Abstract
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 MgZn2 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.
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