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Shape Memory Effect and Superelasticity of [001]-Oriented FeNiCoAlNb Single Crystals Aged under and without Stress
Abstract
The two-step ageing of Fe-28Ni-17Co-11.5Al-2.5Nb (at.%) single crystals under and without stress, leads to the precipitation of the γ′- and β-phase particles. Research has shown that γ–α′ thermoelastic martensitic transformation (MT), with shape memory effect (SME) and superelasticity (SE), develops in the [001]-oriented crystals under tension. SE was observed within the range from the temperature of the start of MT upon cooling Mₛ, to the temperature of the end of the reverse MT upon heating Af, and at temperatures from Af to 323–373 K. It was found that at γ–α′ MT in the [001]-oriented crystals, with γ′- and β-phase particles, a high level of elastic energy, ΔGₑₗ, is generated, which significantly exceeds the energy dissipation, ΔGdis. As a result, the temperature of the start of the reverse MT, while heating Aₛ, became lower than the temperature Mₛ. The development of γ–α′ MT under stress occurs with high values of the transformation hardening coefficient, Θ = dσ/dε from 2 to 8 GPa and low values of mechanical Δσ and thermal ΔTₕ hysteresis. The reasons for an increase in ΔGₑₗ during the development of γ–α′ MT under stress are discussed.
Citation
In: Metals Volume 11 / Issue 6 (2021-06-10) eissn:2075-4701Citation
@article{doi:10.17170/kobra-202308118603,
author={Chumlyakov, Yuriy I. and Kireeva, Irina V. and Pobedennaya, Zinaida V. and Krooß, Philipp and Niendorf, Thomas},
title={Shape Memory Effect and Superelasticity of [001]-Oriented FeNiCoAlNb Single Crystals Aged under and without Stress},
journal={Metals},
year={2021}
}
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2023-08-11T11:23:10Z 2023-08-11T11:23:10Z 2021-06-10 doi:10.17170/kobra-202308118603 http://hdl.handle.net/123456789/14983 eng Namensnennung 4.0 International http://creativecommons.org/licenses/by/4.0/ iron-based shape memory alloy single crystals particles of γ′- and β-phase superelasticity tension 600 Shape Memory Effect and Superelasticity of [001]-Oriented FeNiCoAlNb Single Crystals Aged under and without Stress Aufsatz The two-step ageing of Fe-28Ni-17Co-11.5Al-2.5Nb (at.%) single crystals under and without stress, leads to the precipitation of the γ′- and β-phase particles. Research has shown that γ–α′ thermoelastic martensitic transformation (MT), with shape memory effect (SME) and superelasticity (SE), develops in the [001]-oriented crystals under tension. SE was observed within the range from the temperature of the start of MT upon cooling Mₛ, to the temperature of the end of the reverse MT upon heating Af, and at temperatures from Af to 323–373 K. It was found that at γ–α′ MT in the [001]-oriented crystals, with γ′- and β-phase particles, a high level of elastic energy, ΔGₑₗ, is generated, which significantly exceeds the energy dissipation, ΔGdis. As a result, the temperature of the start of the reverse MT, while heating Aₛ, became lower than the temperature Mₛ. The development of γ–α′ MT under stress occurs with high values of the transformation hardening coefficient, Θ = dσ/dε from 2 to 8 GPa and low values of mechanical Δσ and thermal ΔTₕ hysteresis. The reasons for an increase in ΔGₑₗ during the development of γ–α′ MT under stress are discussed. open access Chumlyakov, Yuriy I. Kireeva, Irina V. Pobedennaya, Zinaida V. Krooß, Philipp Niendorf, Thomas 15 Seiten doi:10.3390/met11060943 Kristall Pseudoelastizität Memory-Legierung Mechanische Spannung publishedVersion eissn:2075-4701 Issue 6 Metals Volume 11 false 943
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