Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 797, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2020.140263
Keywords
Superplasticity; Carbon nanotubes; Aluminium matrix composites; High strain rate; Deformation mechanism
Categories
Funding
- Key Research Program of Frontier Sciences, CAS [QYZDJ-SSW-JSC015]
- National Key R&D Program of China [2017YFB0703104, 040103]
- National Natural Science Foundation of China [51931009, 51871215]
- Youth Innovation Promotion Association CAS [2020197]
Ask authors/readers for more resources
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 degrees 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 degrees 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 degrees 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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available