Temperature dependence of the stressesrcrof stress-inducedc-a0martensitic transformations (MT) andsuperelasticity (SE) were studied in tension and compression on [001]-oriented Fe-27Ni-17Co-11.7Al-2.9Nb (FeNiCoAlNb) (at.%) crystals after two-step ageing (973 K, 0.5 h + 723 K, 3h). It was shown thatthea=drcr/dT value does not depend on the stress state (tension/compression) in the range of thestress-inducedc-a0MT. SE depends on the stress state and the maximum SE strain of 11.5% was observedin compression.