| Abstract Scope |
The formation of Kirkendall porosity, arising from imbalanced diffusivities, is exhibited in the Ni-Cr-Al-Ti. This study examines how chromium content influences vacancy flux and pore evolution in Ni-Ti, Ni-Al, Ni-Cr-Al, and Ni-Cr-Ti diffusion couples. Chromium levels in the Ni-based alloys were systematically varied (0, 10, and 20 wt.%) and paired with Ti- and Al- containing counterparts. Following high-temperature annealing, concentration profiles were obtained via Energy Dispersive Spectroscopy (EDS), and diffusion coefficients were calculated. The presence, morphology, and spatial distribution of Kirkendall porosity were analyzed qualitatively and quantitatively across the different systems. These findings are further contextualized by comparison with prior studies involving Ni-based substrates modified through Chemical Vapor Deposition (CVD). The results offer new insights into the role of compositional tuning in diffusion kinetics and Kirkendall pore formation in these systems. |