Fig. 1. Crystal structure and deformation behavior of CrMnFeCoNi alloy at low temperatures.

(A) Selected diffraction patterns at room temperature and at 15 K during deformation, showing a clean single-phase fcc structure. (B) True stress-strain curves at room temperature, 140 K, and 15 K. The trend of temperature fluctuations (right-hand axis) due to serrations at 15 K is also superimposed. (C) Two serrations are shown with temperature (plotted in reverse scale for better comparison) to illustrate details of serrated deformation. (D) Plots of strain-hardening rate (SHR) at three temperatures. (E) Scanning electron microscopy image of the fractured sample at 15 K showing the 45° wedge.