Cahyo Kuncorojati, Poppy Puspitasari, M. Mirza Abdillah Pratama, Avita Ayu Permansari, Sukarni Sukarni
The usage of aluminium as an alloy has great demands in the construction, aerospace/aircraft, especially in the automotive sector. Almost all frames and engine construction are made of aluminium alloy. The advantages of aluminium include its lightweight metal, corrosion resistance, good electrical conductor, easy integration with other metals, and machinability. Al-Si alloys in the automotive sector, such as conditional pistons are very suitable because of their wear resistance, corrosion resistance, and lightness properties. This study aimed to identify the effect of adding copper to the Al-Si alloy to obtain the Al-Si-Cu alloy, which was expected to provide mechanical strengthening and microstructure from the stir casting process. The mechanical toughness test results showed an increase in toughness at the addition of 1.5 wt% with a value of 0.0977?J/mm2. Simultaneously, the raw material had a value of 0.0707?J/mm2, gradually decreased with the addition that exceeded 1.5 wt%, namely 2.5 wt% addition resulted in a value of 0.0661?J/mm2, and the addition of 3.5 wt% with a value of 0.0578?J/mm2. The formed microstructure showed continuous smaller granules with increasing Cu percentage, while the dendrites had slender characteristics that increased with increasing Cu percentage. © 2022 Author(s).
Mechanical Engineering Department, Engineering Faculty, Universitas Negeri Malang, Semarang St. No. 5, East Java, Malang, Indonesia; Center of Advanced Materials and Renewable Energy, Universitas Negeri Malang, Semarang St. No. 5, East Java, Malang, Indonesia; Civil Engineering Department, Engineering Faculty, Universitas Negeri Malang, Semarang St. No. 5, East Java, Malang, Indonesia