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Abstract
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The present study aims to investigate the influence of reinforcement filling strategy on particle distribution and mechanical
properties of ZA27/TiH2 composites fabricated through friction stir processing. For comparison, the base material and
processed material without reinforcement were considered as reference materials. In this work, the parameter which was
taken as a variable, was reinforcement filling strategy. The microstructures were analyzed using optical and scanning electron
microscopes. Microhardness, tensile, and wear tests were also performed. Microstructure analysis showed the particle
distribution in hole-filling methods is more uniform than groove-filling methods. Besides, among hole-filling methods, those
which contained more holes with smaller diameters exhibited more homogenous particle distribution and fewer defects.
Further characterization revealed that the mechanical properties of the linear pattern were higher than the zigzag pattern and
even the base material, so the failure occurred in the base material. However, the mechanical properties of other composites
such as hardness, strength, and elongation were found lower than reference materials due to the agglomeration of particles.
The wear test results showed that the wear resistance of the unreinforced FSP sample decreased as compared to base material
whereas improved by adding reinforcement particles into two linear rows of blind holes.
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