Investigation on Mechanical and Corrosion Characteristics of LM13-ZrB2 Composites
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Abstract
In this study, mechanical and corrosion behaviour of LM13-ZrB2 composites are evaluated through gradual rise in concentration of ZrB2 from 2.5%wt. to 10%wt. The samples for investigation are casted by means of stir cast route and prepared as per ASTM standards. Micrograph analysis revealed even spread of reinforcing agents in the matrix region with few clusters of ZrB2. Practical and theoretical density results showed linear uptrend for samples with increasing weight proportion of ZrB2. The percentage of void formation is relatively less for the synthesized composites than that of LM13 Al alloy sample and the void percentage falls within the acceptable zone (i.e., 5%). Impact test results exhibited inverse relationship between energy absorbed by the specimen and the number of ceramic particulates in base phase. In addition, corrosion rate of composites decreased with adding of ZrB2 and the higher corrosion resistance obtained for LM13-10ZrB2 composite with enhancement of 80% relative to LM13 Al alloy sample.
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