CNT-induced microstructural evolution in Al matrix composite made by additive manufacturing and studying the effect of CNT presence on mechanical and tribological properties
Year: 2025
Type: article
Abstract: This study investigates the microstructural behaviour and mechanical properties of carbon nanotube (CNT)-reinforced AA2024 aluminum matrix composites fabricated via Selective Laser Melting (SLM), with varying CNT contents of 1, 3, and 5 wt%. As the CNT content increased, the quality of single-track deposits improved, leading to more consistent and continuous weld beads, particularly at 5 wt% CNT. The results demonstrate that CNT reinforcement significantly influences microstructural evolution and enhances the mechanical performance of SLM-processed nanocomposites. Specifically, the 5 wt% CNT/AA2024 composite exhibited refined microstructures, uniform CNT dispersion, improved mechanical properties, and the formation of the Al₄C₃ phase during the SLM process. Wear analysis revealed that increasing sliding speed led to a reduction in wear rate and a transition in wear mechanism—from abrasive to delamination—due to the formation of a stable mechanically mixed layer (MML) that reduced contact between the composite surface and the counter body. Additionally, at higher normal loads, a combined oxidation and delamination wear mechanism became dominant in the CNT-reinforced composites.
Source: Results in Engineering
Authors: Mahmoud Abbasi, Behrouz Bagheri Vanani, Amin Abdollahzadeh, Mahdi Sadeqi Bajestani, Melika Mohammadkhah, Sandra Klinge
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,940
OpenAlex ID: W4413289770