A new experimental method for measuring stress-temperature phase diagram in shape memory alloys. (September 2018)

• Record Type: Journal Article
• Authors: Bronstein, Emil; Faran, Eilon; Shilo, Doron
• Is Part Of: Scripta materialia. Number 154(2018)
• Page Start: 145
• Page End: 148
• Publication Date: 2018-09
• Subjects: Shape memory alloys (SMA) -- Martensitic phase transformation -- Phase diagram; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.05.039
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: 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. Graphical abstract: Unlabelled Image