Creep Properties of Squeeze-Infiltrated Carbon Nanotube and Aluminum Borate Whisker Reinforced AS52 Mg Metal Matrix Composites
The effects of carbon nanotubes (CNTs) and aluminum borate whisker (ABw) on the creep and tensile properties of an AS52 alloy matrix composites were investigated. A hybrid 5 vol% CNT + 20 vol% ABw/AS52 Mg MMC and a single 25 vol% ABw/AS52 Mg MMC were fabricated by preform fabrication and squeeze infiltration. Creep tests were carried out at temperatures of 150–250 °C under stresses of 50 and 70 MPa. The tensile property was evaluated at room temperature and 150 °C. The minimum creep rate decreased in the order AS52 > single MMC > hybrid MMC. The creep activation energy of the hybrid MMC was 182.9 kJ/mol which was 28% and 83% higher than those of the single MMC and the AS52, respectively. The room-temperature and high-temperature tensile strengths of the hybrid MMC showed the highest values. Creep properties of the hybrid MMC improved on addition of CNTs, which prevented creep void initiation and crack propagation along the ABw interface.
KeywordsComposites Carbon nanotubes Aluminum borate whisker Squeeze infiltration Creep
This research was mainly supported by Global Frontier Program through the Global Frontier Hybrid Interface Materials (GFHIM) of the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (2013M3A6B1078874) and this study was financially supported by the (2017 Post-Doc. Development Program) of Pusan National University.
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