Influences of Acting Parameters of Electric Pulse Modification on the Al-22%Si-1.5%Cu Alloy

Abstract:

Hypereutectic Al-Si alloy are desirable and promising for many structural applications. The influences of electric pulse parameters on Al-22%Si-1.5%Cu alloy by using OM (optical microscope) analysis along with wear test had been investigated. This work focused on studying the comparison of its solidification structure and wear resistance property with and without electric pulse treatment, respectively. The results indicated that EPM (electric pulse modification) treatment with different voltage parameters along with the frequency parameters both had the remarkable effects on micro-structure, and the grain size of alloy was refined gradually with the increase of pulse voltage or frequency. The wear resistance property of the alloy was enhanced by electric pulse treatment. It was observed from DSC cooling curve that the precipitation peak point of primary silicon was delayed by electric pulse modification comparing to the original sample without electric pulse treatment, which was analyzed to play a critical key in the alloy grain refinement.

• Periodical: Advanced Materials Research (Volumes 299-300)
• Pages: 233-237
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.299-300.233
• Online since: July 2011
• Authors: Li Jia He, Jian Zhong Wang, Jin Gang Qi, Hui Ling Du, Xing Jiang Liu, Bing Wang
• Keywords: Al-Si Alloy, Electric Pulse Modification (EPM), Microstructure

References

[1] Y. P. Telang.: AFS Trans Vol. 71(1963), p.232.

[2] Dixon C F, Skelly H M. : Inter J. Powder Metall Vol. 1 (1965), p.28.

[3] Song xigui, Bian Xiufang. : Journal of University of Science and Technology Beijings Vol. 11 (2004), p.81.

[4] Fredriksson H, Hillert M, Lange N. : Journal of the institute of metals Vol. 101(1973), p.285.

[5] Geng Haoran, Ma Jiaji, Bian Xiufang.: Trans. Nonferrous Met. Soc. China Vol. 71(1997), p.137.

[6] Bian Xiufang, Wang Weimin. : Material Letters Vol. 44 (2000), p.54.

[7] Wang Jianzhong, Qi Jingang. : Journal of Iron and Steel Research International Vol. 14(2007), p.75.

[8] Qi Jingang, Wang Jianzhong : Journal of University Science and Technology Beijing, Vol. 12 (2005), p.527.

[9] He Lijia, Wang Jianzhong, Qi Jingang., et al. : China Foundry. Vol. 2 (2010), p.153.

[10] He Lijia, Wang Jianzhong, Qi Jingang. : Advanced materials research Vol. 26(2007), p.555.

[11] He Lijia, Wang JianZhong, Qi Jingang, et al. : Transactions of Materials and Heat Treatment. Vol. 28 (2007), p.102 (in Chinese).

[12] Wang JianZhong. : Dissertation of doctoral degree. Beijing: University of Science and Technology Beijing(1998). (in Chinese).

[13] Szekely J. Fluid flow phenomena in metals processing. (New York: Academic　Press Ltd., 1979).

[14] Radjai A, Miwa K. : Metall. Mater. Trans.A. Vol. 33 (2002), p.3025.

[15] Qin Rongshan.: Int. J. Non-Equilib. Proc. Vol. 11 (1998), p.77.