Effect of particulate content on the thermal cycling behaviour of the magnesium alloy based hybrid composites


The thermal cycling behaviour of a creep-resistant AE42 alloy, AE42 alloy reinforced with 20 vol% saffil short fibre as well as various volume fractions of saffil short fibre and SiC particulate has been examined in the temperature range of 30–350 8C. It is found that the plastic deformation due to internal thermal mismatch stresses above 250 8C increases and coefficient of thermal expansion decreases with increasing volume fraction of SiC particulates. The only microstructural change observed after thermal cycling is an increased precipitation in the matrix.
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