Analysis on Microstructure of AlSi7Cu5 Alloy by Slope Near-Liquidus Method

Abstract:

SSM(Semi-solid metal) forming has been developed to become a novel technology in the 21st century for the formation of near net shape components, competing with conventional casting and forging technologies. In this paper, the casting microstructure and its change during remelting of AlSi7Cu5 alloy casting by slope near-liquidus method were researched. Experiments show that it has a significant impact on microstructure by cooling method, the thermal conductivity of the casting mold and casting method. The microstructure of AlSi7Cu5 alloy obtained by slope near-liquidus method at 600°C is uniform and small equiaxed Its average grain diameter is about 55.2um, and its average grain size roundness is about 2.13. The reheated microstructure which can be applied in thixo-forming preferable will be obtained by keeping constant temperature 25min at 580°C.

• Periodical: Key Engineering Materials (Volumes 419-420)
• Pages: 517-520
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.419-420.517
• Online since: October 2009
• Authors: Shi-Kun Xie, Xiao Qiu Zheng, Rong Xi Yi, Xiao Liang Pan, Xiu Yan Guo
• Keywords: AlSi7Cu5 Alloy, Near-Liquidus, Reheating, Semi-Solid

References

[1] Flemings MC. Metal Trans., Vol. 22A (1991), p.957.

[2] J. Wannasin, R. Canyook, R. Burapa. Scripta Materialia, Vol. 59(2008), p.1091.

[3] Yalin Lu, Miaoquan Li, Weichao Huang. Materials characterization, Vol. 54(2005), p.423.

[4] Kang CG, Choi JS, Kim KH. J. Mater Process Technol, Vol. 88(1999), p.159.