Abstract
The superplastic deformation behavior of a carbon nanotube reinforced high-strength aluminium alloy matrix composite (CNT/7055Al) was investigated at temperatures ranging from 300 to 425 °C and strain rates ranging from 10−2 to 5 s−1. A maximum elongation of 125% was observed for the as-extruded CNT/7055Al at 400 °C and a high strain rate of 5 s−1. After a T6 treatment (solution and artificial aging treatment), the CNT/7055Al achieved a higher elongation of 153% at 400 °C and 5 s−1 due to the fewer second-phase particles. The strain rate sensitivity and activation energy were determined to be 0.2 and 171 kJ/mol, respectively. Combined with microstructural observation, it was demonstrated that the main deformation mechanism for the CNT/7055Al was lattice diffusion controlled dislocation climb. Further, it was found that CNTs played a negative role in the superplastic deformation, which could be attributed to the large aspect ratio of CNTs and strong CNT-Al interface bonding.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
