Pengaruh Holding Time Pada Solution Treatment Terhadap Karakteristik Fisik Dan Mekanik Paduan Al-Mg-Si Foam Dengan Space Holder Nacl

Ischaq, Miftakhul Arzaq Chusnul Maulana (2022) Pengaruh Holding Time Pada Solution Treatment Terhadap Karakteristik Fisik Dan Mekanik Paduan Al-Mg-Si Foam Dengan Space Holder Nacl. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Crashbox adalah komponen yang penting pada mobil karena dapat menyerap energi kinetik ketika terjadi benturan sehingga dapat meminimalisir cedera pada penumpang. Performa crashbox perlu ditingkatkan agar dapat lebih menjamin keselamatan dan keamanan penumpang dengan cara mengaplikasikan aluminium foam sebagai filler di dalamnya dan harus memenuhi spesifikasi tertentu. Penelitian ini bertujuan untuk menganalisis karakteristik fisik dan mekanik dari aluminium foam setelah diberi perlakuan panas precipitation hardening sehingga dapat memenuhi spesikasi tersebut. Pengujian komposisi kenggunakan Spark-OES dilakukan pada bahan penelitian yaitu paduan Al-Mg-Si yang kemudian dilebur dan dijadikan aluminium foam dengan NaCl sebagai space holder. Aluminium foam kemudian diberi perlakuan solution treatment pada temperatur 530 °C dengan variasi holding time selama 50 menit, 75 menit, dan 100 menit. Kemudian dilakukan quenching dengan udara dan dilakukan artificial aging. Pada ketiga variasi terjadi peningkatan lattice constant α�aluminium bila dibandingkan dengan spesimen tanpa perlakuan yang mengindikasikan adanya lattice strain yang ditimbulkan oleh keberadaan presipitat. Pada ketiga spesimen ini juga terdeteksi peak Mg2Si, yang artinya presipitat yang terbentuk adalah Mg2Si. Semakin lama holding time, lattice constant dari α-aluminium semakin kecil menunjukkan lattice strain semakin berkurang. Pada ketiga variasi memperlihatkan adanya bintik-bintik hitam yang berukuran sangat kecil dan tersebar merata pada matriks α-aluminium yang mengandung unsur paduan Mg dan Si. Kadar Si naik seiring bertambahnya holding time. Bila diasumsikan semua Si membentuk Mg2Si, maka kadar Mg2Si juga naik seiring bertambahnya durasi holding time. Semakin lama holding time mengakibatkan nilai kekerasan, kekuatan densifikasi, modulus young, dan kekuatan impak menurun sedangkan keuletan meningkat. Holding time selama 100 menit merupakan waktu yang optimal karena dapat menghasilkan kemampuan absorpsi energi yang tertinggi yaitu 15,282 MJ/m3 dengan kombinasi yang bagus antara kekuatan sebesar 78,735 MPa dan keuletan 44,225% serta modulus young 0,915 GPa.
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Crashbox is an important component in the car because it can absorb kinetic energy when a collision occurs to minimize injury to passengers. Crashbox performance needs to be improved to better ensure the safety and security of passengers by applying aluminium foam as a filler in it and must meet certain specifications. This study aims to analyze the physical and mechanical characteristics of aluminium foam after being heat treated with precipitation hardening so that it can meet these specifications. The composition test using Spark-OES was carried out on the research material, namely the Al-Mg-Si alloy which was then melted and made into the aluminium foam with NaCl as a space holder. The aluminium foam was then given solution treatment at a temperature of 530 °C with variations of holding time for 50 minutes, 75 minutes, and 100 minutes. Then it is quenched with air and artificial aging is done. In the three variations, there was an increase in the lattice constant of α-aluminium when compared to the untreated specimens which indicated the presence of lattice strain caused by the presence of the strengthening constituent. Mg2Si peaks were also detected in these three specimens, which means that the strengthening constituent was Mg2Si. The longer the holding time, the smaller the lattice constant of α-aluminium indicating that the lattice strain is decreasing. The three variations showed the presence of very small and evenly distributed black spots on the α-aluminium matrix containing alloying elements of Mg and Si. Si content increases with increasing holding time. If it is assumed that all Si forms Mg2Si, then the Mg2Si content also increases with increasing holding time duration. The longer the holding time causes the value of hardness, densification strength, Young's modulus, and impact strength to decrease while the ductility increases. Holding time for 100 minutes is the optimal time because it can produce the highest energy absorption capability of 15.282 MJ/m3 with a good combination of strength of 78.735 MPa and ductility of 44.225% and Young's modulus of 0.915 GPa

Item Type:	Thesis (Other)
Additional Information:	RSMt 671.36 Isc p-1 2022
Uncontrolled Keywords:	Aluminium foam, Paduan Al-Mg-Si, Mg2Si, Sifat mekanik, Solution , Aluminium foam, Al-Mg-Si alloy, Mg2Si, Mechanical properties, Solution treatment treatment
Subjects:	T Technology > TS Manufactures > TS205 Metals--Heat treatment.
Divisions:	Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	Mr. Marsudiyana -
Date Deposited:	13 Dec 2024 07:32
Last Modified:	13 Dec 2024 07:32
URI:	http://repository.its.ac.id/id/eprint/115966

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