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Thanks to their special functional properties, such as pseudo–elasticity or shape memory effect,NiTi alloys are more and more used in various fields. NiTi alloys are also characterized by high mechanicalperformances and high resistance to corrosion in many aggressive environments in presence of Cl- such as seaenvironments or biological environments. Shape memory effect or pseudoelastic effect are due to structuralchanges in presence of imposed deformation and/or temperature effects. In this work two NiTi alloy, oncewith a pseudo-elastic behavior and once with shape memory effect are investigated. Single cycle of load-unloadfor each alloy was effectuated on mini-specimens that allows X-ray analyses under imposed deformation. Theresults have been compared with those obtained after complete unload conditions.