Record number :
2167340
Title of article :
Strengthening and toughening of aluminum by single-walled carbon nanotubes
Author/Authors :
Choi، نويسنده , , H.J. and Bae، نويسنده , , D.H.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2011
Pages :
6
From page :
2412
To page :
2417
Abstract :
Effects of single-walled carbon nanotubes (SWNTs) on strengthening and toughening behaviors of aluminum-based composites with grain sizes ranging from nano- to micrometer have been investigated. The strength of composites is enhanced as an increase in SWNT volume and a decrease in grain size. Nanocrystalline composite containing 3.5 vol.% SWNTs exhibits good ductility of ∼5% tensile elongation to failure as well as superior yield stress of ∼600 MPa. However, the strengthening efficiency of SWNTs becomes half of the theoretical prediction for nanocrystalline composites due to the recovery process around the interface. Nanocrystalline composite containing 2.0 vol.% SWNTs shows the fracture toughness of ∼57 MPa mm1/2, which is five times higher than that of starting aluminum. SWNTs may effectively block the propagation of necks and cracks, providing much improved ductility and toughness.
Keywords :
mechanical characterization , fracture , Powder metallurgy , aluminum , Composites , Carbon nanotubes
Journal title :
MATERIALS SCIENCE & ENGINEERING: A
Journal title :
MATERIALS SCIENCE & ENGINEERING: A
Serial Year :
2011
Link To Document :
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