Effects of Particle Size on Fabrication of Al-TiO2 Functionally Graded Materials by Centrifugal Mixed-Powder Method

Hisashi Sato; Junya Maeda; Motoko Yamada; Yoshimi Watanabe

doi:10.4028/www.scientific.net/MSF.879.1691

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HomeMaterials Science ForumMaterials Science Forum Vol. 879Effects of Particle Size on Fabrication of Al-TiO2...

Effects of Particle Size on Fabrication of Al-TiO₂ Functionally Graded Materials by Centrifugal Mixed-Powder Method

Abstract:

As one of processing methods of functionally graded materials (FGMs), centrifugal mixed-powder method has been proposed. The centrifugal mixed-powder method is the casting process combined of centrifugal casting and powder metallurgy. This processing method has advantage that fine ceramics-particles, whose wettability with matrix melt is low, can be compounded into metallic material. However, effects of particle size on microstructure and mechanical properties of the FGMs fabricated by the centrifugal mixed-powder method are unclear. In this study, two kinds of Al-TiO₂ FGMs rings are fabricated by the centrifugal mixed-powder method. One contains TiO₂ particles having similar diameter with Al matrix particles (hereafter, small different-size (SD) TiO₂ particles), and the other one compounds TiO₂ particles with much smaller diameter than Al matrix particles (hereafter, large different-size (LD) TiO₂ particles). In case of the Al-TiO₂ FGMs ring containing SD-TiO₂ particles, the TiO₂ particles are homogeneously dispersed in Al matrix on outer surface of the ring. On the other hand, the TiO₂ particles in the Al-TiO₂ FGMs ring with LD-TiO₂ particles are distributed along grain boundary of Al matrix. Moreover, Vickers-hardness and wear resistance around outer surface of the Al-TiO₂ FGMs ring containing the SD-TiO₂ particles is higher than that of the Al-TiO₂ FGMs ring with LD-TiO₂ particles. Since Al particles in the mixed-powder with LD-TiO₂ particles are surrounded by the TiO₂ particles, the Al particles can be hardly melted by heat of molten Al at casting process. As a result, the Al-TiO₂ FGMs ring with LD-TiO₂ particles has low hardness and wear resistance. Therefore, it is found that TiO₂ particles having similar diameter with Al matrix particles are more suitable for fabrication of the Al-TiO₂ FGMs rings.

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Periodical:

Materials Science Forum (Volume 879)

Pages:

1691-1697

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.879.1691

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Online since:

November 2016

Authors:

Hisashi Sato*, Junya Maeda, Motoko Yamada, Yoshimi Watanabe

Keywords:

Aluminum Alloy, Casting, Composite, Functionally Graded Materials (FGMs), Particle Distribution

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