Pengaruh Pre-strain 5% dan Temperatur Artificial Aging Terhadap Sifat Mekanik dan Mikrostruktur Aluminium 2024-T3

Padmavati, Azzahwa Fariha (2026) Pengaruh Pre-strain 5% dan Temperatur Artificial Aging Terhadap Sifat Mekanik dan Mikrostruktur Aluminium 2024-T3. Other thesis, Institut Teknologi Sepuluh Nopember.

Text 5011221156-Undergraduate_Thesis.pdf - Accepted Version Restricted to Repository staff only Download (38MB) | Request a copy

Abstract

Aluminium 2024-T3 merupakan paduan Al-Cu-Mg yang banyak digunakan pada aplikasi kedirgantaraan karena memiliki rasio kekuatan terhadap berat yang tinggi, dengan sifat mekanik yang sangat dipengaruhi oleh perlakuan termomekanik seperti pre-strain dan artificial aging. Penelitian ini bertujuan untuk menganalisis pengaruh pre-strain 5% terhadap sifat mekanik dan evolusi struktur mikro aluminium 2024-T3 setelah artificial aging, serta menentukan kondisi aging yang optimal untuk memperoleh kekuatan maksimum tanpa penurunan keuletan yang signifikan. Spesimen aluminium 2024-T3 diberi pre-strain 5% pada daerah gauge length dan dilakukan artificial aging pada temperatur 120°C, 140°C, 190°C, dan 210°C selama 8 jam. Karakterisasi meliputi analisis komposisi kimia menggunakan OES dan EDX, pengujian mekanik berupa uji tarik dan uji kekerasan, serta pengamatan mikrostruktur menggunakan metalografi, SEM, dan XRD. Hasil penelitian menunjukkan bahwa pre-strain 5% meningkatkan densitas dislokasi yang mempercepat kinetika presipitasi selama aging, sehingga meningkatkan kekuatan dan kekerasan material. Kondisi artificial aging pada temperatur 140°C menghasilkan sifat mekanik optimum dengan kombinasi kekuatan tinggi dan penurunan keuletan yang masih terbatas. Pada temperatur aging yang lebih tinggi terjadi fenomena over-aging yang menyebabkan penurunan kekuatan disertai peningkatan keuletan. Pengamatan mikrostruktur menunjukkan ukuran butir matriks α-Al relatif tidak berubah, sehingga mekanisme penguatan utama dikendalikan oleh evolusi presipitat. Analisis XRD mengidentifikasi fase dominan α-Al dengan presipitat Al2Cu (θ) dan Al2CuMg (S/S′), yang didukung oleh hasil OES, metalografi, dan EDX.
======================================================================================================================================
Aluminum 2024-T3 is an Al-Cu-Mg alloy widely used in aerospace applications due to its high strength-to-weight ratio, with mechanical properties that are strongly influenced by thermomechanical treatments such as pre-strain and artificial aging. This study aims to analyze the effect of a 5% pre-strain on the mechanical properties and microstructural evolution of aluminum 2024-T3 after artificial aging, as well as to determine the optimal aging condition to achieve maximum strength without a significant reduction in ductility. Aluminum 2024-T3 specimens were subjected to a 5% pre-strain in the gauge length region, followed by artificial aging at temperatures of 120°C, 140°C, 190°C, and 210°C for 8 hours. Characterization included chemical composition analysis using OES and EDX, mechanical testing through tensile and hardness tests, and microstructural observations using metallography, SEM, and XRD. The results show that the 5% pre-strain increases dislocation density, which accelerates precipitation kinetics during aging and leads to enhanced strength and hardness. The artificial aging condition at 140°C provides the optimum mechanical performance, achieving high strength with only a limited reduction in ductility. At higher aging temperatures, over-aging occurs, resulting in decreased strength accompanied by increased ductility. Microstructural observations indicate that the α-Al matrix grain size remains relatively unchanged, suggesting that the primary strengthening mechanism is governed by precipitate evolution. XRD analysis identifies α-Al as the dominant phase with the presence of Al2Cu (θ) and Al2CuMg (S/S′) precipitates, which is supported by OES, metallographic, and EDX analyses.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Aluminium, Artificial Aging, Pre-strain
Subjects:	T Technology > TN Mining engineering. Metallurgy T Technology > TN Mining engineering. Metallurgy > TN690 Metallography. Physical metallurgy T Technology > TN Mining engineering. Metallurgy > TN775 Aluminum alloys--Metallurgy.
Divisions:	Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	Azzahwa Fariha Padmavati
Date Deposited:	26 Jan 2026 09:50
Last Modified:	26 Jan 2026 09:50
URI:	http://repository.its.ac.id/id/eprint/130359

Actions (login required)

View Item