Research on the dislocation differences of CoCrFeMnNi with different local chemical orders during room temperature tensile test

Abstract More and more evidences show that local chemical order (LCO) plays an important role on the properties of materials. In this work, we for the first time clarified the effect of LCO on the room-temperature tensile properties of CoCrFeMnNi using hybrid molecular dynamics and Monte Carlo simulations. The results showed that three different chemical orderings (Co-Fe, Mn-Ni and Cr-rich ordering) were observed in the microstructure after MC cycles, which was consistent with the experimental results. Amongst them, the dislocations preferred to form in the Cr-rich region which has different lattice constant from other phases. The distribution and size of the Cr-rich region affected the density and distribution of the dislocations. These dislocation characteristics determined the mechanical properties of CoCrFeMnNi, so the mechanical properties can be controlled by adjusting the LCO.