The impact strength of Al6061/SiC metal matrix composites reinforced with nanoparticles of weight percentage (3%, 6%, 9% & 12%) was studied. The composites were fabricated using liquid metallurgy technique. The results revealed that the Al6061/SiC metal matrix composites exhibited better hardness and impact strength than the Al 6061 alloy. Such improvement in the mechanical properties was observed with increasing the weight percentage of SiC nanoparticles and this increase both the hardness and impact strengths of the composites. The impact strength of 12 wt% nano SiC p aluminum composites showed the maximum strength. The effect of the nanoparticles was acted as barriers to dislocation motion. It is seen that the impact energy of the composites increase gradually with filler content increasing from 3 to 12 wt%. SEM were carried out to identify the uniform distribution of nanoparticles in composites.

Metal storage tanks for liquid gas are unstable at low temperature (below zero degreecentigrade), because the metal tends to be brittle and susceptible to crack. In this researchstudying some physical properties such as shrinkage, adhesion force and coating layer thicknessof aluminum powder with ethyl silicate as a binder were performed. The results shown, that thecoating with such layer has excellent resistance to low temperature and impermeable to liquidgas for example, propane, methane and nitrogen a suitable coating layer thickness is (5mm). Thedata and results were optimized by using Taguchi / ANOVA Technique

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In this investigation, Zn-Al alloy metal-matrix nano composites that reinforced via various weight percentages (2%, 4%, 6%, and 8%) of nanosilica (SiO2) particles were fabricated applying the technique of stir casting. Behaviors of the corrosion of the unreinforced alloy and reinforced composites were measured utilizing a potentiostat test in a (3.5 wt.% NaCl) salt solution. The optical microscopy was employed to investigate the surface microstructure of the composite. Microstructure analysis manifested that the uniform distributions of the reinforcing particles in the composites are alike, consisting of a dendritic structure of the zinc alloy matrix with an excellent reinforcing particles steady dispersion. The improved results of the corrosion resistance for the metal matrix composites showed an excellent resistance to corrosion than the matrix in the (3.5 wt.% NaCl) solution. Raising the weight percentage of the reinforcement particulates of nansilica (SiO2) reduced the composites rate of corrosion.