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On the valence electron theory to estimate the transformation temperatures of Cu–Al-based shape memory alloys

Published online by Cambridge University Press:  11 July 2017

Eric Marchezini Mazzer Open the ORCID record for Eric Marchezini Mazzer [Opens in a new window] ,
Piter Gargarella ,
Claudio Shyinti Kiminami ,
Claudemiro Bolfarini ,
Regis Daniel Cava  and
Marina Galano
Eric Marchezini Mazzer*
Affiliation:
Department of Materials Engineering, Federal University of São Carlos, São Carlos, SP 13565-905, Brazil; Department of Materials, University of Oxford, Oxford OX1 3PH, UK; and Department of Metallurgical Engineering and Materials, Federal University of Minas Gerais, Belo Horizonte, MG 31270-901, Brazil
Piter Gargarella
Affiliation:
Department of Materials Engineering, Federal University of São Carlos, São Carlos, SP 13565-905, Brazil
Claudio Shyinti Kiminami
Affiliation:
Department of Materials Engineering, Federal University of São Carlos, São Carlos, SP 13565-905, Brazil
Claudemiro Bolfarini
Affiliation:
Department of Materials Engineering, Federal University of São Carlos, São Carlos, SP 13565-905, Brazil
Regis Daniel Cava
Affiliation:
Department of Materials Engineering, Federal University of São Carlos, São Carlos, SP 13565-905, Brazil
Marina Galano
Affiliation:
Department of Materials, University of Oxford, Oxford OX1 3PH, UK
*
a) Address all correspondence to this author. e-mail: [email protected], [email protected]
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Abstract

A systematic analysis of the correlation between the valence electrons and the transformation temperatures of Ti–Ni-based shape memory alloys has been carried out by Zarinjad and Liu. They have shown that the valence electron theory can be successfully applied to estimate these temperatures, although the mechanisms of the temperature shift during alloying remains not completely understood. Other important shape memory alloy systems with technological importance are the Cu–Al based, which deserve a thorough analysis concerning the composition influence on the transformation temperatures and the valence electron theory. In this paper, the valence electron concentration, valence electron density (VED), enthalpy of reaction, and crystallographic compatibility were analyzed to understand the mechanisms, which control the transformation temperatures of Cu–Al-based alloys. It was observed that the larger the VED, the more energy is used in the transformation. The same tendency is present when the crystallographic compatibility is smaller. These results show that the valence electron theory based on the VED plays an important role in the prediction of the temperature transformation and the energies involved in the reaction.

Keywords

phase transformationelectronic structureCu
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 16 , 28 August 2017 , pp. 3165 - 3174
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Susan B. Sinnott

References

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