Abstract
The composition profile and the microstructure formation of unidirectionally solidified Al–4.5 wt% Cu sample was investigated. The thermal analysis technique determined the vertical Bridgman’s test sample solidification parameters. Characterization of microstructures was conducted with an optical microscope, and Image-J software determined the α-Al area. Energy-dispersive X-ray spectroscopy was used to assess the composition. The composition profile was confirmed with the actual density and micro-hardness value. The results show that the composition of Cu varies between 4.93 and 3.99%, along with the 98.3% drop in the cooling rate. The reduction of Cu composition is in line with the α-Al area, actual density, and micro-hardness value. Two different morphologies of eutectics are found, fine internal fragments in 1.12 to 2.4 °C/s (less than 35 mm) and the lamellar in 0.04 to 0.06 °C/s cooling zone (more than 35 mm).
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Great appreciation to the Ministry of Research, Technology and Higher Education of the Republic of Indonesia and Indonesia Endowment Fund for Education (LPDP) for providing financial support with contract no. PRJ-1435/LPDP.4/2019.
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Masnur, D., Malau, V. & Suyitno, S. Composition Profile and Microstructure Formation of Unidirectionally Solidified Al–4.5 wt% Cu. Inter Metalcast 16, 349–358 (2022). https://doi.org/10.1007/s40962-021-00598-4
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DOI: https://doi.org/10.1007/s40962-021-00598-4