EVERGREEN

Joint Journal of Novel Carbon Resource Sciences and Green Asia Strategy

ISSN:2189-0420 (Print until Mar 2020)
ISSN:2432-5953 (Online)

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Development and Characterization of Semisolid-Formed Al-5%Cu-4%Mg/SiC Composites for Lightweight Structural Applications

Hermawan Agus Suhartono1,*, Yusuf Afandi1, Kirman Kirman1, Gilang Cempaka Kusuma1, Gita Puspita1, Rudi Yanto1, Ahmad Khotib Ismail1, I Nyoman Sadguna1, Franky M Silitonga1, Sambodo Arif Wibowo1
1Research Center for Structural Strength Technology, National Research and Innovation Agency, Indonesia
*Author to whom correspondence should be addressed:
E-mail: hagu001@brin.go.id (HAS)
Evergreen, Vol. 12, Iss. 04, pp. 2013–2023, 2025
DOI: 10.5109/7402633
Creative Commons Attribution 4.0 International Creative Commons Attribution 4.0 International
Received: May 26, 2025 | Revised: October 06, 2025 | Accepted: December 15, 2025 | Published: December 2025
Abstract
Aluminum-based metal matrix composites (MMCs) are attractive for lightweight structures and components due to their low density and high specific strength. This study reports the synthesis of Al-5%Cu-4%Mg/SiC composites via an integrated route combining in-house alloy preparation, high-speed stir casting (5000 rpm), and semisolid compression forming at 640 °C under 150 tons. In contrast to prior works that relied on commercial alloys, pure aluminum ingot, pure copper wire, and Al-13%Mg master alloy were used to enable precise control over matrix–reinforcement interactions. Silicon carbide particles (50–200 µm) were incorporated at 5% and 20% volume fractions with argon-assisted dispersion, achieving uniform distribution and strong interfacial bonding. Semisolid forming refined the microstructure, producing fine, globular grains that enhanced mechanical performance. Standardized testing revealed significant improvements in hardness and tensile strength over as-cast counterparts. The results confirm the effectiveness of the proposed method for enhancing structural performance, highlighting its suitability for applications demanding lightweight and durable materials.
Keywords
Al-5%Cu-4%Mg; hardness; metal matrix composites; semisolid forming; SiC reinforcement; tensile strength
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