Solid solutioning in equiatomic alloys: Limit set by topological instability.

Highlights: [•] A series of fcc structured equiatomic solid solutions were designed. [•] The solid solution limit in multi-component equiatomic alloys was explored. [•] Topological instability sets the solid solution limit. [•] Decomposition occurs when the lattice strain reaches a critical value of 0.018. [ABSTRACT FROM AUTHOR]