Development of High-Entropy Shape-Memory Alloys: Structure and Properties
G. S. Firstov$^{1}$, Yu. M. Koval$^{1}$, V. S. Filatova$^{1}$, V. V. Odnosum$^{1}$, G. Gerstein$^{2}$, and H. J. Maier$^{2}$
$^1$G. V. Kurdyumov Institute for Metal Physics of the N.A.S. of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
$^2$Institut für Werkstoffkunde Leibniz Universität Hannover, An der Universität 2, D-30823 Garbsen, Germany
Received 01.12.2023; final version — 12.12.2023 Download PDF
Abstract
Amongst functional materials shape memory alloys occupy a special position. After their discovery, these alloys attracted substantial attention because of the possibility to restore significant deformation amounts under certain stress-temperature conditions due to the martensitic diffusionless phase transformation involved. It was possible to exploit not only so-called ‘shape memory’ but also superelasticity and high damping capacity. Over the years, more than 10 000 patents on shape memory alloys were filed appreciating not only the possibility to exploit the effect for energy transformation while changing independent thermodynamic parameters (temperature, stress, pressure, electric or magnetic field etc.) but the significant work output as well. The envisaged shape memory components covered applications in the automotive, aero-space, machine-building and civil construction industries. Unfortunately, structural and functional fatigue restricted successful business application mostly to the medical sector, with the Nitinol shape memory alloy dominating applications such as different implants, stents or cardiovascular valves. Emerging high entropy shape memory alloys can be considered as a chance to overcome the fatigue problems of today’s shape memory alloys due to their specific structure that ensures superior resistance to irreversible plastic deformation.
Keywords: high-entropy shape-memory alloys, martensitic transformation, structure, multiple principal element intermetallic compounds, mechanical properties, shape memory and related phenomena.
DOI: https://doi.org/10.15407/ufm.24.04.819
Citation: G. S. Firstov, Yu. M. Koval, V. S. Filatova, V. V. Odnosum, G. Gerstein, and H. J. Maier, Development of High-Entropy Shape-Memory Alloys: Structure and Properties, Progress in Physics of Metals, 24, No. 4: 819–837 (2023)