| Abstract Scope |
A new series of Fe–Mn–Co–Al–C and Fe–Mn–Co–Ni–Cu–Al–C alloys with tensile plasticity up to 10% and exceptionally high yield strength values reaching 1.5 GPa will be presented. These mechanical properties are achieved solely through standard technological processes, including homogenization, hot forging, cold rolling, and tempering/aging. This accomplishment is realized by leveraging the high-entropy/multiprinciple element approach, leading to the formation of a duplex-type FCC cF4 and BCC cI2 solid solution structure. The mechanical strengthening observed is a consequence of both strengthening with the BCC cI2 phase and deformation strengthening during the thermo-mechanical treatment applied. This approach can be extended to various other medium- and high- entropy-type alloys. The effects of small Cu addition on the resulting microstructure and oxidation heat resistance were also studied. BCC cI2 to FCC cF4 strain-induced, but thermally reversible, transformation was observed and studied in detail. |