This paper reports on the variation of particle size, particle shape and volume fraction distributions in Al-AI^Ni functionally graded materials (FGMs) fabricated by a centrifugal in-situ method. Eight specimens of Al-AI3N1 FGM were systematically selected for the experimental analysis. The microstructures of AI 3 Ni primary crystal particles were observed and then gradients of volume fraction of AI^Ni particles towards centrifugal force direction were measured. A detailed evaluation of particle size was done considering the area-equivalent diameter from cross-sectional area of each AI^Ni particle. Moreover, particle shape distributions were also conducted using functions concerning with both fractal dimension and circularity of particles. It is revealed that both particle size and particle shape of AI^Ni had graded distributions as well as volume fraction distributions within the FGMs.Those results were explained considering the effect of applied G number, Ni content in Al-Ni master alloy, cooling rate and stirring of melt.
Magnesium based functionally graded material (FGM) was fabricated by a centrifugal method from ZK60A (Mg-5.5 mass%Zn-0.6 mass%Zr) alloy. The applied G numbers are 40, 80 and 120, where the G number is the centrifugal force in unit of gravity. The specimen shape was cylindrical with 18 mm in length. Microstructures of the fabricated FGM specimens were observed using SEM. Energy dispersive Xray analysis was performed to study the chemical compositional gradients within the fabricated FGM specimens. It was found that concentration of Zr in the specimens increases toward the centrifugal force direction, while no or quite small chemical compositional gradient of MgZn 2 appears. A hardness change along the centrifugal force direction was also found. The graded structures are caused by the difference in the formation mechanisms of compositional gradient during the centrifugal method between Zr and Zn.
Three kinds of magnesium based titanium particles-dispersed functionally graded materials FGMs were fabricated by a centrifugal solid-particle method. Materials were pure magnesium, AZ91D 9.
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