Temperature variations at nano-scale level in phase transformed nanocrystalline NiTi shape memory alloys adjacent to graphene layers

Abbas Amini; Chun Cheng; Minoo Naebe; Jeffrey S. Church; Nishar Hameed; Alireza Asgari; Frank Will

doi:10.1039/C3NR01422C

Temperature variations at nano-scale level in phase transformed nanocrystalline NiTi shape memory alloys adjacent to graphene layers

Abbas Amini,*^a Chun Cheng,^b Minoo Naebe,^a Jeffrey S. Church,^c Nishar Hameed,^a Alireza Asgari^d and Frank Will^d

* Corresponding authors

^a Institute for Frontier Materials, Deakin University, Waurn Ponds, Geelong, VIC 3217, Australia
E-mail: abbas.amini@deakin.edu.au
Tel: +61 3524 79122

^b Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA

^c CSIRO Materials Science and Engineering, Belmont, Victoria 3216, Australia

^d School of Engineering, Deakin University, Waurn Ponds, Geelong, VIC 3217, Australia

Abstract

The detection and control of the temperature variation at the nano-scale level of thermo-mechanical materials during a compression process have been challenging issues. In this paper, an empirical method is proposed to predict the temperature at the nano-scale level during the solid-state phase transition phenomenon in NiTi shape memory alloys. Isothermal data was used as a reference to determine the temperature change at different loading rates. The temperature of the phase transformed zone underneath the tip increased by ∼3 to 40 °C as the loading rate increased. The temperature approached a constant with further increase in indentation depth. A few layers of graphene were used to enhance the cooling process at different loading rates. Due to the presence of graphene layers the temperature beneath the tip decreased by a further ∼3 to 10 °C depending on the loading rate. Compared with highly polished NiTi, deeper indentation depths were also observed during the solid-state phase transition, especially at the rate dependent zones. Larger superelastic deformations confirmed that the latent heat transfer through the deposited graphene layers allowed a larger phase transition volume and, therefore, more stress relaxation and penetration depth.

Article information

https://doi.org/10.1039/C3NR01422C

Article type

Paper

Submitted

22 Mar 2013

Accepted

17 May 2013

First published

21 May 2013

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Nanoscale, 2013,5, 6479-6484

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Temperature variations at nano-scale level in phase transformed nanocrystalline NiTi shape memory alloys adjacent to graphene layers

A. Amini, C. Cheng, M. Naebe, J. S. Church, N. Hameed, A. Asgari and F. Will, Nanoscale, 2013, 5, 6479 DOI: 10.1039/C3NR01422C

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Temperature variations at nano-scale level in phase transformed nanocrystalline NiTi shape memory alloys adjacent to graphene layers

Abstract

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Temperature variations at nano-scale level in phase transformed nanocrystalline NiTi shape memory alloys adjacent to graphene layers

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