Consolidation of Carbon Nanotube Reinforced Aluminum Matrix Composites by High-Pressure Torsion |
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| Authors: | Hamed Asgharzadeh Soo-Hyun Joo Hyoung Seop Kim |
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| Affiliation: | 1. Department of Materials Engineering, Faculty of Mechanical Engineering, University of Tabriz, 51666-16471, Tabriz, Iran
2. Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, South Korea
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| Abstract: | 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 ~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. |
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