Polymer composite reinforced with fiber materials have always proven its superior significant enactment over numerous traditional materials, considering their incomparable strength to weight ratio and stiffness. Carbon nanotubes usage in glass-fiber reinforced polymer has high potential in changing the characteristics of composite laminates. Carbon nanotubes have engrossed composite fraternity in exploring the opportunity of utilizing them as a supplementary reinforcement in fiber reinforced polymer composites. This study examines the mechanical characters of glass-fiber reinforced polymer with and without multi-walled carbon nanotubes (MWCNT). Composite laminated layers are fabricated using epoxy resin without carbon nanotube and with 0.5 and 1.5 % MWCNT. The materials were tested to determine tensile, flexural and compression properties. It is observed that the carbon nanotubes can enhance the mechanical properties in the composite laminates. Composite laminate with 1.5 wt % MWCNT exhibited good mechanical properties compared to that with 0.5 wt % MWCNT and without MWCNT.

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A new series of magnesium alloys are being developed as due to good properties with any rare earth components. In order to investigate the effects of friction stir welding (FSW) on microstructures and thermo gravimetric analysis of ZE42 magnesium alloy, the hot-extruded alloy plates were butt welded by FSW at various welding speeds.The results showed that the alloy was jointed without defects. The alloy is characterized by mechanical properties, SEM, XRD, TGA and FTIR. With increasing welding speed, the maximum intensity in the NZ first decreased and then increased. In all cases the tensile properties of the alloy after FSW decreased due to the softened region at the heataffected zone (HAZ), FT-IR results helps in distinguishing strong absorption appear in the region of nugget zone it is easily recognized by bands.

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