eprintid: 59263 rev_number: 20 eprint_status: archive userid: 24812 dir: disk0/00/05/92/63 datestamp: 2026-03-13 03:26:47 lastmod: 2026-03-13 03:26:47 status_changed: 2026-03-13 03:26:47 type: thesis metadata_visibility: show contact_email: helmiluthfi2001@gmail.com creators_name: Luthfi, Helmi creators_id: 3334190044 contributors_type: http://www.loc.gov/loc.terms/relators/THS contributors_type: http://www.loc.gov/loc.terms/relators/THS contributors_name: Suryana, Suryana contributors_name: Uswatun Hasanah, Indah contributors_id: 197402162001121001 contributors_id: 199012142019032022 corp_creators: Universitas Sultan Ageng Tirtayasa corp_creators: Fakultas Teknik Universitas Sultan Ageng Tirtayasa corp_creators: Jurusan Teknik Metalurgi title: PENGARUH PENAMBAHAN MASTER ALLOY AL-CU DAN PERSEN REDUKSI ROLLING TERHADAP SIFAT MEKANIK DAN STRUKTUR MIKRO ALUMUNIUM ALLOY 2024 ispublished: pub subjects: TL subjects: TN subjects: TS divisions: Metalurgi full_text_status: restricted abstract: Penelitian ini berjudul “Pengaruh Penambahan Master Alloy Al-Cu dan Persen Reduksi Rolling terhadap Sifat Mekanik dan Struktur Mikro Aluminium Alloy 2024”. Tujuan penelitian ini untuk menganalisis pengaruh variasi kadar tembaga (Cu) dan persen reduksi pengerolan dingin terhadap sifat mekanik serta struktur mikro aluminium alloy 2024 dengan perlakuan panas. Material dasar yang digunakan berasal dari skrap velg aluminium (Al-Si) yang dimodifikasi dengan penambahan magnesium (Mg) dan master alloy Al-Cu untuk memenuhi standar Aluminium Alloy 2024. Variabel penelitian meliputi kadar Cu (3,9%, 4,4%, dan 4,9%) serta variasi reduksi pengerolan dingin (10%, 20%, dan 30%). Proses T8 diawali dengan solution heat treatment, diikuti pendinginan cepat (quenching), pengerolan dingin, dan diakhiri dengan artificial aging. Karakterisasi dilakukan melalui uji tarik, uji kekerasan, dan pengamatan struktur mikro menggunakan metalografi. Hasil karakterisasi struktur mikro menunjukkan bahwa peningkatan persen reduksi pengerolan menyebabkan butir mengalami deformasi plastis yang signifikan, ditandai dengan pemanjangan butir searah arah pengerolan (rolling direction). Kehadiran dislokasi yang padat akibat pengerolan dingin berfungsi sebagai situs nukleasi heterogen yang mempercepat difusi atom Cu dan Mg, sehingga memicu pembentukan presipitat fasa yang lebih halus dan terdistribusi secara merata di dalam matriks. Analisis sifat mekanik menunjukkan korelasi positif antara peningkatan kadar Cu dan persen reduksi terhadap nilai kekerasan dan kekuatan tarik (Ultimate Tensile Strength). Kombinasi kadar Cu 4,9% dengan reduksi pengerolan 30% diproyeksikan memberikan penguatan mekanik maksimal melalui mekanisme ganda strain hardening dan precipitation hardening. Temuan ini mengonfirmasi bahwa optimasi parameter pengerolan dapat meningkatkan performa aluminium hasil daur ulang sehingga layak dipertimbangkan sebagai material alternatif untuk komponen struktural pesawat terbang. date: 2026-03-12 date_type: published pages: 97 institution: Fakultas Teknik Universitas Sultan Ageng Tirtayasa department: Teknik Metalurgi thesis_type: sarjana thesis_name: sarjana official_url: https://ft-untirta.ac.id/ referencetext: [1] Sun, L., Zhao, Y., Chen, J., Zhang, X. & Liu, H. 2021, ‘Effect of solution heat treatment on the microstructure and mechanical properties of 2024 aluminum alloy’, Journal of Materials Research and Technology, vol. 12, pp. 228–240. [2] Liang, M., Wang, Z., Liu, Y. & Zhao, Q. 2020, ‘Precipitation behavior and mechanical properties of Al–Cu alloys under various heat treatment parameters’, Materials Science and Engineering A, vol. 791, p. 139682. [3] Shackelford, J.F. 2015, Introduction to Materials Science for Engineers, 8th edn, Pearson Education. [4] Davis, J.R. 2001, Aluminum and Aluminum Alloys, ASM International. [5] Wessel, J. 2004, Handbook of Advanced Materials: Enabling New Designs, Wiley. [6] Irawan, Y.S. 2012, Material Teknik dan Pemilihan Material, Andi Offset. [7] Dursun, T., & Soutis, C. (2014). Recent developments in advanced aircraft aluminium alloys. Materials & Design, 56, 862-871. [8] Wang, J., Chen, Y., Zhai, K., Xue, R., & Ban, C. (2025). Effect of Cu content on the microstructure and properties of Al-Mg-Si alloys. Journal of Physics: Conference Series, 3080, 012124. [9] Sjölander, E., & Seifeddine, S. (2010). The heat treatment of Al-Si-Cu-Mg casting alloys. Journal of Materials Processing Technology, 210(10), 1249-1259. [10] Wang, Z., Dong, L., Hu, B., & Chen, B. (2023). The Effect of Cu Addition on Corrosion Resistance of Al-Si-Mg-Cr Alloy. Metals, 13(4), 795. [11] Ibrahim, M. F., Samuel, A. M., Samuel, F. H., & Doty, H. W. (2016). Effect of Aging Conditions on Precipitation Hardening in Al-Si-Mg and Al-Si-Cu-Mg Alloys. International Journal of Metalcasting, 10, 575–591. [12] Hennum, E., Marthinsen, K., & Tundal, U. H. (2024). Effect of Microstructure on the Precipitation of β-Mg2Si during Cooling after Homogenisation of Al-Mg-Si Alloys. Metals, 14(2), 215. [13] Kuchariková, L., Tillová, E., Uhríčik, M., & Belan, J. (2018). Porosity formation and fatigue properties of AlSiCu cast alloy. MATEC Web of Conferences, 157, 07003. [14] Dash, M., & Makhlouf, M. (2001). Effect of key alloying elements on the feeding characteristics of aluminum-silicon casting alloys. Journal of Light Metals, 1, 251-265. [15] Campbell, J. 2015, Complete Casting Handbook: Metal Casting Processes, Metallurgy, Techniques and Design, 2nd edn, Butterworth-Heinemann. [16] Matsuda, K., Daichou, H., Shiflet, G. J., & Ikeno, S. (2000). HRTEM Observation of GP Zones in Al-Ag Alloy. Materials Science Forum, 331-337, 1019-1024. [17] Wang, S. C., & Starink, M. J. (2005). Precipitates and intermetallic phases in precipitation hardening Al-Cu-Mg-(Li) based alloys. International Materials Reviews, 50(4), 193-215. [18] Zhou, M., Lin, Y. C., Deng, J., & Jiang, Y. Q. (2014). Hot tensile deformation behaviors and constitutive model of an Al-Zn-Mg-Cu alloy. Materials and Design, 59, 141-150. [19] Liu, F., Xin, R., Zhong, Y., & Liu, Q. (2025). Effect of cold rolling on aging precipitation and mechanical properties of magnesium-aluminum alloy. Journal of Magnesium and Alloys, 13, 2606-2617. [20] Zobač, O., Kroupa, A., Zemanová, A. & Richter, K.W. 2019. Experimental description of the Al–Cu binary phase diagram. Metallurgical and Materials Transactions A, 50(8), 3805–3815. https://doi.org/10.1007/s11661-019-05286-x. [21] Choi, S.W., Kim, Y.M., Lee, K.M., Cho, H.S., Hong, S.K., Kim, Y.C., Kang, C.S. & Kumai, S. 2014. [Effects of cooling rate and heat treatment on thermal conductivity of an Al–Cu–Mg–Si foundry alloy. Journal of Alloys and Compounds, 617, 654. https://doi.org/10.1016/j.jallcom.2014.08.033. [22] The Aluminum Association. 2013. Aluminum Standards and Data 2013 (Metric Units). The Aluminum Association, Arlington, VA, USA. [23] Timpel, D., Schemme, K., & Frommeyer, G. (2012). Microstructural development and mechanical properties of modified Al-Si alloys. Journal of Materials Science, 29, 549-554. [24] Belov, N. A. (2005). Phase composition of Al-Si-Cu-Mg alloys in the range of aluminum-rich solutions. Russian Journal of Non-Ferrous Metals, 35(1), 38-42. citation: Luthfi, Helmi (2026) PENGARUH PENAMBAHAN MASTER ALLOY AL-CU DAN PERSEN REDUKSI ROLLING TERHADAP SIFAT MEKANIK DAN STRUKTUR MIKRO ALUMUNIUM ALLOY 2024. S1 thesis, Fakultas Teknik Universitas Sultan Ageng Tirtayasa. document_url: https://eprints.untirta.ac.id/59263/1/Helmi%20Luthfi_3334190044_FullText.pdf document_url: https://eprints.untirta.ac.id/59263/2/Helmi%20Luthfi_3334190044_01.pdf document_url: https://eprints.untirta.ac.id/59263/3/Helmi%20Luthfi_3334190044_02.pdf document_url: https://eprints.untirta.ac.id/59263/4/Helmi%20Luthfi_3334190044_03.pdf document_url: https://eprints.untirta.ac.id/59263/5/Helmi%20Luthfi_3334190044_04.pdf document_url: https://eprints.untirta.ac.id/59263/6/Helmi%20Luthfi_3334190044_05.pdf document_url: https://eprints.untirta.ac.id/59263/7/Helmi%20Luthfi_3334190044_Ref.pdf document_url: https://eprints.untirta.ac.id/59263/8/Helmi%20Luthfi_3334190044_Lamp.pdf document_url: https://eprints.untirta.ac.id/59263/9/Helmi%20Luthfi_3334190044_CP.pdf