Consolidation of Carbon Nanotube Reinforced Aluminum Matrix Composites by High-Pressure Torsion

被引：38
作者：
Asgharzadeh, Hamed [1 ]
Joo, Soo-Hyun [2 ]
Kim, Hyoung Seop [2 ]
机构：
[1] Univ Tabriz, Fac Mech Engn, Dept Mat Engn, Tabriz 5166616471, Iran
[2] Pohang Univ Sci & Technol POSTECH, Dept Mat Sci & Engn, Pohang 790784, South Korea
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2014年 / 45A卷 / 09期
关键词：
SEVERE PLASTIC-DEFORMATION; MECHANICAL-PROPERTIES; WALLED CARBON; NANOTUBE/ALUMINUM COMPOSITES; STRENGTHENING MECHANISMS; POWDER-METALLURGY; BEHAVIOR; ALLOY; EVOLUTION; MICROSTRUCTURE;
D O I：
10.1007/s11661-014-2354-6
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Al-3 vol pct carbon nanotube (CNT) composites are fabricated by consolidation through high-pressure torsion (HPT) at room temperature. The densification behavior, microstructural evolution, and mechanical properties of Al/CNT composites are studied. The results show that density and microstructural homogeneity increase with increasing number of revolutions under a high pressure of 6 GPa. Substantial grain refinement is achieved after 10 turns of HPT with an average grain thickness of similar to 38 nm perpendicular to the compression axis of HPT. The Al/CNT composite shows a considerable increase in hardness and strength compared to the Al matrix. The strengthening mechanisms of the Al/CNT composite are found to be (i) grain refinement of Al matrix and (ii) Orowan looping. Raman spectroscopy and high-resolution transmission electron microscopy reveal that the structure of most of CNTs is changed during processing through mechanical milling and HPT.
引用
收藏
页码：4129 / 4137
页数：9
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