材料期刊网

The shape memory behavior of [111]-oriented NistTi49 (at.％) single crystals was investigated after stressassisted aging at 500 ℃ for 1.5 h under a compressive stress of-150 MPa.It was found that a single family of Ni4Ti3 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％.