In this study, an AlMg8Si9Cu10Zn10 (in wt%) alloy is fabricated with a high volume fraction of coarse secondary phases, which is higher fraction than in the conventional piston alloys. Ingots are cast in a permanent mold after an ultrasonic melt treatment for 60 s at the temperature range of 750–700 °C. Microstructure of AlMgSiCuZn alloy consists of Si, Zn, Mg2Si, Q-Al5Cu2Mg8Si6, and θ-Al2Cu phases. By the heat-treatment at 440 °C, Q-phase at the vicinity of blocky Mg2Si phase grows and the roundness of the second phases increases with respect to the heat-treating time. Compared with the as-cast specimen, room-temperature ultimate compressive strength of the heat-treated specimens increases. However, maximum compressive stress at 350 °C is slightly decreased by heat treatment. The formation of fine clusters increases the ultimate compressive strength, while the spheroidization of bulky secondary phases during heat treatment deteriorates the ultimate compressive strengths.
CITATION STYLE
Euh, K., Jung, J. G., Baek, E. J., Lee, J. M., & Kim, H. W. (2017). Effect of Heat-Treatment on Microstructure and Mechanical Properties of Sonicated Multicomponent AlMgSiCuZn Alloy. In Minerals, Metals and Materials Series (Vol. 0, pp. 379–383). Springer International Publishing. https://doi.org/10.1007/978-3-319-51541-0_47
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