High temperature thermal stability of pure copper and copper-carbon nanotube composites consolidated by High Pressure Torsion

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

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

The thermal stability of ultrafine-grained (UFG) microstructures in pure copper samples and copper-carbon nanotube (CNT) composites processed by High Pressure Torsion (HPT) was compared. The UFG microstructure in the sample consolidated from pure Cu powder exhibited better stability than that developed in a casted Cu specimen. The addition of CNTs to the Cu powder further increased the stability of the UFG microstructure in the consolidated Cu matrix by hindering recrystallization, however it also yielded a growing porosity and cracking during annealing. It was shown that the former effect was stronger than the latter one, therefore the addition of CNTs to Cu has an overall benefit to the hardness in the temperature range between 300 and 1000 K. A good agreement between the released heat measured during annealing and the calculated stored energy was found for all samples.

Original languageEnglish
Pages (from-to)71-79
Number of pages9
JournalComposites Part A: Applied Science and Manufacturing
Volume51
DOIs
Publication statusPublished - 2013

Fingerprint

Carbon Nanotubes
Torsional stress
Copper
Carbon nanotubes
Thermodynamic stability
Powders
Microstructure
Composite materials
Annealing
Temperature
Porosity
Hardness
Ultrafine

Keywords

  • A. Metal-matrix composites (MMCs)
  • A. Nano-structures
  • B. High-temperature properties
  • B. Microstructures

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials

Cite this

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title = "High temperature thermal stability of pure copper and copper-carbon nanotube composites consolidated by High Pressure Torsion",
abstract = "The thermal stability of ultrafine-grained (UFG) microstructures in pure copper samples and copper-carbon nanotube (CNT) composites processed by High Pressure Torsion (HPT) was compared. The UFG microstructure in the sample consolidated from pure Cu powder exhibited better stability than that developed in a casted Cu specimen. The addition of CNTs to the Cu powder further increased the stability of the UFG microstructure in the consolidated Cu matrix by hindering recrystallization, however it also yielded a growing porosity and cracking during annealing. It was shown that the former effect was stronger than the latter one, therefore the addition of CNTs to Cu has an overall benefit to the hardness in the temperature range between 300 and 1000 K. A good agreement between the released heat measured during annealing and the calculated stored energy was found for all samples.",
keywords = "A. Metal-matrix composites (MMCs), A. Nano-structures, B. High-temperature properties, B. Microstructures",
author = "P. Jenei and J. Gubicza and Yoon, {E. Y.} and Kim, {H. S.} and J. L{\'a}b{\'a}r",
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T1 - High temperature thermal stability of pure copper and copper-carbon nanotube composites consolidated by High Pressure Torsion

AU - Jenei, P.

AU - Gubicza, J.

AU - Yoon, E. Y.

AU - Kim, H. S.

AU - Lábár, J.

PY - 2013

Y1 - 2013

N2 - The thermal stability of ultrafine-grained (UFG) microstructures in pure copper samples and copper-carbon nanotube (CNT) composites processed by High Pressure Torsion (HPT) was compared. The UFG microstructure in the sample consolidated from pure Cu powder exhibited better stability than that developed in a casted Cu specimen. The addition of CNTs to the Cu powder further increased the stability of the UFG microstructure in the consolidated Cu matrix by hindering recrystallization, however it also yielded a growing porosity and cracking during annealing. It was shown that the former effect was stronger than the latter one, therefore the addition of CNTs to Cu has an overall benefit to the hardness in the temperature range between 300 and 1000 K. A good agreement between the released heat measured during annealing and the calculated stored energy was found for all samples.

AB - The thermal stability of ultrafine-grained (UFG) microstructures in pure copper samples and copper-carbon nanotube (CNT) composites processed by High Pressure Torsion (HPT) was compared. The UFG microstructure in the sample consolidated from pure Cu powder exhibited better stability than that developed in a casted Cu specimen. The addition of CNTs to the Cu powder further increased the stability of the UFG microstructure in the consolidated Cu matrix by hindering recrystallization, however it also yielded a growing porosity and cracking during annealing. It was shown that the former effect was stronger than the latter one, therefore the addition of CNTs to Cu has an overall benefit to the hardness in the temperature range between 300 and 1000 K. A good agreement between the released heat measured during annealing and the calculated stored energy was found for all samples.

KW - A. Metal-matrix composites (MMCs)

KW - A. Nano-structures

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KW - B. Microstructures

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