Kebutuhan material dengan sifat mekanik yang baik serta berbobot ringan sudah semakin tinggi saat ini, terutama untuk aplikasi yang memerlukan performa tinggi. Komposit aluminium berpenguat Al2O3 (AMC) menawarkan keunggulan tersebut. Pada penelitian ini, fabrikasi komposit dilakukan menggunakan paduan aluminium 6061 dan penguat serbuk Al2O3 berukuran 60 μm. melalui proses stir casting. Dalam penelitian ini diketahui pengaruh penambahan kadar Al2O3 serta Mg sebagai agen pembasahan terhadap sifat mekanik komposit. Variasi kadar Al2O3 yang ditambahkan sebesar 10% dan 15% fraksi volume serta kadar Mg 8%, 10%, dan 15%. Hasil penelitian menunjukan bahwa kekuatan tarik optimal sebesar 170 Mpa diperolah pada komposit dengan kadar Al2O3 10% dan Mg 10%. Di mana kekerasan dan ketahanan aus komposit meningkat seiring penambahan kadar Al2O3 dan Mg. Demikian halnya porositas meningkat ketikat kadar Al2O3 yang ditambahkan semakin besar.

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Demand of materials with good mechanical properties and have lightweight increased in recent years especially for high performance applications. Aluminium reinforced Al2O3 composite (AMC) provide this superiority. In this research, composite was fabricated from Aluminium Alloy 6061 and 60 μm Al2O3 reinforce particles by stir casting process. This research investigated the effect of addition Al2O3 content and Mg as wetting agent to mechanical properties of composite. The addition of Al2O3 into Al melt was 10% and 15% of volume fraction and Mg was 8%, 10%, and 15%. The result showed that the optimum tensile strength of 202 Mpa was obtained in composite with 10% volume fraction of Al2O3 and 10% Mg. Moreover, hardness and wear resistant of composite increased with the addition of Al2O3 and Mg content. Porosity also increased when greater amount of Al2O3 content was added.