Abstract
The Ti-25Ta alloy was fabricated by LPBF using mechanically mixed powders. It was found that the relative density, phase composition, and surface roughness were quite different with different LPBF preparation parameters. The Ti-25Ta alloy samples have a high relative density (>99.9%) with better surface roughness at faster scan speed, and thereby lower laser energy density. However, the amount of unmelted Ta particles increased at a lower energy density. In addition, the energy input of the LPBF process had a great influence on the phase formation of Ti-25Ta due to element composition differences. The α' phase was mainly dominated in Ti-25Ta samples under lower laser energy density while changing to the α" phase gradually with the increase of laser energy density. The SEM image and XRD analysis were applied to show the characteristics. The micro-hardness of Ti-25Ta samples under various LPBF parameters was tested for proving the difference in the phase composition.
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