Aluminum Matrix Texture and Particle Characterization in Al-Al3Ti FGMs Produced by a Centrifugal Solid-Particle Method
The centrifugal solid-particle method has proved to be effective in producing functionally graded materials (FGMs). In this study, Al-Al3Ti FGMs, were produced by this centrifugal method, from an Al-5 wt % Ti master alloy. Applied centrifugal forces were 30, 60 and 120G (units of gravity). Samples from the outer surface of each specimen were cut and aluminum matrix texture analyzed by Schulz reflection method. Analysis of the resulting pole figures indicates a preferred orientation along the (200) plane for the aluminum matrix crystals. Furthermore, increasing the applied centrifugal force enhances the orientation effect. Al3Ti platelet orientation and area fraction at the samples’ outer surface along three observation planes were also measured. The Al3Ti platelets in the outer region are orientated perpendicular to the centrifugal force direction along two of the observed planes, also an increase in centrifugal force leads to an increase in orientation in those two planes. The intermetallic particle volume fraction also increases with higher applied centrifugal force, although not significantly. A correlation appears to exist between particle orientation and the preferred orientation of the matrix.
C. Esling, M. Humbert, R.A. Schwarzer and F. Wagner
P.D. Sequeira et al., "Aluminum Matrix Texture and Particle Characterization in Al-Al3Ti FGMs Produced by a Centrifugal Solid-Particle Method ", Solid State Phenomena, Vol. 105, pp. 415-420, 2005