Abstract
Carbon nanofiber (CNF) reinforced A7xxx nanocomposites were fabricated by a liquid process, and the effect of CNF dispersion on the mechanical properties of the CNF/A7xxx nanocomposites was investigated. To enhance the dispersion of CNFs in the A7xxx matrix, we reduced their aspect ratios by vibration milling, and used surfactants and ultrasonication. A Cu layer was coated on the surface of CNFs to enhance the wettability of Al on CNF, to reduce the difference in specific gravity between CNFs and the Al melt, and to suppress the formation of brittle Al 4C 3 phase. Also, a button-shaped feedstock was fabricated with a mixture of Cu coated CNFs and Al powers to overcome the difficulty in direct injection of CNFs into the Al melt. As a result, CNF/A7xxx nanocomposites were successfully fabricated by a liquid process. The variations in the mechanical properties of the CNF/A7xxx nanocomposites according to the concentration of CNFs were analyzed. The yield strength, ultimate tensile strength, and elastic modulus of the nanocomposites for CNF of 0.76wt% increased by 33%, 55%, and 17%, respectively, in comparison to those of the A7xxx matrix. The CNF dispersion increased the strength of the CNF/A7xxx nanocomposites by about 38%.
| Original language | English |
|---|---|
| Pages (from-to) | 337-342 |
| Number of pages | 6 |
| Journal | Materials Science and Engineering A |
| Volume | 556 |
| DOIs | |
| Publication status | Published - 2012 Oct 30 |
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Keywords
- Al nanocomposite
- Carbon nanofiber (CNF)
- Cu coating
- Melt stirring
- Wettability
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanical Engineering
- Mechanics of Materials
Cite this
Effects of CNF dispersion on mechanical properties of CNF reinforced A7xxx nanocomposites. / Lim, Jun Young; Oh, Se Il; Kim, Yu Chan; Jee, Kwang Koo; Sung, Yun Mo; Han, Jun Hyun.
In: Materials Science and Engineering A, Vol. 556, 30.10.2012, p. 337-342.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effects of CNF dispersion on mechanical properties of CNF reinforced A7xxx nanocomposites
AU - Lim, Jun Young
AU - Oh, Se Il
AU - Kim, Yu Chan
AU - Jee, Kwang Koo
AU - Sung, Yun Mo
AU - Han, Jun Hyun
PY - 2012/10/30
Y1 - 2012/10/30
N2 - Carbon nanofiber (CNF) reinforced A7xxx nanocomposites were fabricated by a liquid process, and the effect of CNF dispersion on the mechanical properties of the CNF/A7xxx nanocomposites was investigated. To enhance the dispersion of CNFs in the A7xxx matrix, we reduced their aspect ratios by vibration milling, and used surfactants and ultrasonication. A Cu layer was coated on the surface of CNFs to enhance the wettability of Al on CNF, to reduce the difference in specific gravity between CNFs and the Al melt, and to suppress the formation of brittle Al 4C 3 phase. Also, a button-shaped feedstock was fabricated with a mixture of Cu coated CNFs and Al powers to overcome the difficulty in direct injection of CNFs into the Al melt. As a result, CNF/A7xxx nanocomposites were successfully fabricated by a liquid process. The variations in the mechanical properties of the CNF/A7xxx nanocomposites according to the concentration of CNFs were analyzed. The yield strength, ultimate tensile strength, and elastic modulus of the nanocomposites for CNF of 0.76wt% increased by 33%, 55%, and 17%, respectively, in comparison to those of the A7xxx matrix. The CNF dispersion increased the strength of the CNF/A7xxx nanocomposites by about 38%.
AB - Carbon nanofiber (CNF) reinforced A7xxx nanocomposites were fabricated by a liquid process, and the effect of CNF dispersion on the mechanical properties of the CNF/A7xxx nanocomposites was investigated. To enhance the dispersion of CNFs in the A7xxx matrix, we reduced their aspect ratios by vibration milling, and used surfactants and ultrasonication. A Cu layer was coated on the surface of CNFs to enhance the wettability of Al on CNF, to reduce the difference in specific gravity between CNFs and the Al melt, and to suppress the formation of brittle Al 4C 3 phase. Also, a button-shaped feedstock was fabricated with a mixture of Cu coated CNFs and Al powers to overcome the difficulty in direct injection of CNFs into the Al melt. As a result, CNF/A7xxx nanocomposites were successfully fabricated by a liquid process. The variations in the mechanical properties of the CNF/A7xxx nanocomposites according to the concentration of CNFs were analyzed. The yield strength, ultimate tensile strength, and elastic modulus of the nanocomposites for CNF of 0.76wt% increased by 33%, 55%, and 17%, respectively, in comparison to those of the A7xxx matrix. The CNF dispersion increased the strength of the CNF/A7xxx nanocomposites by about 38%.
KW - Al nanocomposite
KW - Carbon nanofiber (CNF)
KW - Cu coating
KW - Melt stirring
KW - Wettability
UR - http://www.scopus.com/inward/record.url?scp=84865423651&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84865423651&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2012.06.096
DO - 10.1016/j.msea.2012.06.096
M3 - Article
AN - SCOPUS:84865423651
VL - 556
SP - 337
EP - 342
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
ER -