Young’s Modulus Enhancement and Measurement in CNT/Al Nanocomposites
来源期刊：Acta Metallurgica Sinica2018年第11期
论文作者：Zi-Yun Yu Zhan-Qiu Tan Gen-Lian Fan Ren-Bang Lin Ding-Bang Xiong Qiang Guo Yi-Shi Su Zhi-Qiang Li Di Zhang
文章页码：1121 - 1129
摘 要：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 of82.4 ± 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.
Zi-Yun Yu1，Zhan-Qiu Tan1，Gen-Lian Fan1，Ren-Bang Lin2，Ding-Bang Xiong1，Qiang Guo1，Yi-Shi Su1，Zhi-Qiang Li1，Di Zhang1
1. State Key Laboratory of Metal Matrix Composites, School of Material Science and Engineering Shanghai Jiao Tong University2. Shanghai Key Laboratory of Spacecraft Mechanism
摘 要：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 of82.4 ± 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.
关键词：
