摘要
In the present study, a Co1.5CrFeNi1.5Ti0.5 high-entropy alloy has been investigated for its high-temperature microstructural stability. This material is shown to possess mainly a face-centered cubic (FCC) structure; the eta phase is present at the interdendritic region in the as-cast condition, and it is stable between 1073 K and 1273 K (800 degrees C and 1000 degrees C); gamma' particles are found throughout the microstructures below 1073 K (800 degrees C). Segregation analysis has been conducted on a single crystal sample fabricated by a directional solidification process with a single crystal seed. Results show that Co, Cr, and Fe partition toward the dendritic region, while Ni and Ti partition toward the interdendritic areas. Scheil analysis indicates that the solid-liquid partitioning ratio of each element is very similar to those in typical single crystal superalloys. (C) The Minerals, Metals & Materials Society and ASM International 2013