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Color Metallography and Electron Microscopy Techniques Applied to the Characterization of 413.0 Aluminum Alloys

Published online by Cambridge University Press:  24 May 2013

George Vander Voort ,
Juan Asensio-Lozano  and
Beatriz Suárez-Peña
George Vander Voort
Affiliation:
Consultant, Struers Inc., 2887 N. Southern Hills Drive, Wadsworth, IL 60083-9293, USA
Juan Asensio-Lozano*
Affiliation:
Materials Science and Metallurgical Engineering Department, The School of Mines, The University of Oviedo, Oviedo, Asturias 33004, Spain
Beatriz Suárez-Peña
Affiliation:
Materials Science and Metallurgical Engineering Department, The University of Oviedo, Gijón Polytechnic School of Engineering, Viesques Campus, Gijón, Asturias 33203, Spain
*
*Corresponding author. E-mail: jasensio@uniovi.es
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Abstract

The influence on alloy 413.0 of the refinement and modification of its microstructure was analyzed by means of several microscopy techniques, as well as the effect of the application of high pressure during solidification. For each treatment and solidification pressure condition employed, the most suitable microscopy techniques for identifying and characterizing the phases present were investigated. Color metallography and electron microscopy techniques were applied to the qualitative microstructural analysis. Volume fraction and grain size of the primary α-Al were characterized by quantitative metallographic techniques. The results show that the effect caused by applying high pressure during solidification of the alloy is more pronounced than that caused by modification and refinement of the microstructure when it solidifies at atmospheric pressure. Furthermore, it has been shown that, for Al–Si alloy characterization, when aiming to characterize the primary α-Al phase, optical color metallography observed under crossed polarized light plus a sensitive tint filter is the most suitable technique. When the goal is to characterize the eutectic Si, the use of optical color metallography or electron microscopy is equally valid. The characterization of iron-rich intermetallic compounds should preferably be performed by means of backscattered electron imaging.

Keywords

optical color microscopyscanning electron microscopyquantitative metallographic characterizationcast aluminum alloysgrain refiningeutectic modificationhigh pressure die casting
Type
Materials Applications
Information
Microscopy and Microanalysis , Volume 19 , Issue 4 , August 2013 , pp. 1019 - 1026
Copyright
Copyright © Microscopy Society of America 2013 

