Transformation temperatures of shape memory alloy based on electromechanical impedance technique

[Display omitted] •EMI technique was applied to determine the transformation temperatures of SMA.•Ni-Ti/PZT heterostructure was investigated using EMI.•Analysis under thermal cycling was performed with temperature ramp up/down and different frequencies.•Measurements using DSC for raw and cycled Ni-T...

Full description

Saved in:
Bibliographic Details
Published in:Measurement : journal of the International Measurement Confederation 2019-10, Vol.145, p.55-62
Main Authors: Cunha, Maxsuel F., Sobrinho, José M.B., Souto, Cícero R., dos Santos, Alexsandro J.V., de Castro, Alexandre C., Ries, Andreas, Sarmento, Nathan L.D.
Format: Article
Language:English
Subjects:
Alloys
Differential scanning calorimetry
Electromechanical Impedance
Frequency analysis
Heterostructure
Heterostructures
Impedance
Lead zirconate titanates
Martensitic transformations
Microstructure
Nickel base alloys
Phase transitions
Piezoelectric
Shape Memory Alloys
Sweep frequency
Temperature
Thermal cycling
Transformation temperature
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:[Display omitted] •EMI technique was applied to determine the transformation temperatures of SMA.•Ni-Ti/PZT heterostructure was investigated using EMI.•Analysis under thermal cycling was performed with temperature ramp up/down and different frequencies.•Measurements using DSC for raw and cycled Ni-Ti alloy were compared to the proposed method.•Results indicate the feasibility of the proposed method to measure transformation temperatures of SMAs. 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.
ISSN:0263-2241
1873-412X
DOI:10.1016/j.measurement.2019.05.050