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Investigation of the thermal and microstructural changes of CuAlNiNb quaternary shape memory alloys by different niobium amount

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Abstract.

Among the CuAl-based alloys, the most useful one is the CuAlNi ternary shape memory alloy. There are studies on the development of these alloys. In this study, \(\beta\)-Nb element was added to the CuAlNi alloy as a fourth element at various rates. The effect of the doped Nb element on the martensitic transformation temperature of the CuAlNi-shape memory alloy was determined by differential scanning calorimetry (DSC). When the value of transformation temperature in quaternary CuAlNi alloys increased, as a result, austenite start and martensite start temperatures are close to each other. Crystalline structure analysis with X-ray diffractometer revealed that \(\beta 1^{\prime}\) and \(\gamma 1^{\prime}\) phases were found in Cu83.5Ni3.5Al13 alloy, which is the main alloy, while crystal structure of \(\beta\)-Nb phase was also found with Nb addition. Likewise, the same phases were determined by SEM-EDX analysis. In addition, the result of Vickers hardness measurements indicated that the hardness value of CuAlNi alloys increased by extent of contribution of Nb.

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Authors and Affiliations

  1. Inonu University, Vocational School of Health Service, Malatya, Turkey

    Z. Deniz Cırak

  2. Fırat University, Faculty of Science, Department of Physics, Elazığ, Turkey

    Mediha Kök

Authors
  1. Z. Deniz Cırak
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  2. Mediha Kök
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Correspondence to Z. Deniz Cırak.

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Deniz Cırak, Z., Kök, M. Investigation of the thermal and microstructural changes of CuAlNiNb quaternary shape memory alloys by different niobium amount. Eur. Phys. J. Plus 133, 288 (2018). https://doi.org/10.1140/epjp/i2018-12150-7

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  • DOI: https://doi.org/10.1140/epjp/i2018-12150-7

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