Microstructure and hardness of copper-carbon nanotube composites consolidated by High Pressure Torsion

P. Jenei, E. Y. Yoon, J. Gubicza, H. S. Kim, J. Lábár, T. Ungár

Research output: Contribution to journalArticle

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Abstract

Blends of Cu powders and 3. vol.% carbon nanotubes (CNTs) were consolidated by High Pressure Torsion (HPT) at room temperature (RT) and 373. K. The grain size, the lattice defect densities as well as the hardness of the composite samples were determined. It was found that the Cu-CNT composite processed at RT exhibited a half as large mean grain size and a three times higher dislocation density than those observed in the specimens either consolidated from pure Cu powder or processed from bulk Cu by HPT. The small grain size and the pinning effect of CNT fragments on dislocations led to significant twin boundary formation during HPT. The increase of the temperature of HPT-processing to 373. K resulted in a slight increase of the grain size, and a strong decrease of the dislocation density and the twin boundary frequency in the composite. The correlation between the microstructural parameters and the flow stress calculated from the hardness was discussed.

Original languageEnglish
Pages (from-to)4690-4695
Number of pages6
JournalMaterials Science and Engineering A
Volume528
Issue number13-14
DOIs
Publication statusPublished - May 25 2011

Fingerprint

Carbon Nanotubes
Torsional stress
torsion
Copper
Carbon nanotubes
hardness
grain size
Hardness
carbon nanotubes
copper
microstructure
Microstructure
composite materials
Composite materials
Powders
Crystal defects
Defect density
room temperature
Plastic flow
Temperature

Keywords

  • Composites
  • Dislocations
  • Hardness measurement
  • Nanostructured materials
  • Powder metallurgy
  • X-ray diffraction

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Microstructure and hardness of copper-carbon nanotube composites consolidated by High Pressure Torsion. / Jenei, P.; Yoon, E. Y.; Gubicza, J.; Kim, H. S.; Lábár, J.; Ungár, T.

In: Materials Science and Engineering A, Vol. 528, No. 13-14, 25.05.2011, p. 4690-4695.

Research output: Contribution to journalArticle

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