PENGARUH VARIASI SUHU PENGECORAN PADA ALUMINIUM 7075

NUR SAFITRI, AMALIYAH (2022) PENGARUH VARIASI SUHU PENGECORAN PADA ALUMINIUM 7075. Tugas Akhir thesis, Institut Teknologi Dirgantara Adisutjipto.

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Abstract

Aluminum alloy 7075 is one of the aluminum alloys with Zn as the main alloy. This aluminum alloy is produced in many tempers, some of which are 7075-0, 7075- T6, 7075-T651. Based on the Al-Zn phase diagram, the melting point of aluminum alloy 7075 with wt% Standard Aluminum Association is at 660°C. This research was conducted by adding the temperature at each time of 30°C. The three pouring temperatures used are 690°C, 720°C and 750°C. The purpose of this temperature variation is to determine the effect of freezing time of aluminum alloy on physical and mechanical properties. Casting of 7075 aluminum alloy is carried out with three pouring temperatures of 690°C, 720°C into the mold and 750°C according to these temperatures. Casting was carried out to determine the effect of temperature on the microstructure and mechanical properties of 7075 aluminum alloy. Microstructure testing and made using ASTM standards. The results showed that the increase in the pouring temperature had an effect on the rate of freezing of the microstructure. The highest hardness value was obtained at 60.7 kgf/mm2 at a pouring temperature of 750°C. Impact toughness values do not show significant changes with temperature.

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