Composition and annealing effects on the mechanical properties of superelastic thin film nickel titanium

Jason L. Woolman; Kotekar Panduranga Mohanchandra; Gregory Paul Carman

doi:10.1117/12.484707

13 August 2003 Composition and annealing effects on the mechanical properties of superelastic thin film nickel titanium

Jason L. Woolman, Kotekar Panduranga Mohanchandra, Gregory Paul Carman

Proceedings Volume 5053, Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics; (2003) https://doi.org/10.1117/12.484707
Event: Smart Structures and Materials, 2003, San Diego, California, United States

Abstract

This work examines the influence of annealing temperature on the transformation temperatures, stress necessary to induce martensite (sAM), and the Young's modulus of superelastic NiTi of two different compositions--47.5 at.% Ni and 50.5 at.% Ni. The films were sputter deposited, crystallized, and annealed for two hours at three different temperatures of 400°C, 500°C, and 600°C. Isothermal tensile tests at the austenite finish temperature (Af) were performed for evaluating the mechanical response. For the 47.5 at.% Ni film, increasing the annealing temperature from 400°C to 500°C decreased sAM by 55 MPa, while the film annealed at 600°C failed to demonstrate complete superelastic behavior. For the 50.5 at.% Ni film, increasing the annealing temperature from 400°C to 600°C decreased sAM by 138 MPa. Results were explained using the transformation temperatures and the Clausius-Clapeyron relationship.

Citation Download Citation

Jason L. Woolman, Kotekar Panduranga Mohanchandra, and Gregory Paul Carman "Composition and annealing effects on the mechanical properties of superelastic thin film nickel titanium", Proc. SPIE 5053, Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics, (13 August 2003); https://doi.org/10.1117/12.484707

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