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In this study, we investigate the influence of dislocation strengthening in the metastable parent phase on the deformation-induced martensitic transformation behavior of a face-centered cubic (fcc) Co 20 Cr 20 Fe 34 Mn 20 Ni 6  high-entropy alloy. Annealed and hot-swaged specimens were prepared. In-situ neutron diffraction experiments captured an accelerated transformation kinetics in the hot-swaged specimen due to accumulated dislocations. The phase-specific macrostress development showed that the hexagonal close-packed-martensite predominantly accommodated the macroscopic plastic deformation of the annealed counterpart. Conversely, the matrix dislocation strengthening promoted cooperative plasticity of the-matrix and the-martensitic phase, thus enhancing yield stress while preserving ductility.

Effect of matrix dislocation strengthening on deformation-induced martensitic transformation behavior of metastable high-entropy alloys