Influence of Ti, B, and Sr on Microstructure, Mechanical and Tribological Properties of as Cast, Cast Aged, and Forge Aged A356 Alloy – A Comparative Study
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Influence of Ti, B, and Sr on Microstructure, Mechanical and Tribological Properties of as Cast, Cast Aged, and Forge Aged A356 Alloy – A Comparative Study

Authors: R. V. Kurahatti, D. G. Mallapur, K. Rajendra Udupa

Abstract:

In the present work, a comparative study on the microstructure and mechanical properties of as cast, cast aged and forged aged A356 alloy has been investigated. The study reveals that mechanical properties of A356 alloy are highly influenced by melt treatment and solid state processing. Cast aged alloys achieve highest strength and hardness compared to as cast and forge aged ones. Ones treated with combined addition of grain refiners and modifiers achieve maximum strength and hardness. Cast aged A356 alloy possesses higher wear resistance compared to as cast and forge aged ones. Forging improves both strength and ductility of alloys over as cast ones. However, the improvement in ductility is perceptible only for properly grain refined and modified alloys. Ones refined with 0.65% Al-3Ti shows highest improvement in ductility while ones treated with 0.20% Al-10Sr exhibits less improvement in ductility.

Keywords: Forged A356 alloy, Grain refinement, Modification, Wear

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1055793

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[1] C. Limmaneevichitr, W. Eidhed, "Fading mechanism of grain refinement of aluminum-silicon alloy with Al-Ti-B grain refiners", Material Science and Engineering A, Vol. 349, (1-2), 2003, pp. 197-206.
[2] C. H. Caceres, B.I. Selling, "Casting defects and the tensile properties of an Al-Si-Mg alloy", Material Science and Engineering A, Vol. 220, (1- 2), 1996, pp. 109-116.
[3] S. C. Jeng, S. W. Chen, "The Solidification characteristics of 6061 and A356 aluminium alloys and their ceramic particle-reinforced composites". Acta Materialia, Vol. 45 (12), 1997, pp. 4887-4877.
[4] G. Atxaga, A. Pelayo, A. M. Irisarri, Material Science and Technology, 2001, pp. 17:446.
[5] S. S Sreeja Kumari, R. M .Pillai, B. C. Pai, "Effect of iron in Al-7Si- 0.3Mg alloy", Indian Foundry Journal, Vol. 48, 1, 2002, pp. 27-31.
[6] T. Sagstad, N. Dahle, "Grain refining of hypoeutectic aluminium-silicon alloys with TiBloy, Proceedings of the Fifth International AFS Conference on Molten Aluminium Processing", American Foundry men-s Society, Orlando, 1998, pp.100-116.
[7] S. A. Kori. Grain refinement and modification of some hypoeutectic and eutectic Al-Si alloys, Ph. D Thesis, 2002, IIT Kharagpur.
[8] C. G. Kang, J. S. Choi, D. W. Kang, "A filling analysis of the forging process of semi-solid aluminum materials considering solidification phenomena," Journal of Materials Processing Technology, Vol. 73, 1998, pp. 289-302.
[9] A. D. Sarkar, "Wear of aluminium-silicon alloys", Wear, Vol. 31, 1975, pp. 331-343.
[10] Subramanian, "Some consideration towards the design of a wear resistant aluminium alloy", Wear, Vol. 155, 1992, pp 193-205.
[11] K. Dwivedi, "Wear behaviour of cast hypereutectic aluminium silicon alloys," Materials and Design, Vol. 27, 2006, PP. 610-616.
[12] Virupaxi Auradi, "Development of Al-Ti, Al-B and Al-Ti-B master alloys for grain refinement of Al-Si alloys", 2006, Ph. D thesis, VTU Belgaum.
[13] Chandrashekharaiah, T. M, "Studies on sliding wear behaviour of grain refined and modified hypoeutectic, eutectic and hypereutectic Al- Si alloys", 2007, Ph. D thesis, VTU Belgaum.
[14] Standard test method for wear testing with a pin-on-disc Apparatus, Designation: G 99-90 ASTM, 1916, Raco St. Philodolphia, PA 19103.