A new experimental method for measuring stress-temperature phase diagram in shape memory alloys

The martensitic phase transformation in shape memory alloys (SMA) can be described by stress-temperature phase diagram, which provides fundamental scientific and applications-related information on this important process. We present a new experimental method that enables direct measurement of the co...

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Bibliographic Details
Published in:Scripta materialia 2018-09, Vol.154, p.145-148
Main Authors: Bronstein, Emil, Faran, Eilon, Shilo, Doron
Format: Article
Language:English
Subjects:
Martensitic phase transformation
Phase diagram
Shape memory alloys (SMA)
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Summary:The martensitic phase transformation in shape memory alloys (SMA) can be described by stress-temperature phase diagram, which provides fundamental scientific and applications-related information on this important process. We present a new experimental method that enables direct measurement of the complete stress-temperature phase diagram of SMA within a single experiment. The experimental setup is placed under an optical microscope and allows complementary visualization of the microstructure evolution throughout the phase transformation. The method is demonstrated on a SMA Ni-Mn-Ga single crystal, and the values of the Clausius-Clapeyron relation along with the latent heat of the transformation are extracted. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2018.05.039