To tailor the chemical composition in directed energy deposition (DED), powder can be pre alloyed or elementally blended. Although in-situ alloying via elemental blending is less expensive and more flexible, it remains challenging to produce homogeneous alloys, e.g., in case of a Titanium-Tantalum alloy. This is due to their large density and melting point differences, eventually increasing the risk of vaporizing low melting elements, creating inhomogeneities by segregation or residual undissolved particles. Therefore, it is important to investigate the behavior of powder particles in the melt pool in order to understand how their dissolution can be improved. In the present study, in-situ high speed X-ray imaging of the DED process using blended titanium-tantalum powder was conducted. Thereby, 1 wt.% pure tantalum was added to a pre-alloyed Ti25Ta5Al (wt. %) powder. In the resulting radiographic images, the pure tantalum particles appear darker due to their higher absorptivity. This is exploited to track the movement of these particles, allowing to investigate melt pool flow and particle behavior. In the analysis, two different datasets processed with different laser powers are compared.