structural, electronic, magnetic and lattice dynamical properties for XCoBi (X: Ti, Zr, Hf) Half-Heusler compounds
Surucu, Gokhan; IŞIK, MEHMET; CANDAN, ABDULLAH; Wang, Xiaotian; Güllü, Hasan Hüseyin (Elsevier BV, 2020-06-15)
Structural, electronic, magnetic, mechanical and lattice dynamical properties of XCoBi (X: Ti, Zr, Hf) Half-Heusler compounds have been investigated according to density functional theory and generalized gradient approximation. Among alpha, beta and gamma structural phases, gamma-phase structure has been found as the most stability characteristics depending on the calculated formation enthalpies, energy-volume dependencies and Cauchy pressures. Energy-volume plots of possible magnetic orders of gamma-phase ...
Design and development of high temperature nickel-based superalloys
Eriş, Rasim; Akdeniz, Mahmut Vedat; Mekhrabov, Amdulla O.; Department of Metallurgical and Materials Engineering (2017)
Remarkable high temperature mechanical properties of nickel-based superalloys are related with the arrangement of ternary alloying elements in L12-type ordered γ'-Ni3Al intermetallics. Therefore, in this thesis, high temperature site occupancy preference and energetic-structural characteristics of atomic short range ordering of ternary alloying X elements (X = Co, Cr, Hf, Mo, Nb, Pt, Re, Ru, Ta and W, respectively) in Ni75Al21.875X3.125 alloy systems have been studied by combining the statistico-thermodynam...
Assessment and modelling of particle clustering in cast aluminum matrix composites
Çetin, Arda; Kalkanlı, Ali; Department of Metallurgical and Materials Engineering (2008)
The damage and deformation behaviour of particle reinforced aluminum matrix composites can be highly sensitive to local variations in spatial distribution of reinforcement particles, which markedly depend on melt processing and solidification stages during production. The present study is aimed at understanding the mechanisms responsible for clustering of SiC particles in an Al-Si-Mg (A356) alloy composite during solidification process and establishing a model to predict the risk of cluster formation as a f...
Citation Formats
Z. Gacsi, C. H. Gür, A. Makszimus, and T. Pieczonka, “Investigation of microstructure inhomogeneity in SiCp-reinforced aluminum matrix composites,” presented at the Power Metallurgy World Congress and Exhibition 2006, Busan, SOUTH KOREA, 2007, Accessed: 00, 2020. [Online]. Available: