THE EFFECT OF COOLING RATE ON THE MICROSTRUCTURE OF ADC12 ALLOY WITH PRELIMINARY NUCLEATION ON COOLING SLOPE

Lê Minh Đức; Nguyễn Hồng Hải

doi:10.34238/tnu-jst.4789

THE EFFECT OF COOLING RATE ON THE MICROSTRUCTURE OF ADC12 ALLOY WITH PRELIMINARY NUCLEATION ON COOLING SLOPE

About this article

Received: 21/07/21 Revised: 14/10/21 Published: 15/10/21

Authors

1. Le Minh Duc , Le Quy Don Technical University
2. Nguyen Hong Hai, Hanoi University of Science and Technology

Abstract

In this paper, the effect of cooling rate on the microstructure of ADC12 alloy with preliminary nucleation on cooling slope is investigated experimentally. The equiaxed dendritic grains of α-Al surround by the fine eutectic structure is formed at all cooling rates that are decreasing from step 1 to step 4, resulting in increasing of α-Al grains size. The minimum size - about 30 μm - of α-Al grains was obtained everywhere in the 1 step with the cooling rate of 138 K.s^-1, while that in the 4th step with cooling rate reduced to 9,8 K.s^-1 was increased until 80 μm. The fine eutectic structure has plate-like form and the difference in their size in different steps is not too much. The equiaxed Si_I particles are appeared in all steps, with the size gradually increased from 1 to the 4th step with a significantly dropped cooling rate.

Keywords

Cooling rate; Al-Si Alloy; ADC12 Alloy; Microstructure; Cooling Slope

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References

[1] C. Tian, J. Law, J. Van Der Touw, M. Murray, J.-Y. Yao, D. Graham, and D. St. John, “Effect of melt cleanliness on the formation of porosity defects in automotive aluminium high pressure die castings,” Journal of Materials Process Technology, vol. 122, pp. 82–93, 2002.

[2] H. D. Zhao, F. Wang, Y. Y. Li, and W. Xia, “Experimental and numerical analysis of gas entrapment defects in plate ADC12 die castings,” Journal of Materials Process Technology, vol. 209, pp. 4537-4542, 2009.

[3] N. H. Hai, N. N. Tien, N. T. Tai, D. M. Duc, and P. Quang, Rheocasting. Bach Khoa Publishing House, 2017.

[4] T. Haga and P. Kapranos, “Simple Rheocasting processes,” Journal of Materials Processing Technology, Elsevier, vol. 130-131, pp. 594-598, 2002.

[5] W. Shaozhu, J. Zesheng, S. Sumio, and H. Maoliang, "Segregation behavior of ADC12 alloy differential support formed by near-liquidus squeeze casting," Materials and Design, vol. 65, pp. 591-599, 2015.

[6] Y. Birol, "Semisolid processing of near-eutectic and hypereutectic Al-Si-Cu alloys," Journal of materials Science, vol. 43, pp. 3577-3581, 2008.

[7] L. M. Duc, N. H. Hai, and M. T. Manh, "The hetero-structure formation of eutectic Al-Si alloy," Proceedings of National Conference on Mechanical and Transportation Engineering, vol. 2, pp. 149-154, 2017.

[8] American society for metals, Metals handbook ninth edittion Volume 2 Properties and selection: nonferrous alloys and pure metals, Ohio, USA, p. 170, 1990.

[9] H. H. Nguyen, Q. T. Nguyen, and M. D. Le, “Formation of heterostructure with appearance of α-Al phase in Hyper- and Eutectic Al-Si Alloys by Solidification at high rate,” Materials science forum, vol. 985, pp. 193-201, 2020.

DOI: https://doi.org/10.34238/tnu-jst.4789

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