PENGARUH TEMPERATUR ARTIFICIAL AGING TERHADAP KEKERASAN UKURAN KRISTAL, KERAPATAN DISLOKASI, REGANGAN KISI, DAN KUAT TARIK PADUAN AA7075

Bagasakoro, Benedigtus Kunto (2024) PENGARUH TEMPERATUR ARTIFICIAL AGING TERHADAP KEKERASAN UKURAN KRISTAL, KERAPATAN DISLOKASI, REGANGAN KISI, DAN KUAT TARIK PADUAN AA7075. S1 thesis, Universitas Kristen Indonesia.

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Abstract

Paduan AA7075 telah lama dimanfaatkan untuk material konstruksi pada pesawat terbang, dan roket. Sehingga dibutuhkan kekuatan yang tinggi, tahan korosi, dan ringan. Tujuan penelitian adalah menganalisa pengaruh temperatur artificial aging terhadap ukuran kristal, kerapatan dislokasi, regangan mikro kisi kekerasan dan kuat tarik melalui perlakuan panas T6 terhadap paduan AA7075 untuk memperbaiki karakteristik sifat mekanik dan struktur kristal. Proses T6 dimulai dengan dipanaskan solid solution pada suhu 525 °C ditahan selama 1 jam, kemudian dilakukan pendingan celup cepat melalui media air, serta proses penuaan buatan (artificial aging) dengan variasi temperatur 160 °C, 210 °C dan 260 °C masing-masing 1jam. Setelah proses pendinginan, spesimen ini kemudian dilakukan proses metalografi dan karakterisasi. Hasil pengujian sifat mekanik menunjukkan bahwa temperatur artificial aging memengaruhi sifat mekanikmya pada paduan AA7075. Hasil pengujian kekerasan mengalami kenaikan sebesar 30,7% dari kekerasan 21,33HB menjadi 27,88HB. dan kuat tarik meningkat 30,7% dari 73,59MPa ke 96,19Mpa. Nilai ukuran kristal meningkat seiring dengan peningkatan temperatur artificial aging. Namun, sebaliknya nilai kerapatan dislokasi dan regangan mikro kisi mengalami penurunan pada paduan AA7075. Kata Kunci: Paduan AA7075, T6, artificial aging / The AA7075 alloy has long been utilized as a structural material in aircraft and rockets, requiring high strength, corrosion resistance, and light weight. The purpose of this study is to analyze the effect of artificial aging temperature on crystallite size, dislocation density, lattice microstrain, hardness, and tensile strength through T6 heat treatment of AA7075 alloy to improve its mechanical properties and crystal structure characteristics. The T6 process begins with solid solution heating at 525 °C held for 1 hour, followed by rapid quenching in water, and then artificial aging at temperature variations of 160 °C, 210 °C, and 260 °C for 1 hour each. After the cooling process, the specimens were subjected to metallographic examination and characterization. The mechanical property test results indicate that artificial aging temperature affects the mechanical properties of AA7075 alloy. Hardness test results showed an increase of 30.7%, from 21.33 HB to 27.88 HB, and tensile strength increased by 30.7% from 73.59 MPa to 96.19 MPa. Crystallite size values increase with rising artificial aging temperature. However, conversely, dislocation density and lattice microstrain values decrease in AA7075 alloy. Keywords: AA7075 alloy, T6, artificial aging

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