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In this work (CoCrNi) 100− x   Nb   x    ( x  = 0–23.08 at.%) medium-entropy alloys were designed to investigate the solidification process and principle. The solid solubility of Nb in CoCrNi equiatomic MEA was discovered to be less than 0.46 at.%, and a fully eutectic structure was obtained at Co 28.9 Cr 28.9 Ni 28.9 Nb 13.3  alloy. Fcc and Laves phases are the main component phases in the (CoCrNi) 100− x   Nb   x    alloys. With the increasing Nb content, the volume fraction of fcc decreased, accompanied by the increment of Laves phase. Based on CALPHAD and experimental results, the top-left corner of the (CoCrNi)Nb pseudo binary phase diagram was achieved. Hypoeutectic (CoCrNi) 100− x   Nb   x    ( x  &lt; 13.3 at.%) alloys undergo the following solidification process: at first, primary dendrites with fcc structure nucleate and grow in the melt, then, eutectic reaction occurs and a mixture of Laves and fcc eutectic structure is obtained. Conversely, for hypereutectic (CoCrNi) 100− x   Nb   x    ( x  &gt; 13.3 at.%) alloys, the primary dendrite of Laves phase form, followed by the eutectic reaction of L → fcc + Laves.

Microstructural evolution and solidification behavior of (CoCrNi) 100− x Nb x medium-entropy-alloys