Martensitic Transformation Thermodynamic and Structure Analysis of CuAlFe High-Temperature Shape Memory Alloy

Authors : Oktay Karaduman, İskender Özkul, Yakup Aydemir, Canan Aksu Canbay

Pages : 59-66

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Publication Date : 2024-09-30

Article Type : Research Paper

Abstract :The work presented in this paper reports the shape memory effect characteristics of a CuAlFe high-temperature shape memory alloy (HTSMA) with a new composition and new martensitic transformation temperatures. In this context, casting via a vacuum arc melter produced the Cu-rich ternary CuAlFe high-temperature shape memory alloy (HTSMA). Both DSC and DTA measurement thermograms showed excellent martensitic phase transformation peaks while heating the alloy up and cooling it back. The forward and reverse martensitic phase transformation peaks at different DSC heating/cooling rates had high thermal stability, and the temperature range of these transformations was found above 100 °C between 220-340 °C circa. Therefore, this classifies the alloy as a high-temperature shape memory alloy. Moreover, the formation of the martensite phases, i.e. the microstructural base mechanism for the shape memory effect of the alloy, was confirmed by X-ray diffraction (XRD) pattern obtained at room temperature using CuKα radiation. The findings of this study can be helpful in the high-temperature shape memory alloy-related application areas, in which areas different shape memory properties are highly demanded.
Keywords : Yüksek sıcaklık şekil hafızalı alaşım, CuAlFe, martensitik dönüşüm, DSC