Numerical simulation and experimental investigation of the elastocaloric cooling effect in sputter-deposited TiNiCuCo thin films

  • F. Welsch
  • J. Ullrich
  • H. Ossmer
  • M. Schmidt
  • M. Kohl
  • C. Chluba
  • E. Quandt
  • A. Schütze
  • S. Seelecke
Original Article

Abstract

The exploitation of the elastocaloric effect in superelastic shape memory alloys (SMA) for cooling applications shows a promising energy efficiency potential but requires a better understanding of the non-homogeneous martensitic phase transformation. Temperature profiles on sputter-deposited superelastic \({\mathrm {Ti_{55.2}Ni_{29.3}Cu_{12.7}Co_{2.8}}}\) shape memory alloy thin films show localized release and absorption of heat during phase transformation induced by tensile deformation with a strong rate dependence. In this paper, a model for the simulation of the thermo-mechanically coupled transformation behavior of superelastic SMA is proposed and its capability to reproduce the mechanical and thermal responses observed during experiments is shown. The procedure for experiment and simulation is designed such that a significant temperature change from the initial temperature is obtained to allow potential cooling applications. The simulation of non-local effects is enabled by the use of a model based on the one-dimensional Müller–Achenbach–Seelecke model, extended by 3D mechanisms such as lateral contraction and by non-local interaction, leading to localization effects. It is implemented into the finite element software COMSOL Multiphysics, and comparisons of numerical and experimental results show that the model is capable of reproducing the localized transformation behavior with the same strain rate dependency. Additionally to the thermal and the mechanical behavior, the quantitative prediction of cooling performance with the presented model is shown.

Keywords

Elastocaloric cooling Shape memory alloy TiNiCuCo thin film Thermo-mechanical coupling Rate dependence Localization Propagating transformation fronts Finite element analysis Phase transformation Thermodynamics 

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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  1. 1.Intelligent Material Systems LabSaarland UniversitySaarbrueckenGermany
  2. 2.Lab for Measurement TechnologySaarland UniversitySaarbrueckenGermany
  3. 3.Institute of Microstructure TechnologyKarlsruhe Institute of TechnologyKarlsruheGermany
  4. 4.Institute for Material ScienceUniversity of KielKielGermany

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