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

Amini, Abbas, Cheng, Chun, Naebe, Minoo, Church, Jeffery S., Hameed, Nishar, Asgari, Alireza and Will, Frank 2013, Temperature variations at nano-scale level in phase transformed nanocrystalline NiTi shape memory alloys adjacent to graphene layers, Nanoscale, vol. 5, pp. 6479-6484.

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Title Temperature variations at nano-scale level in phase transformed nanocrystalline NiTi shape memory alloys adjacent to graphene layers
Author(s) Amini, Abbas
Cheng, Chun
Naebe, Minoo
Church, Jeffery S.
Hameed, Nishar
Asgari, Alireza
Will, Frank
Journal name Nanoscale
Volume number 5
Start page 6479
End page 6484
Total pages 6
Publisher RSC Publications
Place of publication Cambridge, England
Publication date 2013
ISSN 2040-3364
2040-3372
Summary 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 solidstate 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.
Language eng
Field of Research 099999 Engineering not elsewhere classified
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
Persistent URL http://hdl.handle.net/10536/DRO/DU:30053602

Document type: Journal Article
Collections: School of Engineering
Institute for Frontier Materials
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