The shape memory behavior of [111]-oriented Ni_(51)Ti_(49) (at.%) single crystals was investigated after stressassisted aging at 500 °C for 1.5 h under a compressive stress of-150 MPa.It was found that a single family of Ni_4Ti_3 precipitates with two crystallographically equivalent variants was formed after aging under compressive stress.Stressassisted aging resulted in tensile two-way shape memory effect strain of 1.56% under-5 MPa.Thermal cycling under-600 MPa resulted in a transformation strain of-2.15%,while the subsequent thermal cycling under-5 MPa resulted in a tensile two-way shape memory effect strain of 2.2%. The shape memory behavior of [111] -oriented Ni_ (51) Ti_ (49) (at.%) Single crystals was investigated after stress aging at 500 ° C for 1.5 h under a compressive stress of-150 MPa. A single family of Ni_4Ti_3 precipitates with two crystallographically equivalent variants was formed after aging under compressive stress. Stressassisted aging induced in tensile two-way shape memory effect strain of 1.56% under-5 MPa. of-2.15%, while the subsequent thermal cycling under-5 MPa resulted in a tensile two-way shape memory effect strain of 2.2%.