Multifunctional metallic nanocomposite for overcoming the strength-ductility trade-off.

Autor: Lanba AR; Department of Engineering Science and Mechanics, Pennsylvania State University, 212 Earth-Engineering Sciences Bldg., University Park, PA, 16802-6812, USA. asheesh.lanba@maine.edu.; Department of Engineering, University of Southern Maine, 37 College Ave., Gorham, ME, 04038, USA. asheesh.lanba@maine.edu.; Composites Engineering Research Laboratory (CERL), University of Southern Maine, 96 Falmouth Street, Portland, ME, 04103, USA. asheesh.lanba@maine.edu., Hamilton RF; Department of Engineering Science and Mechanics, Pennsylvania State University, 212 Earth-Engineering Sciences Bldg., University Park, PA, 16802-6812, USA. rfhamilton@psu.edu., Melanson AN; Department of Engineering, University of Southern Maine, 37 College Ave., Gorham, ME, 04038, USA.; Composites Engineering Research Laboratory (CERL), University of Southern Maine, 96 Falmouth Street, Portland, ME, 04103, USA., Perry ES; Electron Microscopy Laboratory, University of Maine, 23 Flagstaff Road, Orono, ME, 04469, USA., Gordon RF; Medical Metals, LLC, Ridgefield, CT, 06877, USA.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2024 Jan 10; Vol. 14 (1), pp. 1046. Date of Electronic Publication: 2024 Jan 10.
DOI: 10.1038/s41598-023-50967-8
Abstrakt: The actualization of high strength and ductility in alloys, in addition to providing strong, formable materials, can lead to reduced weights in practical applications. However, increasing strength typically comes at the cost of lowering the ductility and vice-versa, referred to as the strength-ductility trade-off. In this work, we investigate the thermo-mechanical response of a 3-element multifunctional NiTi-Nb nanocomposite material that overcomes this trade-off, as it exhibits a high strength of 980 MPa and an ultrahigh ductility of 58% at fracture. The remarkable properties are attributed to the underlying microstructure of Nb nanofibers dispersed in an NiTi matrix. Deformation is accommodated via the shape memory transformation of the active NiTi matrix in concert with elastoplastic deformation of Nb nanofibers embedded within the matrix. Consequently, the material exhibits multifunctionality and recovers deformation during heating via the reversion of the stress-induced martensitic transformation in the NiTi matrix. The high strength and high ductility of this 3-element nanocomposite material puts it amongst the best performing high-entropy alloys (HEAs) that are typically made up of five or more elements.
(© 2024. The Author(s).)
Databáze: MEDLINE
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