Thermomechanical properties of Ni<sub>60%weight</sub>Ti<sub>40%weight</sub>

Dan J. Clingman; Frederick T. Calkins; Josef P. Smith

doi:10.1117/12.498548

13 August 2003 Thermomechanical properties of Ni_60%weightTi_40%weight

Dan J. Clingman, Frederick T. Calkins, Josef P. Smith

Proceedings Volume 5053, Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics; (2003) https://doi.org/10.1117/12.498548
Event: Smart Structures and Materials, 2003, San Diego, California, United States

Abstract

60-NiTinol (60% Nickel 40% Titanium content by weight) was developed by the US Naval Ordnance Laboratory in the 1950s as a structural form of NiTinol. Due to 60-NiTinol's extreme brittleness the application development was abandoned. Nitinol Technology Inc. successfully produced cutting instruments with this material in the early 90's. Subsequent work demonstrated that with the proper heat treatment the material exhibits a strong, stable, shape memory response. Unlike other Nitinol alloys, 60-Nitinol does not require cold work. Initial testing of this material shows that the transition temperature is a strong function of the heat treatment. Therefore the same ingot of material can produce samples with superelastic and shape memory effect. Samples with different heat treats exhibited transition temperatures varying from -55 C to +60 C. Additionally, appropriate heat treatment allows the material to exhibit extreme hardness (Rc 63) or a two-way shape memory effect. This paper provides the first study of the thermomechanical properties, including stress-strain curves and thermal cycling, of axially loaded slender 60-Nitinol samples. The samples were tested at extremely high stress level greater than 695 MPa (100 ksi) with recoverable strain of 2.5%. In addition, flexures designed with potential for aerospace applications were tested. This initial research shows that 60-Nitinol has some enticing advantages over 55 Nitinol, however further study is required.

Citation Download Citation

Dan J. Clingman, Frederick T. Calkins, and Josef P. Smith "Thermomechanical properties of Ni_60%weightTi_40%weight", Proc. SPIE 5053, Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics, (13 August 2003); https://doi.org/10.1117/12.498548

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