On the deformation response and cyclic stability of Ni50Ti35Hf15 high temperature shape memory alloy wires

The processing - phase transformation - deformation response relationship of Ni50Ti35Hf15 high temperature shape memory alloy was studied. As the material was hot extruded and further underwent wire drawing, the phase transformation temperatures decreased and the strength levels increased, yet the i...

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Bibliographic Details
Published in:Scripta materialia 2017-07, Vol.135, p.92-96
Main Authors: Canadinc, D., Trehern, W., Ozcan, H., Hayrettin, C., Karakoc, O., Karaman, I., Sun, F., Chaudhry, Z.
Format: Article
Language:English
Subjects:
High temperature shape memory alloys
Martensitic transformation
NiTiHf
Superelasticity
Training
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Summary:The processing - phase transformation - deformation response relationship of Ni50Ti35Hf15 high temperature shape memory alloy was studied. As the material was hot extruded and further underwent wire drawing, the phase transformation temperatures decreased and the strength levels increased, yet the initial brittle response was replaced by near-perfect superelastic response above the austenite finish temperature. Moreover, the Ni50Ti35Hf15 wires exhibited a remarkably stable cyclic actuation response under 300MPa, as compared to the poor cyclic stability of the hot extruded samples, which is beyond the operating stress levels for known shape memory actuators. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2017.03.025