A Formation Map of Iron-Containing Intermetallic Phases in Recycled Cast Aluminum Alloys
- 98 Downloads
The cooling rate-dependent modification effect of Mn on the formation of Fe-containing intermetallic phases during solidification of Al-Si-Mg secondary cast aluminum alloys [containing 0.5 to 1 pct Fe (All compositions are in wt pct unless otherwise stated.)] was investigated by CALculation of PHAse Diagrams (CALPHAD) modeling and solidification experiments. The critical Mn concentration required to prevent the formation of detrimental β-Al5FeSi was found to be dependent on both the alloy composition (particularly the Fe/Mn ratio) and the cooling rate. A map of Fe/Mn ratio vs cooling rate was created, to summarize the metallurgical conditions of Fe-rich intermetallic phase formation. By understanding such formation conditions, the microstructure of aluminum castings can be controlled to create low-cost secondary alloys with high Fe content.
The authors would like to acknowledge the National Science Foundation for supporting this work (Award CMMI-1432688). Dr. Yeou-Li Chu and Mr. Patrick Cheng of Ryobi Die Casting are also acknowledged for helpful discussions.
- 2.J.G. Kaufman and E.L. Rooy: Aluminium Alloy Castings: Properties, Processes, and Applications, ASM International, Cleveland 2004.Google Scholar
- 7.A. Couture: AFS Int. Cast Met. J., 1981, vol. 6, pp. 9–17.Google Scholar
- 8.P.N. Crepeau: Trans. Am. Foundrymen’s Soc., 1995, vol. 103, pp. 361–6.Google Scholar
- 17.Y. Awano and Y. Shimizu: AFS Trans., 1990, vol. 98, pp. 889–95.Google Scholar