TiCp/ZA-12 composites have been fabricated by XDTM method and stirring-casting
techniques. The behavior of TiC particle in the solidification interface has been studied through
conventional and directional solidification techniques. The results demonstrate that under
conventional solidification conditions, the particles with lower content mainly distribute in eutectic
phases; while when at a larger content of TiC particles, they exist both in eutectic phases and in
primary phases. Under directional solidification, due to the repulsion of primary phases of alloy on
TiC particles, the particles congregate and form band structure, and extent of the congregation in
band structure relates to TiC particles content. With the increasing of TiC particles content, their
congregation in band structure decreases, and the band structure disappears when the content of TiC
particles exceeds 6%. The tests for mechanical properties reveal that the tensile strength and yield
strength increase with increasing fraction of TiC particles. When the fraction of TiC particles
increase up to 10%, the tensile strength and yield strength are 390MPa and 340MPa, respectively
and they increase by 11% and 17% than that of matrix respectively.
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