Pengaruh Waktu Pemanasan T6 Terhadap Struktur Mikro, Kuat Tarik, dan Kekerasan Pada Paduan Aluminium Tipe 7075
Abstract
Telah dilakukan penelitian pengaruh penuaan buatan terhadap kekerasan, kuat Tarik, struktur mikro, dan komposisi unsur kimia pada paduan Al 7075. Tujuan penelitian untuk mengetahui pengaruh proses pemanasan T6 terhadap sifat mekanik khususnya kekerasan dan kuat Tarik pada paduan Al 7075. Pemanasan sintering pada suhu 450°C selama 1 jam. Kemudian di celup cepat dimedia air, selanjutnya pemanasan penuaan buatan pada suhu 210°C dengan waktu penahanan 1 jam dan 20 jam. Hasil pengujian kekerasan menunjukkan nilai kekerasan bertambah setelah disintering dan celup cepat, namun terjadi penurunan nilai kekerasan dengan waktu tahan yang lebih lama. Pengujian kuat Tarik pada paduan Al 7075 setelah proses T6 mengalami kuat Tarik yang berkurang dibanding sampel paduan Al 7075 sebelum proses pemanasan. Hasil pengamatan struktur mikro dengan SEM memperlihatkan terjadinya perubahan pasal yang ditandai dengan kenaikan kekerasan dan kuat Tarik.
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