Journal of Thermal Analysis and Calorimetry

, Volume 139, Issue 2, pp 823–829 | Cite as

The effect of e/a ratio on thermodynamic parameters and surface morphology of Cu–Al–Fe–X shape memory alloys

  • Canan Aksu CanbayEmail author
  • Sivar Aziz
  • İskender Özkul
  • Aysegül Dere


In this study, four Cu–Al–Fe–X shape memory alloys were produced by the arc melting technique, and the martensitic transformation temperatures, thermodynamic parameters, and the activation energy values were obtained. The activation energy values of the alloys were calculated as 666.36, 401.6, 82.94, and 226.22 kJ mol−1 for S1, S2, S3, and S4, respectively. High-temperature phase transitions and eutectoid point of the samples were examined by the differential thermal analysis method. The martensitic diffraction planes of the samples were found as 122, 0022, 1210, and 2012, and the crystallite size of the samples was calculated as 16.21, 20.20, 14.43, and 17.46, respectively. Lastly, optical micrograph observations revealed the morphology of the alloys and the variations in the grains and martensite structures. The e/a ratio of the alloys varied 1.47–1.51, and these values are in agreement with the values in literature to give shape memory effect.


e/a ratio Thermodynamic parameters Phase transition Microstructure 



This work was financially supported by FÜBAP, Project No: FF.18.21.


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© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.Department of Physics, Faculty of ScienceFirat UniversityElazigTurkey
  2. 2.Mechanical Engineering Department, Engineering FacultyMersin UniversityMersinTurkey

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