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Cobalt addition effects on martensitic transformation and microstructural properties of high-temperature Cu–Al–Fe shape-memory alloys

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Abstract

The effects of the addition of Co on the martensitic transformation and microstructural properties of high-temperature Cu–Al–Fe shape-memory alloy systems were studied by means of DSC, XRD, optical microscopy and Vickers microhardness measurements. DSC analyses indicated that the Cu–Al–Fe alloy displayed high-temperature shape-memory characteristics and that the Co additions dramatically influenced the martensitic transformation of the alloys. Structural and morphological investigations showed that the alloys had 18R martensite structure and contained different precipitates. With increasing amounts of Co, it was seen that elemental compositions of precipitates changed and their volume fractions increased and, therefore, both thermal stability and microhardness values of the alloys were affected. As a result, whereas microhardness values of the alloys were increased by 313 ± 7.76 to 365.75 ± 7.84 Hv, the alloys exhibited poor thermal stability and high volume fraction of precipitates following Co addition.

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Acknowledgements

We wish to thank Professor Yusuf Atıcı (Firat University) and Professor Yıldırım Aydoğdu (Gazi University) due to their helpful support, and also Dr. Selçuk Aktürk (Mugla Sitki Kocman University) for EDS analyses.

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  1. Department of Physics, Firat University, 23119, Elazig, Turkey

    Koksal Yildiz, Mediha Kök & Fethi Dağdelen

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  1. Koksal Yildiz
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  2. Mediha Kök
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  3. Fethi Dağdelen
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Correspondence to Koksal Yildiz.

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Yildiz, K., Kök, M. & Dağdelen, F. Cobalt addition effects on martensitic transformation and microstructural properties of high-temperature Cu–Al–Fe shape-memory alloys. J Therm Anal Calorim 120, 1227–1232 (2015). https://doi.org/10.1007/s10973-015-4395-5

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  • DOI: https://doi.org/10.1007/s10973-015-4395-5

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