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Effect of thermal stress on the microstructures of aluminium metal matrix composites

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Discontinuous reinforced aluminium metal matrix composites have been synthesized using nanocrystalline mullite and zirconia of diameters ranging between 20-30 nm prepared by a sol-gel route. Uniaxial hot pressing technique was used to prepare the composites in the temperature range varying between 450-610 degrees C, close to the matrix metal solidus. The thermal stress-induced evolution of microstructures of the Al metal matrix were characterised by applying X-ray diffraction line profile analysis in terms of the defect parameters such as particle (domain) sizes, root mean square strains, lattice parameter changes, dislocation densities etc. The microhardness (Vickers) values of the composites have been measured and correlated with the values of thermal stress along with other parameters depicting the matrix microstructures. (C) 1998 Elsevier Science S.A. References: 48

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