Three Dimensional Morphology of Mn Rich Intermetallics in AlSi Alloys Investigated with X-Ray Tomography


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Elementary Mn has a great importance as neutralizer of Fe intermetallics like β-Al5FeSi, which have detrimental effect on mechanical characteristics of AlSi alloys. Presence of Mn in AlSi alloys causes the formation of other intermetallic phases. To understand the effect of solidification conditions and fluid flow on the microstructure of AlSi-based alloys and the addition of Mn leading to Mn-based intermetallics, Al-5 wt pct Si 0.2/0.4/1.0 wt pct Mn alloys have been directionally solidified under defined thermal (gradient 3 K/mm, solidification velocity 0.02-0.12 mm/s) and fluid flow (rotating magnetic field 6 mT) conditions. The primary Al-phase and Mn-based intermetallic phases were studied using 3D X-ray tomography. The spatial morphology of primary phase and intermetallics were characterized with respect to different fluid flow and solidification conditions. The tomography has showed the 3D complicated structure of Mn phases developed.



Materials Science Forum (Volumes 790-791)

Edited by:

A. Roósz and K. Tomolya




P. Mikolajczak and L. Ratke, "Three Dimensional Morphology of Mn Rich Intermetallics in AlSi Alloys Investigated with X-Ray Tomography", Materials Science Forum, Vols. 790-791, pp. 335-340, 2014

Online since:

May 2014




* - Corresponding Author

[1] L.A. Narayanan, F.H. Samuel, J.E. Gruzleski, Crystallization Behavior of Iron-Containing Intermetallic Compounds in 319 Aluminum Alloy. Metall. Mater. Trans. A 25 (1994) 1761.


[2] S. Shivkumar, S. Ricci, C. Keller, Effect of Solution Treatment Parameters on Tensile Properties of Cast Aluminum Alloys. J. Heat Treat. 8 (1990) 63.


[3] G. Gustafsson, T. Thorvaldsson, G.L. Dunlop, The Influence of Fe and Cr on the Microstructure of Cast Al-Si-Mg Alloys. Metall. Trans. 17A (1986) 45.


[4] S. Steinbach, L. Ratke, Fluid Flow Effects on Intermetallic Phases in Al-cast Alloys. Trans. Indian Met., April-June 2007, vol. 60, Nos. 2-3, 137-141.

[5] S. Steinbach, et al., The Influence of Fluid Flow on Intermetallic Phases in Al-cast Alloys. Materials Science Forum 2006, vols. 519-521, 1795-1800.


[6] J. Alkemper, et al., Directional solidification in an aerogel furnace with high resolution optical temperature measurements. J. Cryst. Growth, 1998, vol. 191, p.252–60.


[7] S. Steinbach, Einfluss von Strömungen auf die Entwicklung des Mikrogefüges bei der gerichteten Erstarrung von Al-Si und Al-Si-Mg Legierungen. Ph.D. Thesis, RWTH, Aachen, (2005).

[8] M. Hainke, Computation of Convection and Alloy Solidification with the Software Package CrysVUn Ph.D. Thesis, Technical Faculty Erlangen-Nuremberg, Germany, (2004).

[9] S. Ebzeeva, L. Froyen, Symbiotic univariant eutectic growth in an ternary Al-alloy. Proceedings of the 5th Decennial Conference on Solidification Processing, Sheffield, UK, (2007).