Research on the Microstructure and Properties of Hypereutectic Al-Si Alloy for Semi-Solid Forming during Heat Treatment

Abstract:

The heat treatment process of a kind of hypereutectic aluminum silicon alloy which is suitable for semi-solid forming and the change of microstructure and performance during the process of heat treatment had been studied in this paper. In order to guide the heat treatment process, the phase diagram of the alloy had been calculated by the software of Thermo-Calc, and the theoretical solid and liquid line had been gotten. Twelve kinds of heat treatment process had been selected in this study. Finally the best process which the solution temperature is 495°C for 2h and aging temperature is 160°C for 8h had been gotten.

• Periodical: Advanced Materials Research (Volumes 887-888)
• Pages: 349-356
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.887-888.349
• Online since: February 2014
• Authors: Xiang Fan, Yi Tao Yang*
• Keywords: Aluminum Silicon Alloy, Heat Treatment, Mechanical Property, Microstructure Change

References

[1] Hernandez F R, Sokolowski J H. Comparison among chemical and electromagnetic stirring and vibration melt treatments for Al-Si hypereutectic alloys[J]. Journal of Alloys and Compounds, 2006, 426: 205-212.

DOI: 10.1016/j.jallcom.2006.09.039

[2] Zhang Shiling, Ren Songzan. Condensed aluminum manual[M]. Shanghai: Shanghai science and technology press, (2001).

[3] Xiong Yancai, Liu Bochao. Review and prospect of cast aluminum alloy[J]. Special casting and nonferrous alloys, 1998(4): 1-5.

[4] Li Rongde, Yu Haipeng. Quantitative metallographic analysis for morphology change of eutectic silicon in Al-Si-Cu-Mg hypoeutectic casting alloy during the solution heat treatment[J]. Foundry, 1997(6): 1-5.

[5] KASHYAP K.T. Casting and heat treatment variables of Al-7Si-Mg alloy[J]. Mater. Sci. Technol, 1993, 9(3): 189-203.

[6] Gui Manchang, Song Guangsheng. The feature of melt structure of hypereutectic Al-18Si alloy and the impact of phosphorous[J]. Acta Metallurgica Sinica, 1995, A31(4): 177-182.

[7] Li Runxia, Yu Hongjiang. Effect of heat treatment to microstructure and properties of hypereutectic Al-Si alloy[J]. Hot working technology, 2009, 38(14): 121-123.

[8] WARD P H, ATKINSON H V, ANDERSON P R G, et al. Semi-solid processing of novel MMCs based on hypereutectic aluminum alloys[J]. Acta Mater. ，1996, 44(5): 1717-1727.

DOI: 10.1016/1359-6454(95)00356-8

[9] Tian Rongzhang. Cast aluminum alloy[M]. Changsha: Central south university press, (2006).

[10] Huang Debing. Nonferrous metals handbook[M]. Beijing: Chemical industry press, (2005).

[11] Fan Xiang, Yang Yitao. Heat treatment of semi-solid forming hypereutectic Al-Si alloy[J]. Special casting and nonferrous alloys, 2013, 33(5): 416-420.