Ni–Ti-Hf High-Temperature Shape Memory Alloy: Measure of the Clausius-Clapeyron Coefficient Through Mechanical Spectroscopy

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Date
2021-03-05
Author
Pérez Cerrato, Mikel ORCID
Maass, B.
Nó Sánchez, María Luisa
San Juan Núñez, José María ORCID
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  Estadisticas en RECOLECTA
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Journal Of Alloys And Compounds 856 : (2021) // Article ID 157948
URI
http://hdl.handle.net/10810/51637
Abstract
The martensitic transformation of Ni49.5Ti35.5Hf15 high temperature shape memory alloy is characterized by internal friction measurements. The temperatures for the reversible B2 <-> B19' transformation appear in the range 410-479 K on cooling and 447-526 K on heating. In addition, a strong anomalous pre-martensitic softening of the dynamic modulus is reported in the high-temperature phase, between 850 K and 550 K, evidencing the thermoelastic character of this family of alloys. Based on the analysis of the internal friction spectra, a theoretical and experimental methodology is proposed to measure the Clausius-Clapeyron coefficient through mechanical spectroscopy. This new non-destructive method could be extremely useful for the development of advanced prototypes of shape memory alloys.
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Except where otherwise noted, this item's license is described as This article is available under the Creative Commons CC-BY-NC-ND license