In situ composites have been studied mainly to eliminate wettability, porosity and non-uniform distribution of particulate problems in composite materials. Al-Mg 2 Si alloy are preferred choice of such group of alloys owing to the combination of light weight and improved mechanical properties. The morphology of Mg 2 Si is one of the key parameters for the wear properties. In this work, squeezed casting method was used to produce samples where porosity was aimed to be reduced and morphology of Mg 2 Si was altered. In addition, the wear properties of in situ A380-Mg 2 Si were investigated. It was found that as squeeze pressure was increased, porosity and size of Mg 2 Si was decreased and wear rate was increased.

In this paper, a promising manufacturing approach to cast metal matrix composites is proposed. In order to produce metal matrix composites by investment casting, SiC preforms were fabricated in 3D structure. Afterwards, A6063 aluminium alloy matrix material was infiltrated into preforms which were placed in the solid investment casting moulds with vacuum assistance. Preforms were characterized using Archimedes' test, scanning electron microscope anâ X ray diffraction analysis. Also, fabricated cast speci mens, were characterized using hardness tests, image analysis and scanning electron microscope observa tions. The results show that, in the vacuum assisted solidmould investment casting method; infiltration, of the preforms by molten metal was successfully achieved. Moreover, hardness of the composite higher than the matrix up to ratio of 100% by SiC reinforcement and T6 heat treatment.

Naval brasses consisting of the α–β duplex phases are a special kind of Cu-Zn alloys. They are known to have excellent corrosion resistance to sea water and marine conditions. The aim of this study is the investigation of properties and behaviours of naval brass parts formed by different casting processes. A medium leaded naval brass alloy with 60 % Cu, 39 % Zn and 1 % Pb approximate composition was used. Several samples were subjected to mechanical testing by means of tensile and hardness tests. Light optical microscopy with image analyser and scanning electron microscopy were used for microstructure observations. The corrosion test was applied in sea water conditions. Results reveal that besides hot forging also casting is a very suitable technique for naval brass shaping. Casting does not have a negative effect on the most important property corrosion resistance. Furthermore, the obtained mechanical properties are satisfactory.