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References

Abbaschian, R., Abbaschian, L. & Reed-Hill, R.E. (2009). Solidification of metals. In Physical Metallurgy Principles, Gowans, H. (Ed.), pp. 408–461. Stamford, CT: Cengage Learning.Google Scholar
Asensio-Lozano, J., Del Campo, J.J. & Suarez-Peña, B. (2005). Correlation between microstructure and mechanical properties of escalator steps made by high pressure die casting. Microsc Microanal 11(Suppl 2), 1716–1717.Google Scholar
Asensio-Lozano, J., Suarez-Peña, B. & Vander Voort, G.F. (2006). Microstructural optimization of chill cast Al-Si eutectic alloys. Microsc Microanal 12(Suppl 2), 1608–1609.CrossRefGoogle Scholar
Asensio-Lozano, J., Suarez-Peña, B. & Vander Voort, G.F. (2007). Interpretation of the mechanical quality index through the microstructure in hypoeutectic and eutectic treated Al-Si alloys. Microsc Microanal 13(Suppl 2), 110–111.Google Scholar
ASTM E1382–97 (2010). Standard Test Methods for Determining Average Grain Size Using Semiautomatic and Automatic Image Analysis. West Conshohocken, PA: ASTM International.Google Scholar
Chapon, J. & Szkliniarz, W. (2001). Quantitative metallography of two-phase titanium alloys. Mater Charact 46, 149–154.Google Scholar
Gruzleski, J.E. (2000a). Polyphase solidification. In Microstructure Development During Metalcasting, American Foundrymen's Society Inc. (Eds.), pp. 196–210. Des Plaines, IL: American Foundrymen's Society.Google Scholar
Gruzleski, J.E. (2000b). Morphological modification in industrial alloys. In Microstructure Development During Metalcasting. American Foundrymen's Society Inc. (Eds.), pp. 232–233. Des Plaines, IL: American Foundrymen's Society.Google Scholar
Gruzleski, J.E. & Closset, B.M. (1999). Aluminum-silicon foundry alloys. In The Treatment of Liquid Aluminum-Silicon Alloys. American Foundrymen's Society Inc. (Eds.), pp. 13–24. Des Plaines, IL: American Foundrymen's Society.Google Scholar
Gündüza, M., Kayab, H., Çadirli, E. & Özmenc, A. (2004). Interflake spacing and undercoolings in Al–Si irregular eutectic alloy. Mater Sci Eng A 369, 215–229.Google Scholar
Hengcheng, L., Yu, S. & Guoxiong, S. (2002). Correlation between mechanical properties and amount of dendritic α-phase in as-cast near eutectic Al-11.6% Si alloys modified with strontium. Mater Sci Eng A 335, 62–66.Google Scholar
Higginson, R.L. & Sellars, C.M. (2003). Worked Examples in Quantitative Metallography. London: Maney Publishing.Google Scholar
Liao, H.C. & Sun, G.X. (2003). Mutual poisoning effect between Sr and B in Al-Si casting alloys. Scr Mater 48, 1035–1039.Google Scholar
Lim, Y.P. (2009). Evaluation of Al-5Ti-1B and Al-10Sr in LM6 sand castings. J Achievements Mater Manufact Eng 34, 71–78.Google Scholar
Liu, L., Samuel, A.M., Samuel, F.H., Doty, H.W. & Valtierra, S. (2004). Characteristics of α-dendritic and eutectic structures in Sr-treated Al-Si casting alloys. J Mater Sci 39, 215–224.Google Scholar
Massalsky, T.B. (1986). Binary Alloy Phase Diagrams. Metals Park, OH: American Society for Metals.Google Scholar
Muirhead, J., Cawley, J. & Strang, A. (2000). Quantitative aspects of grain size measurement. Mater Sci Tech-Lond 16, 1160–1166.Google Scholar
Murty, B.S., Kori, S.A. & Chakraborty, M. (2002). Grain refinement of aluminum and its alloys by heterogeneous nucleation and alloying. Int Mater Rev 47, 3–29.CrossRefGoogle Scholar
Narayan, L.A., Samuel, F.H. & Gruzleski, J.E. (1994). Crystallization behavior of iron-containing intermetallic compounds in 319 aluminum alloy. Metall Mater Trans A 25, 1761–1773.Google Scholar
Nogita, K. & Dahle, A.K. (2001). Eutectic solidification in hypoeutectic Al–Si alloys: Electron backscatter diffraction analysis. Mater Charact 46, 305–310.CrossRefGoogle Scholar
Nogita, K., Yasuda, H., Yoshida, K., Uesugi, K., Takeuchi, A., Suzuki, Y. & Dahle, A.K. (2006). Determination of strontium segregation in modified hypoeutectic Al–Si alloy by micro X-ray fluorescence analysis. Scripta Mater 55, 787–790.Google Scholar
Osorio, W.R., Spinelli, J.E., Ferreira, I.L. & Garcia, A. (2007). The roles of macrosegregation and dendritic array spacings on the electrochemical behavior of an Al–4.5 wt.% Cu alloy. Electrochim Acta 52, 3265–3273.CrossRefGoogle Scholar
Roebuck, B. (2000). Measurements of grain size distribution in engineering materials. Mater Sci Tech-Lond 16, 1167–1174.CrossRefGoogle Scholar
Shankar, S. & Apelian, D. (2002). Mechanism and preventive measures for die soldering during Al casting in a ferrous mold. J Oper Manage 54, 47–54.Google Scholar
Sritharan, T. & Li, H. (1997). Influence of titanium to boron ratio on the ability to grain refines aluminum-silicon alloys. J Mater Process Technol 63, 585–589.Google Scholar
Suarez-Peña, B., Asensio-Lozano, J. & Vander Voort, G.F. (2007). Metallographic research of the pressure effect on the final microstructure of eutectic Al-Si alloys. Microsc Microanal 13(Suppl 2), 1030–1031.Google Scholar
Tenekedjiev, N., Mulazimoglu, H., Closset, B. & Gruzleski, J.E. (1995). Microstructures and Thermal Analysis of Strontium-Treated Aluminum-Silicon Alloys. Des Plaines, IL: American Foundrymen's Society.Google Scholar
Vander Voort, G.F. (1981). Etching techniques for image analysis. In Microstructural Science, Petzow, G.R., Paris, R., Albrecht, E.D. & McCall, J.L. (Eds.), vol. 9, pp. 137–154. New York: Elsevier North-Holland.Google Scholar
Vander Voort, G.F. (1994). Precision and reproducibility of quantitative measurements. In Quantitative Microscopy and Image Analysis, Diaz, D.J. (Ed.), pp. 21–34. Materials Park, OH: ASM International.Google Scholar
Vander Voort, G.F. (1996). Image analysis. In Materials Characterization, Mills, K. (Ed.), vol. 10, pp. 309–322. Materials Park, OH: ASM International.Google Scholar
Vander Voort, G.F. (1999). Metallography: Principles and Practice. Materials Park, OH: ASM International.Google Scholar
Vander Voort, G.F. (2004a). Color metallography. In Metallography and Microstructures, ASM Handbook, Vander Voort, G.F. (Ed.), vol. 9, pp. 493–512. Materials Park, OH: ASM International.Google Scholar
Vander Voort, G.F. (2004b). Light microscopy. In Metallography and Microstructures, ASM Handbook, Vander Voort, G.F. (Ed.), vol. 9, pp. 332–354. Materials Park, OH: ASM International.Google Scholar
Vander Voort, G.F. & Asensio-Lozano, J. (2009). The Al-Si phase diagram. Micros Microanal 15(Suppl 2), 60–61.Google Scholar
Warmuzek, M. (2004). Metallographic techniques for aluminum and its alloys. In Metallography and Microstructures, ASM Handbook, Vander Voort, G.F. (Ed.), vol. 9, pp. 711–751. Materials Park, OH: ASM International.Google Scholar
Weck, E. & Leistner, E. (1986). Metallographic Instructions for Color Etching by Immersion, Part III: Non-Ferrous Metals, Cemented Carbides and Ferrous Metals, Nickel-Base and Cobalt-Base Alloys. Dusseldorf, Germany: Deutscher Verlag für Schweißtechnik.Google Scholar