Functional Fatigue of NiTi Shape Memory Alloy: Effect of Loading Frequency and Source of Residual Strains

Sidharth, R.; Mohammed, Ahmed Sameer Khan; Şehitoğlu, Hüseyin

doi:10.1007/s40830-022-00397-8

Shap. Mem. Superelasticity

2022

DOI: 10.1007/s40830-022-00397-8

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Functional Fatigue of NiTi Shape Memory Alloy: Effect of Loading Frequency and Source of Residual Strains

R. Sidharth

Ahmed Sameer Khan Mohammed

Hüseyin Şehitoğlu

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2024

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Cited by 14 publications

References 66 publications

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On the Effect of Chemical Heterogeneity on the Shape Memory Performance of Fe–Ni–Co–Al–Ti Single Crystals

Remich,

Lauhoff,

Kriegel

et al. 2024

Shap. Mem. Superelasticity

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The present work focuses on the formation of the γ′-phase and its impact on the functional properties of a Fe-28Ni–17Co–11.5Al–2,5Ti (at.-%) shape memory alloy (SMA) under cyclic loading conditions at different testing temperatures. The effect of aging treatments conducted in a wide range of aging temperatures and times was investigated. While specific heat treatments, namely 600 °C for 4 h, result in excellent superelastic properties with a fully reversible material response in single cycle experiments, interestingly, functional degradation is found to be more pronounced under cyclic loading compared to other derivatives of the Fe–Ni–Co–Al-based SMA systems. In addition to mechanical testing, a detailed microstructural analysis was conducted using transmission electron microscopy. The results of the present study clearly reveal that chemical inhomogeneities have to be carefully considered for the characterization of the functional performance of these iron-based SMAs. Chemical heterogeneities are not only identified as the underlying microstructural mechanism for the pronounced cyclic degradation behavior, but are also supposed to have a significant influence on the precipitation kinetics of the γ′-phase.

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On the Effect of Chemical Heterogeneity on the Shape Memory Performance of Fe–Ni–Co–Al–Ti Single Crystals

Remich,

Lauhoff,

Kriegel

et al. 2024

Shap. Mem. Superelasticity

View full text Add to dashboard Cite

show abstract

Thermodynamic rationale for transformation-induced dislocations in shape memory alloys

Mohammed,

Sehitoglu

2024

Acta Materialia

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Stress induced martensitic transformation in NiTi at elevated temperatures: Martensite variant microstructures, recoverable strains and plastic strains

Tyc,

Iaparova,

Molnárová

et al. 2024

Acta Materialia

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Functional Fatigue of NiTi Shape Memory Alloy: Effect of Loading Frequency and Source of Residual Strains

Cited by 14 publications

References 66 publications

On the Effect of Chemical Heterogeneity on the Shape Memory Performance of Fe–Ni–Co–Al–Ti Single Crystals

On the Effect of Chemical Heterogeneity on the Shape Memory Performance of Fe–Ni–Co–Al–Ti Single Crystals

Thermodynamic rationale for transformation-induced dislocations in shape memory alloys

Stress induced martensitic transformation in NiTi at elevated temperatures: Martensite variant microstructures, recoverable strains and plastic strains

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