Grain size effect on the strengthening behavior of aluminum-based composites containing multi-walled carbon nanotubes

H. J. Choi, J. H. Shin, DongHyun Bae

Research output: Contribution to journalArticle

86 Citations (Scopus)

Abstract

Strengthening efficiency of multi-walled carbon nanotubes (MWCNTs) is investigated for aluminum-based composites with grain sizes ranging from ∼250 to ∼65 nm. The strength of composites is significantly enhanced proportional to an increase of the MWCNT volume. However, the increment differs depending on deformation mode of the matrix. The strengthening efficiency of MWCNTs in ultrafine-grained composites is comparable with that predicted by the discontinuous fiber model, whereas the efficiency becomes half of the theoretical prediction as grain size is reduced below ∼70 nm. For nano-grained aluminum, activities of forest dislocations diminish and dislocations emitted from grain boundaries are dynamically annihilated during the recovery process, providing a weak plastic strain field around MWCNTs. The observation may provide a basic understanding of the strengthening behavior of nano-grained metal matrix composites.

Original languageEnglish
Pages (from-to)1699-1705
Number of pages7
JournalComposites Science and Technology
Volume71
Issue number15
DOIs
Publication statusPublished - 2011 Oct 24

Fingerprint

Carbon Nanotubes
Strengthening (metal)
Aluminum
Carbon nanotubes
Composite materials
Dislocations (crystals)
Plastic deformation
Grain boundaries
Metals
Recovery
Fibers

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Ceramics and Composites

Cite this

@article{6f8c1f4b37b049a29585a754258ce462,
title = "Grain size effect on the strengthening behavior of aluminum-based composites containing multi-walled carbon nanotubes",
abstract = "Strengthening efficiency of multi-walled carbon nanotubes (MWCNTs) is investigated for aluminum-based composites with grain sizes ranging from ∼250 to ∼65 nm. The strength of composites is significantly enhanced proportional to an increase of the MWCNT volume. However, the increment differs depending on deformation mode of the matrix. The strengthening efficiency of MWCNTs in ultrafine-grained composites is comparable with that predicted by the discontinuous fiber model, whereas the efficiency becomes half of the theoretical prediction as grain size is reduced below ∼70 nm. For nano-grained aluminum, activities of forest dislocations diminish and dislocations emitted from grain boundaries are dynamically annihilated during the recovery process, providing a weak plastic strain field around MWCNTs. The observation may provide a basic understanding of the strengthening behavior of nano-grained metal matrix composites.",
author = "Choi, {H. J.} and Shin, {J. H.} and DongHyun Bae",
year = "2011",
month = "10",
day = "24",
doi = "10.1016/j.compscitech.2011.07.013",
language = "English",
volume = "71",
pages = "1699--1705",
journal = "Composites Science and Technology",
issn = "0266-3538",
publisher = "Elsevier BV",
number = "15",

}

Grain size effect on the strengthening behavior of aluminum-based composites containing multi-walled carbon nanotubes. / Choi, H. J.; Shin, J. H.; Bae, DongHyun.

In: Composites Science and Technology, Vol. 71, No. 15, 24.10.2011, p. 1699-1705.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Grain size effect on the strengthening behavior of aluminum-based composites containing multi-walled carbon nanotubes

AU - Choi, H. J.

AU - Shin, J. H.

AU - Bae, DongHyun

PY - 2011/10/24

Y1 - 2011/10/24

N2 - Strengthening efficiency of multi-walled carbon nanotubes (MWCNTs) is investigated for aluminum-based composites with grain sizes ranging from ∼250 to ∼65 nm. The strength of composites is significantly enhanced proportional to an increase of the MWCNT volume. However, the increment differs depending on deformation mode of the matrix. The strengthening efficiency of MWCNTs in ultrafine-grained composites is comparable with that predicted by the discontinuous fiber model, whereas the efficiency becomes half of the theoretical prediction as grain size is reduced below ∼70 nm. For nano-grained aluminum, activities of forest dislocations diminish and dislocations emitted from grain boundaries are dynamically annihilated during the recovery process, providing a weak plastic strain field around MWCNTs. The observation may provide a basic understanding of the strengthening behavior of nano-grained metal matrix composites.

AB - Strengthening efficiency of multi-walled carbon nanotubes (MWCNTs) is investigated for aluminum-based composites with grain sizes ranging from ∼250 to ∼65 nm. The strength of composites is significantly enhanced proportional to an increase of the MWCNT volume. However, the increment differs depending on deformation mode of the matrix. The strengthening efficiency of MWCNTs in ultrafine-grained composites is comparable with that predicted by the discontinuous fiber model, whereas the efficiency becomes half of the theoretical prediction as grain size is reduced below ∼70 nm. For nano-grained aluminum, activities of forest dislocations diminish and dislocations emitted from grain boundaries are dynamically annihilated during the recovery process, providing a weak plastic strain field around MWCNTs. The observation may provide a basic understanding of the strengthening behavior of nano-grained metal matrix composites.

UR - http://www.scopus.com/inward/record.url?scp=80054006159&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=80054006159&partnerID=8YFLogxK

U2 - 10.1016/j.compscitech.2011.07.013

DO - 10.1016/j.compscitech.2011.07.013

M3 - Article

VL - 71

SP - 1699

EP - 1705

JO - Composites Science and Technology

JF - Composites Science and Technology

SN - 0266-3538

IS - 15

ER -