Darmawan, Rieco Malik (2014) Pengaruh temperatur aging dan waktu holding aging presipitasi hardining pada struktur mikro sifat mekanik paduan Mg-5Al- 1%Y untuk aplikasi komponen otomotif temperatur tinggi. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Paduan magnesium banyak diaplikasikan pada dunia otomotif mobil
atau motor dan mesin pesawat terbang. Hal ini dikarenakan berat
dari magnesium sendiri yang sangat ringan dan memiliki kekuatan
tinggi. Serta paduan magnesium memiliki konduktifitas termal yang
baik, modulus elastisitas yang tinggi dan memiliki sifat mekanik yang
baik. Pada penelitian ini menggunakan paduan Mg 5Al 1%Y proses
conventional melting pada temperatur 7200C waktu holding 1 jam
dan didinginkan secara lambat. Variasi temperatur aging adalah
1500C, 2000C dan 2500C dan waktu holding aging 8 jam, 16 jam dan
24 jam. Tujuan dilakukan penelitian ini adalah untuk mengetahui
pengaruh temperatur dan waktu holding aging terhadap mikro
struktur, kekerasan dan stabilitas termal. Hasil pengujian
karakterisasi yang menggunakan alat uji XRD yang menunjukkan
adanya fasa α-Mg, β-Mg17Al12 dan Al2Y. Hasil pengujian kekerasan
pada temperatur 1500C sebesar 71.84 HB, 74.12 HB, 75.94 HB;
temperatur 2000C sebesar 79.80 HB, 81.40 HB, 82.79 HB;
temperatur 2500C sebesar 89.26 HB, 82.44 HB, 84.26 HB. Hasil
koefisien termal yang sesuai dengan aplikasinya adalah ketika
temperatur aging 2000C waktu holding 16 jam dengan nilai koefisien
termal sebesar 26.73 ppm0C-1.
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Magnesium alloys was applied in the automotive world cars or
motorcycles and aircraft engines. This is because the weight of the
magnesium is very lightweight and have high strength. Magnesium
alloys have good thermal conductivity, high elastic modulus and
good mechanical properties. In this study using Mg-5Al-1%Y alloys
conventional melting process at temperature 720°C with holding
time at 1 hour and cooled slowly. Variations aging temperature is
150°C, 200°C and 250°C and holding time aging is 8 hours, 16
hours and 24 hours. The purpose of this study was to determine the
effect of aging temperature and holding time on the microstructure,
hardness and thermal stability. Characterization test results using
XRD show phase α-Mg, β-Mg17Al12 and Al2Y. Hardness testing result
at temperature of 150°C is 71.84 HB, HB 74.12, and 75.94 HB;
temperature of 200°C is 79.80 HB, 81.40 HB, and HB 82.79;
temperature of 250°C is 89.26 HB, 82.44 HB, and HB 84.26. The
results of the thermal coefficient corresponding to the application is
when the aging temperature of 200°C with holding time 16 hour with
the value of the thermal coefficient of 26.73 ppm°C-1.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSMt 671.36 Dar p |
| Uncontrolled Keywords: | Panduan Mg-5Al- 1%Y; persipitasi hardering; metalografi; XRD; hardues |
| Subjects: | T Technology > TN Mining engineering. Metallurgy > TN752.I5 Steel--Heat treatment |
| Divisions: | Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | - Taufiq Rahmanu |
| Date Deposited: | 10 Jul 2019 02:06 |
| Last Modified: | 10 Jul 2019 02:06 |
| URI: | http://repository.its.ac.id/id/eprint/63777 |
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