Effect of Casting Condition on Density and Hardness Gradients of Al-Al2Cu Alloy FGM Fabricated by Centrifugal In Situ Method


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Functionally graded material (FGM) is a combined material that has a component gradient from one material at one surface to another material at the opposite surface.  As one of the fabrication processes of FGM, centrifugal in-situ method has been proposed. Centrifugal in-situ method is a casting that centrifugal force is applied during solidification to both the primary crystal and the matrix. In a previous study, the density and hardness gradients of Al-3mass%Cu FGM ring fabricated by centrifugal in-situ method have been investigated. According to the study, Cu concentration within the FGM ring monolithically increases towards the ring's inner position, and its density also increases toward inner region. This is because the density of the primary -Al crystal is larger than that of the molten Al-Cu alloy in the early stage of solidification. Based on this solidification process, it is considered that the casting condition and the initial Cu concentration of Al-Cu master alloy affect on the density and hardness gradients in the Al-Cu FGM ring. In this study, effects of the casting condition on the density and hardness gradients of Al-Al2Cu FGM rings fabricated by the centrifugal in-situ method were investigated. It was found that density gradient of the Al-Al2Cu FGM rings increases with increasing Cu concentration of Al-Cu master alloys. Also, processing temperature for Al-Cu master alloy can control density gradient of Al-Al2Cu FGM rings. These phenomena were explained by variation of the densities of primary -Al and the molten Al matrix during the solidification.



Materials Science Forum (Volumes 631-632)

Edited by:

Akira Kawasaki, Akinaga Kumakawa and Masayuki Niino






K. Tabushi et al., "Effect of Casting Condition on Density and Hardness Gradients of Al-Al2Cu Alloy FGM Fabricated by Centrifugal In Situ Method", Materials Science Forum, Vols. 631-632, pp. 449-454, 2010

Online since:

October 2009




[1] FGM Forum of Japan: Functionally Gradient Materials, (Kogyo Chosakai Publishing, Tokyo 1993). (in Japanese).

[2] Y. Watanabe, N, Yamanaka and Y. Fukui: Composites Part A Vol. 29A (1998), p.595.

[3] Y. Watanabe, I. S. Kim and Y. Fukui: Metals and Materials International Vol. 11 (2005), p.391.

[4] Y. Watanabe and S. Oike: Acta Mater. Vol. 53 (2005), p.1631.

[5] Y. Watanabe, H. Sato, T. Ogawa and I. S. Kim: Mater. Trans. Vol. 48 (2007), p.2945.

[6] T. B. Massalski: Binary Alloy Phase Diagrams, (ASM International, Materials Park 1988).

[7] D. A. Porter and K. E. Easterling: Phase Transformations in Metals and Alloys, (Van Nostrand Reinhold Company, New York 1981), p.209.

[8] L. Vegard: Zeitschrift fur Physik Vol. 5 (1921), p.17.

[9] Japan Society of Thermophysical Properties: Thermophysical Properties Handbook, (Yokendo, Tokyo 1990), p.22.

[10] K. Bornemann and F. Sauerwald: Z. Metallk. Vol. 14 (1922), p.145.

[11] H. C. Brinkman: J. Chem. Phys. Vol. 20 (1952), p.571.

[12] T. Murakami, H. Sato and Y. Watanabe: Functionally Graded Materials Vol. 19 (2005), p.1.

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