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Mechanical Characteristics of Steel

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Updated: Aug 1, 2025

Processing of Bulk Nanocrystalline Metals at the US Army Research Laboratory

Processing of Bulk Nanocrystalline Metals at the US Army Research Laboratory

Published on: March 7, 2018

Microstructural Characterization of Al/CNTs Nanocomposites after Cold Rolling.

Íris Carneiro^1,2,3, José V Fernandes⁴, Sónia Simões^1,2

¹DEMM-Department of Metallurgical and Materials Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.

Nanomaterials (Basel, Switzerland)

|April 28, 2023

Summary

This study investigated aluminium-carbon nanotube (Al/CNTs) nanocomposite deformation during cold rolling. Powder metallurgy followed by cold rolling reliably enhances microstructure and mechanical properties, with CNTs influencing grain behavior and texture evolution.

Keywords:

carbon nanotubes cold rolling deformation behaviour metal matrix nanocomposites powder metallurgy

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Last Updated: Aug 1, 2025

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Published on: March 7, 2018

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Area of Science:

Materials Science
Mechanical Engineering
Nanotechnology

Background:

Metal matrix nanocomposites, particularly Al/CNTs, offer potential for advanced components in the mobility industry.
Powder metallurgy is a key production process for these nanocomposites, necessitating research into their deformation behavior.
Understanding deformation is crucial for optimizing microstructure and mechanical properties by reducing porosity.

Purpose of the Study:

To investigate the deformation behavior of Al/CNTs nanocomposites during cold rolling.
To evaluate the reliability of the powder metallurgy route followed by cold rolling for Al/CNTs nanocomposites.
To analyze the influence of CNTs on microstructure, crystallographic orientation, and mechanical properties.

Main Methods:

Production of Al/CNTs nanocomposites via powder metallurgy.
Microstructural characterization using optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and electron backscattered diffraction (EBSD).
Mechanical characterization including hardness and tensile strength testing during cold rolling.

Main Results:

The powder metallurgy route combined with cold rolling is effective for Al/CNTs nanocomposites.
Microstructural analysis revealed distinct crystallographic orientations in nanocomposites compared to the Al matrix.
CNTs influence grain rotation during sintering and deformation, leading to different texture evolution and an initial decrease in hardness and strength due to the Bauschinger effect.

Conclusions:

Cold rolling of powder metallurgy-produced Al/CNTs nanocomposites is a viable method for property enhancement.
The presence of CNTs significantly alters the crystallographic texture and deformation mechanisms.
Differences in texture evolution between Al/CNTs nanocomposites and the Al matrix account for variations in mechanical properties during cold rolling.