Date
2022Author
Lauhoff, ChristianReul, AlexanderLangenkämper, DennisKrooß, PhilippSomsen, ChristophGutmann, Matthias JosefPedersen, BjörnKireeva, Irina V.Chumlyakov, Yuriy I.Eggeler, GunterSchmahl, Wolfgang WilhelmNiendorf, ThomasSubject
600 Technology 660 Chemical engineering Memory-LegierungDegradation <Technik>NanopartikelNeutronenbeugungMartensitumwandlungCobaltlegierungNickellegierungGalliumlegierungMetadata
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Aufsatz
Effects of aging on the stress-induced martensitic transformation and cyclic superelastic properties in Co-Ni-Ga shape memory alloy single crystals under compression
Abstract
Co-Ni-Ga shape memory alloys attracted scientific attention as promising candidate materials for damping applications at elevated temperatures, owing to excellent superelastic properties featuring a fully reversible stress-strain response up to temperatures as high as 500 °C. In the present work, the effect of aging treatments conducted in a wide range of aging temperatures and times, i.e. at 300–400 °C for 0.25–8.5 h, was investigated. It is shown that critical features of the martensitic transformation are strongly affected by the heat treatments. In particular, the formation of densely dispersed γ’-nanoparticles has a strong influence on the martensite variant selection and the morphology of martensite during stress-induced martensitic transformation. Relatively large, elongated particles promote irreversibility. In contrast, small spheroidal particles are associated with excellent functional stability during cyclic compression loading of 〈001〉-oriented single crystals. In addition to mechanical experiments, a detailed microstructural analysis was performed using in situ optical microscopy and neutron diffraction. Fundamental differences in microstructural evolution between various material states are documented and the relations between thermal treatment, microstructure and functional properties are explored and rationalized.
Citation
In: Acta Materialia Volume 226 (2022) eissn:1873-2453Additional Information
© This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/Citation
@article{doi:10.17170/kobra-2024052910239,
author={Lauhoff, Christian and Reul, Alexander and Langenkämper, Dennis and Krooß, Philipp and Somsen, Christoph and Gutmann, Matthias Josef and Pedersen, Björn and Kireeva, Irina V. and Chumlyakov, Yuriy I. and Eggeler, Gunter and Schmahl, Wolfgang Wilhelm and Niendorf, Thomas},
title={Effects of aging on the stress-induced martensitic transformation and cyclic superelastic properties in Co-Ni-Ga shape memory alloy single crystals under compression},
journal={Acta Materialia},
year={2022}
}
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2024-05-31T13:49:47Z 2024-05-31T13:49:47Z 2022 doi:10.17170/kobra-2024052910239 http://hdl.handle.net/123456789/15797 © This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/ eng Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ shape memory alloys (SMAs) aging nanoparticles neutron diffraction martensite variant selection 600 660 Effects of aging on the stress-induced martensitic transformation and cyclic superelastic properties in Co-Ni-Ga shape memory alloy single crystals under compression Aufsatz Co-Ni-Ga shape memory alloys attracted scientific attention as promising candidate materials for damping applications at elevated temperatures, owing to excellent superelastic properties featuring a fully reversible stress-strain response up to temperatures as high as 500 °C. In the present work, the effect of aging treatments conducted in a wide range of aging temperatures and times, i.e. at 300–400 °C for 0.25–8.5 h, was investigated. It is shown that critical features of the martensitic transformation are strongly affected by the heat treatments. In particular, the formation of densely dispersed γ’-nanoparticles has a strong influence on the martensite variant selection and the morphology of martensite during stress-induced martensitic transformation. Relatively large, elongated particles promote irreversibility. In contrast, small spheroidal particles are associated with excellent functional stability during cyclic compression loading of 〈001〉-oriented single crystals. In addition to mechanical experiments, a detailed microstructural analysis was performed using in situ optical microscopy and neutron diffraction. Fundamental differences in microstructural evolution between various material states are documented and the relations between thermal treatment, microstructure and functional properties are explored and rationalized. open access Lauhoff, Christian Reul, Alexander Langenkämper, Dennis Krooß, Philipp Somsen, Christoph Gutmann, Matthias Josef Pedersen, Björn Kireeva, Irina V. Chumlyakov, Yuriy I. Eggeler, Gunter Schmahl, Wolfgang Wilhelm Niendorf, Thomas doi:10.1016/j.actamat.2022.117623 Memory-Legierung Degradation <Technik> Nanopartikel Neutronenbeugung Martensitumwandlung Cobaltlegierung Nickellegierung Galliumlegierung acceptedVersion eissn:1873-2453 Acta Materialia Volume 226 false 117623
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