Abstract
The shape memory behavior of [111]-oriented Ni51Ti49 (at.%) single crystals was investigated after stress-assisted aging at 500 °C 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. Stress-assisted 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%.
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Acknowledgments
This work was supported in part by the NASA Fundamental Aeronautics Program, Supersonics Project and the NASA EPSCOR program (Grant No. NNX11AQ31A), and RFBR Project (Grant No. 10-03-0154-a).
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Kaya, I., Tobe, H., Karaca, H.E. et al. Shape Memory Behavior of [111]-Oriented NiTi Single Crystals After Stress-Assisted Aging. Acta Metall. Sin. (Engl. Lett.) 29, 282–286 (2016). https://doi.org/10.1007/s40195-016-0386-1
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DOI: https://doi.org/10.1007/s40195-016-0386-1