Heryansyah, Hafiz (2015) Pengaruh Temperatur Aging dan Waktu Holding Aging terhadap Perubahan Struktur Mikro dan Sifat Mekanik pada Presipitasi Hardening Paduan Mg-5Al-3.5Ca. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Magnesium (Mg) merupakan material struktur yang
ringan dengan nilai densitas sebesar 1.78 g/cm3 dibandingkan
dengan material yang biasanya digunakan seperti Aluminium (Al)
dan besi (Fe). Sifat lain yang juga dimiliki oleh paduan magnesium
adalah konduktivitas termal dan sifat mekanik yang baik serta
modulus elastisitas yang tinggi. Karena keunggulannya inilah,
banyak industri manufaktur yang mengembangkan magnesium
dalam bentuk paduan untuk berbagai aplikasi. Penelititan ini
menganalisis pengaruh dari temperatur aging dan waktu holding
aging terhadap perubahan struktur mikro dan sifat mekanik
melalui perlakuan presipitasi hardening pada unsur Mg, Al, dan
Kalsium (Ca) yang dipadukan dengan rasio komposisi 91.5: 5: 3.5.
Temperatur aging yang digunakan adalah 2500C dan 3000C
dengan variasi waktu holding selama 12, 24, dan 36 jam. Setelah
dilakukan pengujian struktur mikro, difraksi sinar-X, dan hardness
didapatkan bahwa fase yang terbentuk adalah αMg, Mg17Al12,
Mg2Ca, dan fase eutektik dari Mg-Mg17Al12 dan Mg-Mg2Ca serta
peningkatan temperatur dan penambahan waktu tahan aging
menyebabkan perubahan kuantitas pembentukan dari fase Mg2Ca
dan Mg17Al12 yang
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Magnesium (Mg) is a very lightweight structure material
with a density value of 1.78 g / cm3 compared with materials that
are commonly used such as aluminum (Al) and iron (Fe). Other
properties were also owned by the magnesium alloy is a good
thermal conductivity and high elasticity modulus. Because of its
advantages, many of manufacturing industries develop magnesium
alloy for various applications. Magnesium alloy development is
done by improving mechanical properties such as hardness and
strength. This study analyzed the effect of aging temperature and
holding aging time in microstructure and mechanical properties
transformation through precipitation hardening treatment for
alloyed elements of Mg, Al, and Calcium (Ca) with composition
ratio of 91.5: 5: 3.5. Aging temperatures used were 2500C and
3000C with holding time variations for 12, 24, and 36 hours. The
microstructure, X-ray diffraction (XRD), and Hardness testing
showed that the phase formed is αMg, Mg17Al12, Mg2Ca and
eutectic phase of Mg-Mg17Al12 and Mg-Mg2Ca and as well as rising
temperature and aging holding time cause changes in the forming
quantity of the Mg2Ca and Mg17Al12 phase that influence a turning
value of hardness.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSMt 671.36 Her p |
| Uncontrolled Keywords: | paduan magnesium, Mg-Al-Ca, presipitasi hardening, aging. |
| Subjects: | T Technology > TN Mining engineering. Metallurgy > TN693.M3 Magnesium |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | Yeni Anita Gonti |
| Date Deposited: | 14 Feb 2020 07:02 |
| Last Modified: | 14 Feb 2020 07:02 |
| URI: | http://repository.its.ac.id/id/eprint/74948 |
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