Effect of thermal stresses on the thermal expansion and damping behavior of ZA-27/aluminite metal matrix composites |
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Authors: | Shanta Sastry M Krishna Jayagopal Uchil |
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Affiliation: | (1) Department of Physics, NMKRV College for Women, Jayanagar, Bangalore, India;(2) Department of Mechanical Engineering, RV College of Engineering, 560059 Bangalore, India;(3) Department of Material Science, Mangalore University, Mangalore, India |
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Abstract: | When the fabrication of a metal matrix composite (MMC) involves its cooling from a high temperature, plastic-elastic residual
deformation fields can be generated within and around the particle due to the differential thermal expansion between the particle
and matrix metal. The present investigation is concerned with the effect of thermal residual stresses on the thermal expansion
and damping behavior of aluminite particulate-reinforced ZA-27 alloy MMCs. Composites were prepared by the compocasting technique
with 1, 2, 3, and 4 wt.% of aluminite reinforcement. Thermal expansion and damping properties have been studied experimentally
as a function of temperature over a temperature range 30 to 300 °C both in the heating and cooling cycle. The thermal expansion
studies exhibited some residual strain, which increased with the increase in the weight percent of the reinforcement. The
damping capacity of both the composites and matrix alloy is found to increase with the increase in temperature during the
heating cycle, whereas in the cooling cycle, damping behavior exhibits a maximum, which becomes more pronounced with the increase
in the weight percentage of the reinforcement. The appearance of the maximum may be linked with dislocation generation and
motion as a result of plastic deformation of the matrix at the metal/reinforcement interface. This phenomenon is attributed
to the thermal stresses generated as a result of coefficient of thermal expansion (CTE) mismatch between the composite constituent
phases. The thermal stresses have been estimated in both the cases using simple models. |
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Keywords: | aluminite CTE damping capacity thermal stresses ZA-27 |
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