Improving of Microstructure and Mechanical Properties of Al-A356 Alloy with Compo-Casting Method

Document Type : Persian

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Abstract

Aluminum/alumina composites are used in automotive and aerospace industries due to their low density and good mechanical strength. In this research, the effect of mechanical stirring of slurry in liquid-solid phase temperature and injection of alumina powder with inert gas (Ar) on microstructure and mechanical properties of Al-A356 alloy is investigated. In order to improve of the wettability and homogenous distribution of alumina powder in the Al–matrix, heat treatment of alumina particles in 1100 ̊C for 20 min before injection in slurry is done. In this study, compo-casting method was used to fabricate aluminum matrix composite reinforced with micro alumina particles. To investigate the mechanical properties of hardness tests, impact and compression test are employed. Mechanical results showed that the stirring of slurry and addition of alumina improved the hardness, compression strength and impact energy. Using alumina particles and compo-casting process the best mechanical properties are obtained. Finally, the hardness, compression strength and impact energy of the samples that were produced by compo-casting method are compared to the convectional casting and showed an increase of 37, 231 and 51 percent, respectively

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References

[1] Lapkowski W., Some studies regarding thixoforming of metal alloys, Journal of Materials Processing Technology, vol. 80–81, 1998, pp. 463-468.
[2] Vencl A., Bobic I., Arostegui S., Bobic B., Structural, mechanical and tribological properties of A356 aluminium alloy reinforced with Al2O3, SiC and SiC + graphite particles. Journal of Alloys and Compounds, vol. 506, 2010, pp. 631-639.
[3] Mazahery A., Abdizadeh H., Baharvandi H.R., Development of high-performance A356/nano-Al2O3 composites, Materials Science Engineering A, vol. 518, 2009, pp. 61-64.
 [4] Sajjadi S.A., Ezatpour H.R., Beygi H., Microstructure and mechanical properties of Al–Al2O3 micro and nano composites fabricated by stir casting, Proceedings of 14th national conference on Materials Science and Engineering, 2010, Tehran, Iran. pp. 325-332.
[5] Sajjadi S.A., Torabi Parizi M., Ezatpour H.R., Sedghi A., Fabrication of A356 composites reinforced with micro and nano Al2O3 particles by a developed compocasting method and study of their properties, Journal of Alloys and Compounds, vol. 511, 2012, pp. 226-231.
[6] Sevik H., Can Kurnaz S., Properties of alumina particulate reinforced aluminum alloy produced by pressure die casting, Journal of Materials Design, vol. 27, 2006, pp. 676-683.
[7] Kirkwood D. H.,  Suery M., Kapranos P., Atkinson H. V., Young K. P., Semi-Solid Processing of Alloys, Springer Series in materials science, 2009, Cambridge, MA.
[8] Spencer D.B., PhD thesis, MIT, 1971, Cambridge, MA.
[9] Kamarei A.,  Nourouzi S., Bakhshi M., Gorji A. H., An investigation on the effect of mechanical stirring parameters on mechanical properties of A360 aluminum alloy in semi-solid forming, Journal of Tehran Uni. Engineering Faculty (in Persian), vol. 43, 2009, pp.751.759.
[10] Ezatpour H.R., Torabi-Parizi M., Sajjadi S.A., Microstructure and mechanical properties of extruded Al/Al2O3 composites fabricated by stir-casting process, Transaction of Nonferrous Metal Society of China, vol. 23, 2013, pp. 1262-1268.
[11] Hossein-Zadeh M., Mirzaee O., Saidi P., Structural and mechanical characterization of Al-based composite reinforced with heat treated Al2O3 particles, Journal of Materials and Design, vol. 54, 2014, pp. 245-250.
[12] Kannikeswaran K., Lin R.Y., Trace element effects on aluminium silicon carbide interfaces. Springer, vol. 39, 1987, pp. 17-19.
[13] Parka C., Kima S., Kwon Y., Lee Y., Lee J., Mechanical and corrosion properties of rheocast and low-pressure cast A356-T6 alloy, Materials Science and Engineering A, vol. 391, 2005, pp. 86-94.
Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering
Volume 7, Issue 1 - Serial Number 1
September 2014
Pages 63-72

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