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Effect of a fourth alloying element on the microstructure and mechanical properties of Cu–Al–Ni shape memory alloys

Published online by Cambridge University Press:  27 July 2015

Safaa N. Saud ,
Esah Hamzah ,
Tuty Abubakar ,
Mustafa K. Ibrahim  and
Abdollah Bahador
Safaa N. Saud
Affiliation:
Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, Johor Bahru, Johor 81310, Malaysia
Esah Hamzah*
Affiliation:
Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, Johor Bahru, Johor 81310, Malaysia
Tuty Abubakar
Affiliation:
Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, Johor Bahru, Johor 81310, Malaysia
Mustafa K. Ibrahim
Affiliation:
Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, Johor Bahru, Johor 81310, Malaysia
Abdollah Bahador
Affiliation:
Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, Johor Bahru, Johor 81310, Malaysia
*
a)Address all correspondence to this author. e-mail: esah@fkm.utm.my
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Abstract

The present investigation aims to enhance the mechanical properties and shape memory characteristics of Cu–Ni–Al shape memory alloys (SMAs) by alloying additional elements. These additions were found to control the phase morphology and grain size, along with the formation of different volume fractions, sizes, and distributions of precipitates. The features of the precipitates were mainly dependent on the type of alloying element. It was found that a Co (1.14 wt%) alloy gave the best overall improvement in terms of the transformation temperatures, ductility, and shape memory recovery. These improvements were mainly due to the exceptionally high presence of the γ2 phase in the microstructures of the modified alloy. The results of the current investigation were analyzed and compared to those of previous studies related to Cu–Al–Ni SMAs.

Keywords

Cu–Al–Ni SMAmartensitic transformationprecipitationalloying elements
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 14 , 28 July 2015 , pp. 2258 - 2269
Copyright
Copyright © Materials Research Society 2015 

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