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

SCRIPTA MATERIALIA

卷:135

Article

Canadinc, D.¹  Trehern, W.¹  Ozcan, H.²  Hayrettin, C.¹  Karakoc, O.¹  Karaman, I.^1,2  Sun, F.³  Chaudhry, Z.³ 

[1] Texas A&M Univ, Dept Mat Sci & Engn, College Stn, TX 77843 USA

[2] Texas A&M Univ, Dept Mech Engn, College Stn, TX 77843 USA

[3] United Technol Res Ctr, E Hartford, CT 06108 USA

关键词: High temperature shape memory alloys;    Martensitic transformation;    Training;    Superelasticity;    NiTiHf;   

DOI  :  10.1016/j.scriptamat.2017.03.025

来源: Elsevier

【 摘 要 】

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 300 MPa, as compared to the poor cyclic stability of the hot extruded samples, which is beyond the operating stress levels for known shape memory actuators. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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