Wahyono Soeprapto, Erwin, Sudjito, Yudy Surya Irawan, Asmadi Lubay, I. Rasta Satya
This paper describes the solubility of nickel alloys in molten Al-Si alloys at 900°C to form Al-Si-Ni alloys. The melting point of nickel metal is 1450°C and the melting point of aluminum silumin alloy is 600-760°C. Solid phases: a-Al, AlSi, Si, and Mn-Fe-Si intermetallic are microstructures in Silumin with different geometries, expansion coefficients, and mechanical properties. The uncontrolled ferro-manganese intermetallic phase in aluminum alloys triggers cracking and reduces manufacturing properties. The phenomenon of nickel solubility in a liquid silumin bath at 900°C besides reducing the melting energy can also increase ductility through controlling metallographic characteristics. The independent variable in this study was the weight of nickel in each smelter: 2, 4, 6, 8, and 10% by weight of the ADC12 ingot. The dependent variable is the characterization of the ADC12+Ni alloy consisting of nickel solubility, type, shape, and solid fraction. Testing of chemical elements was carried out by optical emission spectrometry, metallography was carried out by optical microscopy, and the phase fractions were carried out using the ImageJ software application. Melting point solid nickel of 1450°C can dissolve in ADC12 melt at a temperature of 600 to 900°C at a holding time of 45 minutes. The amount of nickel dissolved in ADC12 continues to increase in line with the weight of the nickel melted. The weight percent of dissolved nickel and nickel with the intermetallic fraction Al-Ni in the Al-Si-Ni alloy immersion 2, 4, 6, 8, and 10 Ni respectively is 2.98-2, 5.04-3, 6.97-8, 8.13-10, and 10.02- 10 in [%]. © 2025 Institute of Physics Publishing. All rights reserved.
Brawijaya University, MT Haryono 167, Malang, 65145, Indonesia; IBA University, Mayor Ruslan, Palembang, 30164, Indonesia
