Fabrication of MgAl2O4 Reinforced Aluminum Matrix Gradient Composites under High Frequency Magnetic Field


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Two kinds of gradient composites, whose compositions were Al-20%Mg2Si-5%Si (sample-1) and Al-14.9%Mg2Si-10.3%Si-11.8% MgAl2O4 (sample-2), were fabricated based on the electromagnetic separation under the high frequency magnetic field. The microcosmic structures of two composites were analyzed and the effect of the addition of SiO2 on the microcosmic structure and the mechanical property were discussed. It is found that the particles MgAl2O4 accumulated in periphery of specimen of sample-2, which come from the diffusion reaction between SiO2 and aluminum and magnesium in the melt and was proved by the result of X-ray analysis. Besides the MgAl2O4, the primary phases of Mg2Si, Si also emerged in periphery of specimens. At last, the hardness was given along the radial direction. The result shows that the hardness of the two materials exhibit graded distribution in radial direction and the hardness of sample-2 is higher than that of sample-1 due to the formation of MgAl2O4 particles. Both the two materials meet the requirements of gradient composite material whose outer area is in high intensity and center area is in flexile.



Advanced Materials Research (Volumes 311-313)

Edited by:

Zhongning Guo






Z. Q. Cao et al., "Fabrication of MgAl2O4 Reinforced Aluminum Matrix Gradient Composites under High Frequency Magnetic Field", Advanced Materials Research, Vols. 311-313, pp. 48-53, 2011

Online since:

August 2011




[1] Chen Dongfeng, Cao Zhiqiang, Yang Miao. Produce surface layer reinforced in-situ graded composite under high frequency magnetic field. Foundry, 2006, 55 (8):821-824.

[2] Mao Weimen, Li Shusuo, Zhao Aimin, et al. Effect of electromagnetic stirring on the distribution of primary silicon in hypereutectic Al-Si alloys, Acta Metallurgica Sinica, 2001, 37 (7): 781-784.

[3] Q.T. Guo, T.J. Li, Tong-Min Wang, et al. Effect of turbulent flow on electromagnetic elimination with high frequency magnetic field. Trans. Nonferrous Met. Soc. China, 16(2006): 1141-1147.

DOI: 10.1016/s1003-6326(06)60391-9

[4] Cao Zhiqiang, Zhang Liping, Jin Junze, et al. Formation of a separated eutectic in Al-Si eutectic alloy. J Mater Sci, 1992, 27: 4663-4666.

DOI: 10.1007/bf01166003

[5] Jin Junze, Cao Zhiqiang. Structures and properties of surface composite pipe of Al-Ni alloy made by electromagnetic processing. Acta Metallurgica Sinica 1995, 31(8):B374-B378.

[6] Li Ke, Wang Jun, Shu Da. In-situ Al/Mg2Si functional graded materials (FGMs) prepared by electromagnetic separation. Journal of Shanghai Jiaotong University 2004, 39(9):1433-1437.

[7] Li Ke, Zhou Xin, Hu Shifei, et al, Analysis on effective imposing time of high frequency magnetic field in the process of fabricating in-situ graded composite. Journal of Nanchang University(Engineering & Technology) , 2006, 28(1):31-34.

[8] Li Ke, Wang Jun, Zhou Ming. Separation of inclusions from aluminum melt using alternating electromagnetic field. The Chinese Journal of Nonferrous Metals, 2002, 12(3): 521-524.

[9] Li Chifeng, Wang Jun, Shu da, et al. Temperature selection in melt for preparing in-situ graded composites with high frequency magnetic field. The Chinese Journal of Nonferrous Metals. 2004, 14(6):973-978.

[10] Chen Dongfeng, Cao Zhiqiang, Zhang Ting, et al. Hypereutectic Al-5%Fe in situ surface layer composite produced by electromagnetic separation, Journal of Functional Materials, 2007. 4, 38(4), 529-31, 539.

[11] Wei Yaowu, Li Nan, Liu Chuntao. Effect of Al-Mg alloy on the composition of Al2O3-SiC-Al composite, Journal of Wuhan University of Science and Technology, 2008, 31(3): 277-279.

[12] Zhang Shoukui, Wang Danhong, Zhao Hong. The reaction between molten aluminum and silica glass. Materials for Mechanical Engineering, 2001, 25(1):28-31.

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