Semi-Solid Slurry Casting Using Gas Induced Semi-Solid Technique to Enhance the Microstructural Characteristics of Al-4.3Cu Alloy

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Semi-solid processing of Al-4.3%Cu (A206) alloy was performed by Gas Induced Semi-Solid (GISS) process in different condition. The flow rate of argon gas, starting temperature for gas purging (the temperature of superheated-melt) and the duration of gas purging were three key process variables which were changed during this investigation. It was found that inert gas purging near liquidus, significantly, led to the microstructural modification from fully dendritic to globular structure. Thermal analysis was successfully implemented through CA-CCTA technique to understand the cause of the microstructure change during GISS process. The results showed that gas purging into the melt leads to temperature drop of the melt to its liquidus just after a few seconds from start of gas purging. In fact, copious nucleation was induced by cooling effect of inert gas bubbles. Microstructural features were characterized in semi-solid as well as on conventionally cast samples. The optimum gas purging temperature, injection time, and inert gas flow rate was determined in semi-solid processing to obtain the best globularity in the microstructure of a long freezing range alloy. However, the microstructure of the conventionally cast sample was fully dendritic with shrinkage which affects the soundness of casting products.

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Periodical:

Solid State Phenomena (Volume 285)

Edited by:

Qiang Zhu, Ahmed Rassili, Stephen P. Midson and Xiao Gang Hu

Pages:

253-258

Citation:

M. Abdi and S.G. Shabestari, "Semi-Solid Slurry Casting Using Gas Induced Semi-Solid Technique to Enhance the Microstructural Characteristics of Al-4.3Cu Alloy", Solid State Phenomena, Vol. 285, pp. 253-258, 2019

Online since:

January 2019

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$41.00

* - Corresponding Author

[1] W.S. Miller, L. Zhuang, J. Bottema, A.J. Wittebrood, P. De Smet, A. Haszler, A. Vieregge, Recent development in aluminium alloys for the automotive industry, Materials Science and Engineering A280 (2000) 37–49.

DOI: https://doi.org/10.1016/s0921-5093(99)00653-x

[2] A. Lombardi, D. Sediako, A. Machin, C. Ravindran, R. MacKay, Effect of solution heat treatment on residual stress in Al alloy engine blocks using neutron diffraction, Materials Science & Engineering A 697 (2017) 238–247.

DOI: https://doi.org/10.1016/j.msea.2017.05.026

[3] A. Lombardi, W. Mu, C. Ravindran, N. Dogan, M. Barati, Influence of Al2Cu morphology on the incipient melting characteristics in B206 Al alloy, Journal of Alloys and Compounds 747 (2018) 131-139.

DOI: https://doi.org/10.1016/j.jallcom.2018.02.329

[4] S.Geng, P.Jiang, X.Shao, G.Mi, H.Wu, Y.Ai, C.Wang, C.Han, R.Chen, W.Liu, Comparison of solidification cracking susceptibility between Al-Mg and Al-Cu alloys during welding: A phase-field study, Scripta Materialia 150 (2018) 120–124.

DOI: https://doi.org/10.1016/j.scriptamat.2018.03.013

[5] J.Wannasin, D.Schwam, J.A. Yurko, C.Rohloff, G.Woycik, Hot tearing susceptibility and fluidity of semi-solid gravity cast Al-Cu alloy, Solid State Phenomena 116-117 (2006) 76-79.

DOI: https://doi.org/10.4028/www.scientific.net/ssp.116-117.76

[6] S.Janudom, J.Wannasin, P.Kapranos, S.Wisutmethangoon, The effect of hot tearing in semi-solid casting of aluminum A201 alloy, Advanced Materials Research 739 (2013) 190-195.

DOI: https://doi.org/10.4028/www.scientific.net/amr.739.190

[7] D.B. Spencer, R.Mehrabian, M.C. Flemings, Rheological behavior of Sn-15 Pct. Pb in the crystallization range, Metallurgical Transactions 3 (1972) 1925-1932.

DOI: https://doi.org/10.1007/bf02642580

[8] M.C. Flemings, R.G. Riek, K.P. Young, Rheocasting, Materials Science and Engineering 25 (1976) 103-117.

DOI: https://doi.org/10.1016/0025-5416(76)90057-4

[9] M.C. Flemings, Behavior of metal alloys in the semisolid state, Metallurgical Transactions A 22A (1991) 957-981.

DOI: https://doi.org/10.1007/bf02661090

[10] M.H. Ghoncheh, S.G. Shabestari, Effect of cooling rate on the dendrite coherency point during solidification of Al2024 alloy, Metallurgical and Materials Transactions 46A (2015) 1287-1299.

DOI: https://doi.org/10.1007/s11661-014-2697-z

[11] S.Nafisi, R.Ghomashchi, Semi-Solid Processing of Aluminum Alloys, Springer, 2016, Chapter 1.

[12] Information on http://www.gissco.com.

[13] J.Wannasin, R.A. Martinez, M.C. Flemings, A novel technique to produce metal slurries for semi-solid metal processing, Solid State Phenomena 116-117 (2006) 366-369.

DOI: https://doi.org/10.4028/www.scientific.net/ssp.116-117.366

[14] J.Wannasin, R.A. Martinez, M.C. Flemings, Grain refinement of an aluminum alloy by introducing gas bubbles during solidification, Scripta Materialia 55 (2006) 115-118.

DOI: https://doi.org/10.1016/j.scriptamat.2006.04.003

[15] M.H. Ghoncheh, S.G. Shabestari, M.H. Abbasi, Effect of cooling rate on the microstructure and solidification characteristics of Al2024 alloy using computer-aided thermal analysis technique, Thermal Analysis and Calorimetry 117 (2014) 1253-1261.

DOI: https://doi.org/10.1007/s10973-014-3867-3

[16] F.Czerwinski, Modern aspects of liquid metal engineering, Metallurgical and Materials Transactions B 48 (2017) 367-393.