Effect of chemical short-range order on the dislocation behavior of a multi-principal element alloy single crystal under shock loading

The CrCoNi single crystal, as a prototypical multi-principal element alloy (MPEA), with different degrees of chemical short-range order (CSRO) was employed to probe the effect of CSRO on the dislocation behavior of the MPEA under shock loading. As shock loading is along the [111] of single crystal, partial dislocations and corresponding stacking faults (SFs) are responsible for the microstructural response. As the marked increase of CSRO, the local misorientation and geometrically necessary dislocations in the deformed microstructure decreased slightly. By analyzing the strain field of SFs at the atomic scale, we further quantitatively determined the SF width. The average width of the SFs does not show substantial difference in the CrCoNi with different degree of CSRO considering the standard deviation. Our findings demonstrate that deformation behavior is negligibly dependent on CSRO in MPEAs under extreme loading conditions.