| Abstract Scope |
Since autogenous damage-healing enables to increase in the material life-cycle, self-healing metals have recently attracted significant attention. Especially, Self-healing is widely studied for high-temperature applications since most of it is obtained via diffusion of specific “healing agents.” In this study, we assessed the Y-addition effect of self-healing behavior in Co-based superalloys. The healing agent, Y, was carefully selected considering segregation tendency, strengthening effect, electronegativity, atomic size mismatch, etc., with Co. To assess the self-healing property of the Y-added superalloys, we conducted the in-situ tensile test at elevated temperatures in SEM. Firstly, we quantified the damage by measuring the KAM at different strains. At the same time, we analyzed the spontaneous segregation of Y to the damaged part, and the damage relief depending on Y segregation. Moreover, we confirmed that nano/micro-cracks could be closed by precipitating. This work is anticipated to provide a guideline for self-healing property development for high-temperature applications. |