In situ bend testing of niobium-reinforced alumina nanocomposites with and without single-walled carbon nanotubes

被引：8

作者：

Thomson, Katherine E. ^{[1
]}

Jiang, Dongtao ^{[1
]}

Lemberg, Joseph A. ^{[2
,3
]}

Koester, Kurt J. ^{[2
,3
]}

Ritchie, Robert O. ^{[2
,3
]}

Mukherjee, Amiya K. ^{[1
]}

机构：

[1] Univ Calif Davis, Dept Chem Engn & Mat Sci, Davis, CA 95616 USA

[2] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA

[3] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 493卷 / 1-2期

关键词：

spark plasma sintering (SPS); Al2O3; Nb; nanocomposites; carbon nanotubes; fracture toughness;

D O I：

10.1016/j.msea.2007.05.123

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Alumina-based nanocomposites were fabricated and consolidated via spark plasma sintering. The effect of single-walled carbon nanotube (SWCNT) and niobium additions to nanocrystalline alumina was examined by in situ bend testing. The addition of 10 vol.% niobium to nanocrystalline alumina provided substantial improvement of fracture toughness (6.1 MPa m(1/2))-almost three times that of nanocrystalline alumina. Observation of cracks emanating from Vickers indents, as well as bend specimen fracture surfaces, reveal the operation of ductile phase toughening in the Nb-Al2O3 nanocomposites. Further addition of 5 vol.% SWCNTs to the 10 vol.%Nb-Al2O3 revealed a more porous structure and less impressive fracture toughness-having an indentation and bend fracture toughness of 2.9 MPa m(1/2) and 3.3 MPa m(1/2), respectively. Published by Elsevier B.V.

引用

页码：256 / 260

页数：5

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