Dislocation processes and deformation behavior in (Fe,Ni)-Al single crystals

The mechanical properties and the dislocation microstructure of single crystals with a range of compositions within the (Fe,Ni)–Al pseudobinary system have been investigated, with the purpose of bridging the behavior from FeAl to NiAl. Initial experiments are focused on compression testing of (001) oriented single crystals with a family of compositions of the form Fex-Ni60_x–Al40 (where x = 60, 50 and 10 at.%). Measurements of yield strength and work hardening rates have been correlated with overall dislocation morphology, dislocation dissociation width and the presence of APB tubes.