Solidification and Liquation Cracking in Welds of High Entropy CoCrFeNiCux Alloys

High entropy CoCrFeNiCux alloys with a Cu molar ratio of x ≈ 0, 0.5, 1, 1.5 and 2 were arc welded. Solidification cracking occurred in the fusion zones 1 1.5. Cu-rich material was observed around cracks, increasing quantity content. Liquation partially melted zone next to zone, it propagated into as solidification cracking. A recently proposed index for susceptibility tried, i.e., |dT/d(fS)1/2| near (fS)1/2 = where T is temperature fS solid fraction. The higher 1.0 1.5, consistent observed.