Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 156, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2022.106887
Keywords
Metal-matrix composites (MMCs); Graphene; Damping; Microstructural analysis
Funding
- Ministry of Science and Technology of China [2017YFB0703100]
- Natural Science Foun-dation of China [51771111]
- Science &Technology Committee of Shanghai Municipality [20S31900600]
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Micro-pillars made from RGO-reinforced Al-Mg-Si alloy after peak-ageing treatment show improved damping capacity and resistance to plastic deformation. The increase in damping coefficient is attributed to the combined effect of dislocation impedance, dislocation looping and cutting at precipitates, and formation of nano-twins.
Cyclic uniaxial compression tests were carried out on micro-pillars fabricated from reduced graphene oxide (RGO)-reinforced Al-Mg-Si alloy that went through peak-ageing treatment. The composite pillars were found to have a significantly better damping capacity and improved resistance to plastic deformation as compared to the unreinforced matrix. These observations were further corroborated by the much higher damping coefficient of the composite pillars (eta = 0.3081 +/- 0.0803), almost doubled that for the alloy matrix alone (0.1560 +/- 0.0457). Site-specific TEM analysis revealed that the enhanced damping property of the composite came from a combined effect of dislocation impedance at the RGO/Al interface, the dislocation looping and cutting at the precipitates, and the formation of nano-twins in the alloy matrix upon deformation.
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