Dr. Mehmet Mete Mete Ozturk Profile

Dr. Mehmet Mete Mete Ozturk

at Univ of Arkansas

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Proceedings Article | 3 April 2013 Paper

Thermal response of infinitely extended layered nickel-titanium shape memory alloy thin film with variable material properties

Abhijit Bhattacharyya, Mehmet Mete Ozturk

Proceedings Volume 8689, 868911 (2013) https://doi.org/10.1117/12.2008840

KEYWORDS: Thin films, Shape memory alloys, Thermal modeling, Crystals, Chemical elements, Thermal effects, Interfaces, Systems modeling, Performance modeling, Temperature metrology

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This paper reports a study of the thermal response of an infinitely extended shape memory alloy thin film. Motivated by experiments reported in the literature about SMA thin films on a silicon substrate, the thin film is taken to have three layers from the bottom to the top – an amorphous layer, a non-transforming austenitic layer and a transforming SMA layer. The boundary conditions are taken to be adiabatic and convective at the bottom of the film and the top respectively. The material properties of the transforming layer (thermal conductivity, electrical resistivity and specific heat) are taken to evolve hysteretically with temperature, commencing from an initial room temperature state of martensite. All the results are presented in non-dimensional form. The steady state results are compared with an analytical solution. The computations of the transient response are carried out with ANSYS. The thermal response of the 3-layer model is compared with that of a 1-layer model (where the entire film is a SMA transforming layer) and it is seen that the the temperature of the top surface for the 3-layer model is higher than that of the 1-layer model. It is also seen that the evolution of the specific heat has the least effect whereas the evolution of the electrical resistivity has the most effect on the thermal response of the 3-layer model. The thermal response of the infinitely extended films provides a benchmark against which the response of finite sized films can be assessed.

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