In-situ neutron diffraction study of serration-involved ultra-cryogenic deformation behavior at 15 K

This work focused on the mechanical properties and serration-involved deformation behavior of advanced alloys at 15 K. Evolution of stacking faults and ε-martensite improve the mechanical performance of CoCrNi alloys, and significant strain-induced martensite transformation of DED-SS316L leads to superior strength and strain hardening. A magnitude in stress drop is governed by dislocation density, phase type, and lattice defects, irrespective of processing method. FCC {200} notably influences recovery behavior after stress drop, and the contribution of strain energy density by serration on tensile toughness was the greatest for HR-CoCrNi.