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https://doi.org/https://doi.org/10.64486/m.66.2.8

Effect of Remelting and Recasting on Microhardness Distribution and Microstructural Evaluation of Aluminum Alloy 6061-T6

Azwar Yunus ; Doctoral Program-School of Engineering, Universitas Syiah Kuala, Jl. Tgk. Chik Pante Kulu No.5 Komplek Universitas Syiah Kuala, Banda Aceh 23111, Indonesia; Department of Mechanical Engineering, Politeknik Negeri Lhokseumawe, Jl. Banda Aceh-Medan KM. 280 Buketrata, Lhokseumawe 24301, Indonesia *
Akhyar Akhyar ; Doctoral Program-School of Engineering, Universitas Syiah Kuala, Jl. Tgk. Chik Pante Kulu No.5 Komplek Universitas Syiah Kuala, Banda Aceh 23111, Indonesia; Department of Mechanical Engineering, Universitas Syiah Kuala, Jl. Syech Abdurrauf No.7 Darussalam, Banda Aceh 23111, Indonesia *
Iskandar Hasanuddin ; Doctoral Program-School of Engineering, Universitas Syiah Kuala, Jl. Tgk. Chik Pante Kulu No.5 Komplek Universitas Syiah Kuala, Banda Aceh 23111, Indonesia; Department of Mechanical Engineering, Universitas Syiah Kuala, Jl. Syech Abdurrauf No.7 Darussalam, Banda Aceh 23111, Indonesia
Agus Sasmito ; Doctoral Program-School of Engineering, Universitas Syiah Kuala, Jl. Tgk. Chik Pante Kulu No.5 Komplek Universitas Syiah Kuala, Banda Aceh 23111, Indonesia; Research Center for Hydrodynamic Technology, National Research and Innovation Agency of Indonesia, Jl. Hidrodinamika, Sukolilo, Surabaya 60112, Indonesia

* Dopisni autor.

Sažetak

Aluminum Alloy 6061-T6 is widely used in engineering applications because of its favorable mechanical properties, corrosion resistance, and formability. This study investigated the effect of a single remelting and recasting cycle on the microstructure and spatial distribution of microhardness of Aluminum 6061-T6. The alloy was remelted at approximately 800 °C and gravity cast into a metal mold. Microstructural characterization was performed using optical metallurgical microscopy, while Vickers microhardness was measured at multiple locations across the casting. The wrought material exhibited a relatively homogeneous microstructure with fine and uniformly distributed microstructural features and an average hardness of 134 HV0.5. After remelting and recasting, the average hardness decreased to approximately 89 HV0.5, with values ranging from 80 HV0.5 to 103 HV0.5. Optical microscopy showed a coarser and more heterogeneous microstructure after recasting, together with features consistent with casting-related imperfections. The observed reduction and spatial variation in microhardness were associated with the transition from the original precipitation-hardened T6 condition to a more heterogeneous as-cast microstructure.

Ključne riječi

aluminum alloy 6061-T6; remelting; recasting; microstructure evolution; hardness distribution; precipitation hardening

Hrčak ID:

352428

URI

https://hrcak.srce.hr/352428

Datum izdavanja:

1.4.2027.

Posjeta: 0 *