Pengaruh penambahan yttrium (y) terhadap struktur mikro dan sifat mekanik paduan Mg-6Zn

Hutasoit, Advent H (2014) Pengaruh penambahan yttrium (y) terhadap struktur mikro dan sifat mekanik paduan Mg-6Zn. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Magnesium merupakan logam paling ringan ( densitas 1.80 gr/cm3). Dengan densitas paling rendah diantara semua logam, Magnesium ( Mg ) telah membuka peluang baru pada pengembangan material ringan dimana sifat mekanik yang tinggi diperlukan dengan berat material yang rendah Magnesium-zinc dipadukan dengan yttrium dengan prosentase; 0.5; 1; 1.5; 3 dilebur didalam furnace. temperatur yang digunakan untuk melebur adalah 7400C dan waktu penahanan adalah 50 menit. logam cair didinginkan secara lambat dialam furnace hingga mencapai temperatur kamar. Hasil penelitian menunjukkan bahwa penambahan Yttrium meningkatkan. Nilai kekerasan,dan menurunkan thermal ekspansi paduan magnesium . Nilai kekerasan tertinggi terdapat pada paduan dengan 3 wt%Y yaitu 96.26 BHN, sementara nilai nilai koefisien thermal ekspansi terendah terdapat pada paduan dengan 1.5wt% Y yaitu 22.45 ppm/C.peningkatan kekerasan ini dipercaya karena penghalusan butir dan timbulnya fasa fasa baru yang tersusun secara lamellar pada secondary phase. ================================================================================================== Magnesium is the lightest metal (density 1.80 gr/cm3). With the lowest density among all metals, magnesium (Mg) has opened the new opportunities in the development of lightweight materials where high mechanical properties required by the low weight of the material. Magnesium-zinc were alloyed with variable 0. 5, 1, 1.5, and 3 wt% of yytrium melted in the furnace. The alloy melted at 7200C held for 50 minutes and slowly cooled in the furnace until it reaches room temperature . The Result was showing that the addition of yttrium increased the hardness and decreased the thermal expansion of the alloys. The Highest hardness was obtained from 3 wt% Y alloy by 96.26 BHN. Lowest thermal expansion was obtained from 1.5 wt%Y alloy by 22.45 ppm/C. The high strengths of the alloys were thought due to the hardening by the grain refinement and the appearance of new phases structured in lamellar in the secondary phase.

Item Type: Thesis (Undergraduate)
Additional Information: RSMt 669.723 Hut p
Uncontrolled Keywords: Magnesium; Yttrium; Magnesium-zinc; Kekerasan; Koefisien thermal ekspansi
Subjects: T Technology > TN Mining engineering. Metallurgy > TN693.M3 Magnesium
Divisions: Faculty of Industrial Technology > Material & Metallurgical Engineering > (S1) Undergraduate Theses
Depositing User: - Taufiq Rahmanu
Date Deposited: 11 Jul 2019 02:19
Last Modified: 11 Jul 2019 02:19
URI: http://repository.its.ac.id/id/eprint/63833

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