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

Abstract

International audienceWe 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

Carbon Nanotube‐Reinforced Aluminum Matrix Composites

“…Figure shows the microstructure of CNT/Al composite at two different sintering temperatures of 800 K (Figure a–c) and 900 K (Figure d–f). The interface between the matrix and CNTs can be distinguished from HRTEM images in the sample sintered at 800 K; however, it became indistinct in the sample sintered at 900 K. Kurita et al and Jiang et al reported a similar characteristic of interface at different sintering temperatures.…”

Probabilistic model for flexural strength of carbon nanotube reinforced cement-based materials

“…The Kelly-Tyson model [26] which is the extension of the wellknown rule of mixtures has been extensively used to predict the tensile strength of brittle and ductile materials containing CNTs such as polymers, metals and ceramics [22,[34][35][36][37]. Besides, the Kelly-Tyson model was used to predict the flexural strength of concrete reinforced with short discrete fibers [38,39].…”

Effect of Heat Treatment on Al2024 Reinforcement With Multiwalled Carbon Nanotube

“…The porosity of the nanocomposite should be less for industrial applications. The percentage of porosity in the sintered composite is ranging from 3.27-6.159% for the varied weight percentage of MWCNT [19]. The decrease of porosity was observed to an extent of 16.65% to 8.71% in sintered to sintered-heat treated composite may be due to the dislocation movement of atoms and extension of grain boundaries by the addition of carbon nanotubes at high temperature during heat treatment [20].…”