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Functionally Graded Shape-Memory and Pseudoelastic Response in Ni-Rich/Ti-Rich and Vice Versa NiTi Multilayer Thin Films Deposited on Si(111)

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Abstract

In this study, functionally graded NiTi multilayer thin films were created by radio frequency magnetrun sputtering and subsequent annealing. The chemical compositions of the multilayer thin films which determined by energy-dispersive x-ray spectroscopy are about Ni51Ti/Ni49Ti (numbers indicate at.%). The structures, surface morphology, and transformation temperatures of annealed thin films at 500°C for 1 h were studied using grazing incidence x-ray diffraction, atomic force microscopy, and differential scanning calorimetry (DSC), respectively. Moreover, a coupled nanoindentation/atomic force microscopy technique is employed to characterize both the superelastic and shape memory effects. Specifically, an analysis of recoverable energy through the stress-induced phase transformation and recoverable strain through de-twinning and the subsequent thermally induced phase transformation were performed. The DSC and x-ray diffraction results indicated the multilayer was composed of austenitic and martensitic thin films. The continuous stiffness measurement technique showed that the stiffness and elastic modulus of the multilayer change gradually through the thickness of the multilayer thin films. Also, the thin films exhibited a combined pseudoelastic behavior and shape-memory effect which produces a two-way shape-memory effect in both thin films.

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Acknowledgements

The author gratefully acknowledges Prof. Horst Hahn at the Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), for providing sample preparation and characterization facilities. The authors also acknowledge the partial financial support of this work by the Iranian National Science foundation.

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Authors and Affiliations

  1. School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran

    Maryam Mohri & Mahmoud Nili-Ahmadabadi

  2. Center of Excellence for High Performance Materials, University of Tehran, Tehran, Iran

    Mahmoud Nili-Ahmadabadi

Authors
  1. Maryam Mohri
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  2. Mahmoud Nili-Ahmadabadi
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Correspondence to Maryam Mohri.

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Mohri, M., Nili-Ahmadabadi, M. Functionally Graded Shape-Memory and Pseudoelastic Response in Ni-Rich/Ti-Rich and Vice Versa NiTi Multilayer Thin Films Deposited on Si(111). JOM 67, 1585–1593 (2015). https://doi.org/10.1007/s11837-015-1339-2

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  • DOI: https://doi.org/10.1007/s11837-015-1339-2

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