TY - JOUR AU - Junus, Salahuddin AU - Zulfia, Anne AU - Melisa, Melisa AU - Mariani, Lilis PY - 2014 TI - PENGARUH WAKTU AGING TERHADAP KEKERASAN DAN STRUKTUR MIKRO KOMPOSIT Al-Si-Mg/Al2O3 DENGAN METODE STIR CASTING JF - ROTOR; Vol 7 No 2 (2014) KW - N2 - Aluminum composite needs proper aging period to achieve its optimum mechanical properties through  precipitation hardening process. In this research, alumina (Al 2 O 3 ) particulate reinforced aluminum alloy 6061 composite which is fabricated by stir casting method, undergoes T6 treatment in 175°C for 2 hours, 4 hours, 6 hours, and 8 hours. Mechanical properties evaluations such as tensile testing, hardness testing,  and wear rate testing; also microstructure and SEM observation are conducted. Research shows that the  optimum  artificial aging period for the aluminum composite is 6 hours in 175°C. Wear rate decreases after T6 treatment  applied. Hardness  increases after T6 treatment applied with aging period of 4 and 6 hours. Tensile strength decreases compared to as-cast composite due  to  formation  of  void  at  interface  when T6 treatment conducted. Manufacturing factors will affect the mechanical properties of composite. Keywords : Aluminum composite, billet Al.6061, T6, aging period, stir casting UR - https://jurnal.unej.ac.id/index.php/RTR/article/view/1614