Young’s Modulus Enhancement and Measurement in CNT/Al Nanocomposites

Young’s modulus is a critical parameter for designing lightweight structure, but Al and its alloys only demonstrate a limited value of 70–72 GPa. The introduction of carbon nanotubes (CNTs) is an effective way to make Al and its alloys stiffer. However, little research attention has been paid to You...

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Bibliographic Details
Published in:Acta metallurgica sinica : English letters 2018-11, Vol.31 (11), p.1121-1129
Main Authors: Yu, Zi-Yun, Tan, Zhan-Qiu, Fan, Gen-Lian, Lin, Ren-Bang, Xiong, Ding-Bang, Guo, Qiang, Su, Yi-Shi, Li, Zhi-Qiang, Zhang, Di
Format: Article
Language:English
Subjects:
Aluminum
Carbon
Carbon nanotubes
Characterization and Evaluation of Materials
Chemistry and Materials Science
Comparative studies
Corrosion and Coatings
Materials Science
Metallic Materials
Modulus of elasticity
Morphology
Nanocomposites
Nanoindentation
Nanotechnology
Organometallic Chemistry
Polyvinyl alcohol
Powder metallurgy
Resonance testing
Spectroscopy/Spectrometry
Statistical analysis
Stiffening
Tensile deformation
Tensile tests
Tribology
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Summary:Young’s modulus is a critical parameter for designing lightweight structure, but Al and its alloys only demonstrate a limited value of 70–72 GPa. The introduction of carbon nanotubes (CNTs) is an effective way to make Al and its alloys stiffer. However, little research attention has been paid to Young’s modulus of CNT/Al nanocomposites attributed to the uncertain measurement and unconvincing stiffening effect of CNTs. In this work, improved Young’s modulus of 82.4 ± 0.4 GPa has been achieved in 1.5 wt% CNT/Al nanocomposite fabricated by flake powder metallurgy, which was determined by resonance test and 13.5% higher than 72.6 ± 0.64 GPa of Al matrix. A comparative study and statistical analysis further revealed that Young’s modulus determined by tensile test was relatively imprecise (83.1 ± 4.0 GPa) due to the low-stress microplasticity or interface decohesion during tensile deformation of CNT/Al nanocomposite, while the value (98–100 GPa) was highly overestimated by nanoindentation due to the “pile-up” effect. This work shows an in-depth discussion on studying Young’s modulus of CNT/Al nanocomposites.
ISSN:1006-7191
2194-1289
DOI:10.1007/s40195-018-0730-8