Characterisation of Intermetallic Phases in Multicomponent Al-Si Casting Alloys for Engineering Applications


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Multicomponent Al-Si based casting alloys are used for a variety of engineering applications. The presence of additional elements in the Al-Si alloy system allows many complex intermetallic phases to form, which make characterisation non-trivial due to the fact that some of the phases have either similar crystal structures or only subtle changes in their chemistries. A combination of electron backscatter diffraction (EBSD) and energy dispersive X-ray analysis (EDX) have therefore been used for discrimination between the various phases. It is shown that this is a powerful technique for microstructure characterisation and provides detailed information which can be related to microstructure evolution during initial casting and subsequent heat treatment. The mechanical properties of different intermetallic phases have been investigated as a function of temperature using the nanoindentation technique. In particular, the hardness and modulus of a number of phases have been established for a range of alloy compositions. Physical properties of some of the intermetallic phases are also discussed. Phase identity, composition, physical and mechanical properties are set in context to inform alloy design strategies.



Materials Science Forum (Volumes 519-521)

Edited by:

W.J. Poole, M.A. Wells and D.J. Lloyd




C.L. Chen et al., "Characterisation of Intermetallic Phases in Multicomponent Al-Si Casting Alloys for Engineering Applications", Materials Science Forum, Vols. 519-521, pp. 359-364, 2006

Online since:

July 2006




[1] J.L. Hay and G.M. Pharr: ASM Handbook, 2002, 8: p.232.

[2] W.C. Oliver and G.M. Pharr: J Mater Research, 1992, 7: p.1564.

[3] L. Margulies, M.J. Kramer, R.W. McCallum, S. Kycia, D.R. Haeffner, J.C. Lang and A.I. Goldman: Rev. of Sci. Inst., 1999, 70(9): p.3554.

[4] V. Randle: Microtexture Determination and its Applications, (2nd Edition), Maney Publishing, (2003).

[5] A.K. Dahle, K. Nogita, J.W. Zindel, S.D. McDonald and L.M. Hogan: Metallugical and Materials Transactions A,. 2001, 32A: p.949.

[6] S. Nayak, L. Riester and N.B. Dahotre: J. Mater. Res., 2004, 19: p.202.

[7] S.W. Youn, P.K. Seo and C.G. Kang: J. Mater. Processing Technology, 2005, 162: p.260.

[8] J.I. Jang, M.J. Lance, S. Wen, T.Y. Tsui and G.M. Pharr: Acta Materialia, 2005, 53: p.1759.

[9] D. Beegan, S. Chowdhury and M.T. Laugier: Thin Solid Films, 2004, 466: p.167.

[10] J.F. Smith and S. Zheng: Surface Engineering, 2000, 16: p.143.

[11] H. Hafez and M.M. Farag: J. Mater. Sci., 1981, 16: p.1223.

[12] L.F. Mondolfo: Aluminum Alloys, Structure and properties, Butterworths, (1976).

[13] G.W. Kaye and T.H. Laby: Tables of physical and chemical constants, Harlow, Longman, (1995).

[14] A.J. Thom, M.K. Meyer, Y. Kim and M. Akinc: Processing and fabrication of advanced materials III, Warrendale, USA, Eds. V.A. Ravi, T.S. Srivatsan and J.J. Moore, TMS, 1994: p.413.

[15] G. Frommeyer, R. Rosenkranz and C. Lüdecke: Z. Metallkunde, 1990, 81: p.307.

[16] R.S. Qin, E.R. Wallach and R.C. Thomson: J. Crystal Growth, 2005, 279(1-2): p.163.