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Characterization of Thermomechanically Processed High-Temperature Ni-Lean NiTi–20 at.% Hf Shape Memory Wires

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Abstract

The thermomechanical processability of Ti(Hf)-rich Ni49.8Ti30.2Hf20 (at.%) high-temperature shape memory alloy (HTSMA) wires was examined. Hot-extruded rods with an initial diameter of 6.35 mm were hot-rolled and cold-drawn into a final diameter of 260 µm. For all samples, processing was performed in open air without extrusion canning. The HTSMA rods were processed to an area reduction of 99.83%. Experimental results showed that hot-rolling at 800 °C decreased the grain size and introduced a small amount of retained austenite, while breaking up the Ti4Ni2Ox intermetallic oxide phase, resulting in a 10 °C decrease of the austenite start temperature (As). While both hot-rolling and cold-drawing exhibited clear effects on the thermomechanical properties, neither the number of hot-rolling passes nor the number of cold-drawing passes affected the transformation temperatures of the material. Additionally, the NiTiHf HTSMA showed similar thermomechanical responses after the 5th and 25th hot pass when subjected to room temperature loading to 500 MPa (uniaxial tension) and thermally induced shape recovery.

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Acknowledgements

The authors thank Matthew Carl at UNT for providing help with diffraction analysis and Yang Ren, beam line scientist, for helping with the experiments at Advanced Photon Source (APS). This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. The authors gratefully acknowledge financial support from the NASA Aeronautics Research Mission Directorate (ARMD) Transformational Tools and Technologies (TTT) project (Contract # NNC16VA71P). The authors acknowledge the Materials Research Facility (MRF) at the University of North Texas (UNT) for providing access to characterization equipment.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, University of North Texas, Denton, TX, 76203, USA

    Nathan A. Ley, Robert W. Wheeler & Marcus L. Young

  2. NASA Glenn Research Center, Cleveland, OH, 44135, USA

    Othmane Benafan

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  1. Nathan A. Ley
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  2. Robert W. Wheeler
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  3. Othmane Benafan
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  4. Marcus L. Young
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Correspondence to Nathan A. Ley.

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Ley, N.A., Wheeler, R.W., Benafan, O. et al. Characterization of Thermomechanically Processed High-Temperature Ni-Lean NiTi–20 at.% Hf Shape Memory Wires. Shap. Mem. Superelasticity 5, 476–485 (2019). https://doi.org/10.1007/s40830-019-00254-1

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