Abstract
This paper presents the use of Electromechanical Impedance (EMI) technique as an alternative tool to measure phase transformation temperatures of Shape Memory Alloys (SMAs). Differential Scanning Calorimetry (DSC) is the most common tool used to identify the transformation temperatures of SMAs. Meanwhile this work proposes a method based on a different operating principle, named as EMIH (Electromechanical Impedance Heterostructure). Samples composed of Lead Zirconate Titanate (PZT) ceramics and Ni-Ti alloys were investigated. The proposed method is quantitatively evaluated by means of impedance magnitude and phase angle measurements with different fixed frequencies, besides sweep frequency analysis. These analyses are intended to observe the phase transformation process by means of an impedance-based technique under thermal cycling. PZT/Steel, PZT/Copper and PZT/Brass samples were also analyzed by EMI in order to compare results with PZT/SMA, and for validating purposes. Experimental phase transformation temperatures present errors between 4.9% and 35.2% when compared to DSC method.
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