| Abstract Scope |
Characterization of heavily (90%) cold-rolled, dual-phase (FCC+L21), compositionally complex alloy (CCAs) has revealed that the L21 Heusler phase, which has previously been considered as catastrophically brittle, can accommodate significant plasticity without cracking. EBSD highlights significant dislocation substructure within the Heusler phase, and deformation texture analysis and crystal plasticity modeling shows that the plasticity in this phase is accommodated by {hkl} “pencil glide” of BCC-type dislocations with <111> Burgers vectors, rather than glide of <110> dislocations known to be active in some L2¬1 and related, brittle B2-structured alloys. The examined CCAs recrystallize rapidly, apparently via a continuous, static recrystallization mechanism. Inclusion of the L21 phase results in significant grain refinement of the surrounding austenitic FCC phase, i.e., it gives rise to either enhanced nucleation or Zener pinning or both. The FCC matrix developes a crystallographic texture similar to that observed in stainless steels, irrespective of the Heusler phase content. |