A high-entropy alloy showing gigapascal superelastic stress and nearly temperature-independent modulus.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39890792.
- Also identified by DOI 10.1038/s41467-025-56580-9 and PMC identifier 11785802.
- Licence recorded as CC BY-NC-ND.
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Abstract
High-performance superelastic materials with a combination of high superelastic stress, large elastic recovery strain, and stable elastic modulus over a wide temperature range are highly desired for a variety of technological applications. Unfortunately, it is difficult to achieve these multi-functionalities simultaneously because most superelastic materials have to encounter the modulus softening effect and the limited superelastic stress, whereas most Elinvar-type materials show small elastic strain limit. Here, we report a (TiZrHf)<sub>44</sub>Ni<sub>25</sub>Cu<sub>15</sub>Co<sub>10</sub>Nb<sub>6</sub> high-entropy alloy that meets all these requirements. This alloy also shows good cyclic stability, thermally-stable capacity for elastic energy storage, high micro-hardness and good corrosion resistance, allowing it to operate stably in hostile environments. We show that its multi-functionalities stem from a natural composite microstructure, containing a highly-distorted matrix phase with strain glass transition and various structural and compositional heterogeneities from micro- to nano-scale. Our findings may provide insight into designing high-entropy alloys with unconventional and technologically-important functional properties.