Abstract
The excellent corrosion resistance exhibited by CrFeNi multi-principal element alloys makes them highly desirable for the development of novel stainless alloys, but they exhibit a low strength. This work explores a simple processing route to enhance the strength by cold-rolling and annealing a CrFeNi alloy to introduce a partially recrystallized structure, refine its grain, and construct fine heterostructures. These changes increased the yield strength from 402 MPa to 1025 MPa while maintaining acceptable ductility. Dislocation strengthening, grain boundary strengthening, and hetero-deformation-induced strengthening were responsible for the strength enhancement. A smaller soft phase in the heterostructure enhanced the effectiveness of hetero-deformation-induced strengthening. The findings presented in this article offer additional strengthening methods for CrFeNi multi-principal element alloys.
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