Load-bearing contribution of multi-walled carbon nanotubes on tensile response of aluminum

Hiroki Kurita, Mehdi Estili, Hansang Kwon, Takamichi Miyazaki, Weiwei Zhou, Jean Franҫois Silvain, Akira Kawasaki

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)

Abstract

We fabricated a uniformly dispersed and aligned multi-walled carbon nanotube reinforced aluminum matrix (Al-MWCNT) composite with minimal work hardening and without interfacial chemical compounds. In this paper, the direct load-bearing contribution of MWCNTs on the Al-MWCNT composite was investigated in detail for various volume fractions of MWCNTs. For up to 0.6 vol% of MWCNTs, the ultimate tensile strength (UTS) of the Al-MWCNT composite increased with the conservation of the remarkable failure elongation of Al. These UTS values are consistent with shear lag model. We also observed an uncommon multi-wall-type failure of MWCNTs during the hot extrusion process. However, owing to the agglomeration of MWCNTs in the Al matrix, the UTS deviated significantly from the shear lag model and the remarkable failure elongation of Al decreased. The possibility of strengthening, without degrading ductility, was demonstrated by exploiting directly the load-bearing ability of individually and uniformly dispersed aligned MWCNTs.

Original languageEnglish
Pages (from-to)133-139
Number of pages7
JournalComposites Part A: Applied Science and Manufacturing
Volume68
DOIs
Publication statusPublished - 2015 Jan

Keywords

  • A. Metal-matrix composites (MMCs)
  • B. Mechanical properties
  • E. Extrusion
  • E. Powder processing

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials

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