Enhancing Microstructure, Grain Refinement, and Wear Properties of Cast A356-TiB2 Composite through Improved Sequence of ECAP and Heat Treatment Processes
J. Min. Metall. Sect. B-Metall., 60 (3) (2024) 435-450. DOI:10.2298/JMMB240111035S
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Available online 17 decembar 2024
(Received 11 January 2024; Accepted 16 December 2024)
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The aim of this study was to improve the grain structure, hardness, and wear resistance of the composite material A356-1.5TiB2 through a combination of manufacturing processes. Initially, the composite material was produced by casting, followed by Equal Channel Angular Pressing (ECAP) and heat treatments in different sequences. The heat treatment process included a solution heat treatment (540 ºC, 4 hours), followed by rapid quenching in water (90 ºC). The ECAP process was carried out by the BA route and included four passes at room temperature. After the ECAP process, an aging process was conducted at 155 ºC for 3 hours. The subsequent ECAP and heat treatment had a positive effect on the distribution of TiB2 and TiAl3 particles, the grain refinement of the aluminum matrix and the improved hardness and wear properties of the composite. The composite that underwent both ECAP and heat treatment exhibited a finer grain structure and higher hardness. The order of post-treatment with ECAP and heat treatment also affected the grain structure, hardness and wear resistance of the composite. The composite that underwent solution treatment followed by aging treatment and then ECAP demonstrated the most refined structure and the highest hardness. These results show that a carefully designed manufacturing process can significantly improve the mechanical properties of A356-1.5TiB2 composite.
Keywords: Aluminum metal matrix composite; Grain structure; Equal Channel Angular Pressing (ECAP); Heat treatment; Hardness; wear
Correspondence Address:
A.S. Anasyida,
School of Materials & Mineral Resources Engineering, Universiti Sains Malaysia, Penang, Malaysia;
email: anasyida@usm.my
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