Orientation dependence of the critical stress and superelasticity in single crystals of iron-based alloy FeNiCoAlNb

The orientation dependence of the y-a’ martensitic transforation are investigated on [001]- and [0n]-single crystals Fe-28%Ni-17%Co-H.5%Al-2.5Nb (at. %) alloy aged at T=973 K, 7 hours. It is shown that the superelasticity and critical stress depends on the orientation of single crystals. Crystals are orientated along [0U]-direction doesn ’t have superelasticity