Natural Aging of AlMg5Si2Mn Casting Alloy

The as-cast and heat treated structure of permanent mould and high pressure die castings of the AlMg5Si2Mn alloy has been investigated by differential scanning calorimetry, microhardness measurements, transmission electron microscopy and energy dispersive X-ray analysis. Curved plate-like precipitates were detected for both alloys inside the -Al grains. Examination of these precipitates revealed a number of features, such as: 1) the composition of the precipitates is very close to the stoichiometric Mg2Si compound; 2) precipitates are aligned along dislocations; 3) the precipitate density is much higher for the high pressure die castings where the -Al matrix contains more dislocations than in permanent mould castings; 4) precipitates lie inside the -Al grains where they are randomly distributed. The Mg2Si lamellas were not observed between precipitates; 5) homogenization of the alloy results in complete dissolution of the precipitates and during artificial aging new needle-shaped precipitates are formed.

Publication year: 
2014
Issue: 
1
УДК: 
669.715 72178274–143/–126.4::669.017.16
Табл. 3. 10
References: 

1. M.C. Wuth et al., “Production of steering wheel frames with an AlMg5Si2Mn alloy”, Casting Plant Tech. Int., vol. 16, pp. 12—24, 2000.
2. H. Sternau et al., “Magsimal-59 an AlMgMnSi-type squeeze-casting alloy designed for temper F”, in Light Metals — Warrendale, 1996, pp. 933—937.
3. S. Otarwanna et al., “Microstructure Formation in AlSi4MgMn and AlMg5Si2Mn High—Pressure Die Castings”, Met. Mater. Trans. A, 40A, pp. 1645—1659, 2009.
4. T. Petkov et. al., “Erweiterung des Eigenschaftspotentials der Legierung Al Mg5Si2Mn durch eine gezielte Warmebehandlung”, BHM Berg- und Huttenmannische Monatshefte, vol. 158, is. 3, pp. 1—9, 2013.
5. G.K. Sigworth et al., “High Strength, Natural Aging Aluminum Casting Alloys For Automotive Applications”, in 40th Annu. Conf. of metallurgists and electrometallurgy, Light metals Symposium, Toronto, August 26—29, 2001, pp. 349—358.
6. G. Wang et al., “Analyzing As-Cast Age Hardening of 356 Cast Alloy”, J. Mat. Eng. Performance, vol. 20, pp. 399—404, 2011.
7. Q.G. Wang and C.J. Davidson, “Solidification and precipitation behaviour of Al—Si—Mg casting alloys”, J. Mat. Sci., vol. 36, pp. 739—750, 2001.
8. O.M. Barabash et al., “Experimental analysis and Thermodynamic calculation of the structural Regularities in the fusion diagram of the system of alloys Al—Mg—Si”, J. Phase Equilibria, vol. 22, pp. 5—11, 2001.
9. L.F. Mnodolfo, Aluminum alloys: structure and properties. London; Boston: Butterworths, 1976, p. 678.
10. C. Ravi and C. Wolverton, “First—principles study of crystal structure and stabilityof Al—Mg—Si—(Cu) precipitates”, Acta Materialia, vol. 52, pp. 4213—4227, 2004.

References [transliteration]: 

1. M.C. Wuth et al., “Production of steering wheel frames with an AlMg5Si2Mn alloy”, Casting Plant Tech. Int., vol. 16, pp. 12–24, 2000.
2. H. Sternau et al., “Magsimal-59 an AlMgMnSi-type squeeze-casting alloy designed for temper F”, in Light Metals – Warrendale, 1996, pp. 933–937.
3. S. Otarwanna et al., “Microstructure Formation in AlSi4MgMn and AlMg5Si2Mn High–Pressure Die Castings”, Met. Mater. Trans. A, 40A, pp. 1645–1659, 2009.
4. T. Petkov et. al., “Erweiterung des Eigenschaftspotentials der Legierung Al Mg5Si2Mn durch eine gezielte Warmebehandlung”, BHM Berg- und Hüttenmännische Monatshefte, vol. 158, is. 3, pp. 1–9, 2013.
5. G.K. Sigworth et al., “High Strength, Natural Aging Aluminum Casting Alloys For Automotive Applications”, in 40th Annu. Conf. of metallurgists and electrometallurgy, Light metals Symposium, Toronto, August 26–29, 2001, pp. 349–358.
6. G. Wang et al., “Analyzing As-Cast Age Hardening of 356 Cast Alloy”, J. Mat. Eng. Performance, vol. 20, pp. 399–404, 2011.
7. Q.G. Wang and C.J. Davidson, “Solidification and precipitation behaviour of Al–Si–Mg casting alloys”, J. Mat. Sci., vol. 36, pp. 739–750, 2001.
8. O.M. Barabash et al., “Experimental analysis and Thermodynamic calculation of the structural Regularities in the fusion diagram of the system of alloys Al – Mg – Si”, J. Phase Equilibria, vol. 22, pp. 5–11, 2001.
9. L.F. Mnodolfo, Aluminum alloys: structure and properties. London; Boston: Butterworths, 1976, p. 678.
10. C. Ravi and C. Wolverton, “First–principles study of crystal structure and stabilityof Al–Mg–Si–(Cu) precipitates”, Acta Materialia, vol. 52, pp. 4213–4227, 2004.

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