Improvement of Microstructure and Mechanical Properties of Secondary AlSi8Cu2Mn Cast Alloy by Strontium

Abstract:

Present work is focused on study of the effect of Sr-modification (0 %; 0.03 % and 0.05 %) on the microstructure and mechanical properties of recycled AlSi8Cu2Mn cast alloy. For study and identification of intermetallic phases’ were utilized standard, colour and deep etching in order to reveal the three-dimensional morphology of the silicon particles and intermetallic phases. For element composition of the specimen was used X-ray analysis. Finally, the effect of modification on silicon morphology, mechanical properties (UTS, ductility, hardness and impact energy) was examined.The results show that the addition of Sr into AlSi8Cu2Mn cast alloy should act as a modifier, so it supposes to change the eutectic Si-morphology. However, its effect as a Si-modifier is not as significant as we have expected. Strontium refined and changed morphology of Si and thereby improves mechanical properties, first of all ductility and impact energy.

• Periodical: Materials Science Forum (Volume 891)
• Pages: 350-353
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.891.350
• Online since: March 2017
• Authors: Eva Tillová*, Mária Chalupová, Lenka Kuchariková, Juraj Belan, Alan Vaško, Ivana Švecová
• Keywords: Intermetallic Phases, Microstructure, Modification, Morphology, Secondary Al-Si Cast Alloy

References

[1] S.K. Das, J.A.S. Green, Aluminum industry and climate change - Assessment and responses, JOM. 62 (2010) 27-31.

DOI: 10.1007/s11837-010-0027-5

[2] A. Fabrizi, S. Ferraro, G. Timelli, The influence of Sr, Mg and Cu addition on the microstructural properties of a secondary AlSi9Cu3(Fe) die casting alloy, Materials Characterization. 85 (2013) 13-25.

DOI: 10.1016/j.matchar.2013.08.012

[3] M.M. Makhlouf, H.V. Guthy, The aluminium-silicon eutectic reaction: mechanisms and crystallography, Journal of Light Metals. 1 (2001) 199-218.

DOI: 10.1016/s1471-5317(02)00003-2

[4] E. Tillová, M. Chalupová, Structural analysis of Al-Si alloys, first ed., EDIS, Žilina, (2009).

[5] A. Knuutinen, K. Nogita, S.D. McDonald, A.K. Dahle, Modification of Al-Si alloys with Ba, Ca, Y and Yb, Journal of Light Metals. 1 (2001) 229-240.

DOI: 10.1016/s1471-5317(02)00004-4

[6] M.F. Ibrahim, E. Samuel, A.M. Samuel, A. Al-Ahmari, F.H. Samuel, Impact toughness and fractography of Al-Si-Cu-Mg base alloys, Materials & Design. 32 (2011) 3900-3910.

DOI: 10.1016/j.matdes.2011.02.058

[7] ASM Handbook. Vol. 15 - Casting, ASM International, (2002).

[8] F. Grosselle, G. Timelli, F. Bonollo: Doe applied to microstructural and mechanical properties of Al-Si-Cu-Mg casting alloys for automotive applications. Mater Sci Eng A. 527 (2010), 3536-3545.

DOI: 10.1016/j.msea.2010.02.029

[9] E. Tillová, M. Chalupová, L. Hurtalová, E. Ďuriníková, Quality control of microstructure in recycled Al-Si cast alloys, Manufacturing Technology. 11 (2011) 70-76.

DOI: 10.21062/ujep/x.2011/a/1213-2489/mt/11/1/70