Study Pengaruh Penambahan Mg pada AL6061 Terhadap Sifat Mekanis, Hardness, dan Impack Aplikasi Baling-baling Perahu Ketek
DOI:
https://doi.org/10.22441/jtm.v12i2.20049Abstract
Perahu merupakan alat tranportasi untuk penyeberangan sungai dan nelayan,dimana komponen penggerak utama baling-baling, permasalahan baling-baling ini bisa retah dan patah diakibatkan benturan dengan benda lain. Dengan permasalahan diatas peneliti melakaukan studi rekayasa paduan material antara Al6061 bekas dan penambahan unsur Magnesium. Tujuan dari penelitian adalah untuk mengetahui apakah penambahan Mg berpengaruh terhadap sifat mekanik dan komposisi unsur penyusun suatu material paduan berdasarkan hasil peleburan kembali Al6061 bekas. Sifat mekanik dianalisis melalui pengujian kekuatan impak dan kekerasan rockwell. Jumlah Mg yang ditambahkan bervariasi 5%, 15%, dan 25%. proeses pengecoran menggunakan suhu 650°C-700°C. Hasil unsur penyusun komposisi paduan yang dominan antara lain Carbon, Magnesium dan Alumunium , hasil pengujian impak terjadi adanya kenaikan nilai impak disetiap penambahan prosentase Magnesium, hal ini menunjukkan bahwa material memilki ketangguhan,keuletan dan tahan terhadap beban kejut. Nilai impak terkecil diperoleh untuk perubahan 5 %Mg sebesar 12,70 Nm/cm² , sedangkan nilai kekuatan impak tertinggi sebesar 16,13 Nm/cm² pada 25%Mg. Hasil kekerasan terjadi penurunan setiap penanmbahan magnesium dimana 5% Mg 93 HR, 15%Mg 77 HR, dan 25%Mg 38,33 HR.
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