Electrochemical characterization of a Fe-based shape memory alloy in an alkaline medium and the behaviour in aggressive conditions

Collazo, A.; Figueroa, R.; Mariño-Martínez, Carmen; Nóvoa, X.R.; Pérez, C.

doi:10.1016/j.electacta.2023.142034

Cited by 8 publications

(1 citation statement)

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“…Fine plates of ε-martensite can also be observed, which is usually more pronounced in pre-stressed samples. The identification of this phase on unstressed samples is unexpected; however, it has also been observed in other studies, and it is possible that this may result from internal stresses around the nanoparticles found in this type of alloy [63]. The prestressed samples also showed twins generated during mechanical stress (Figure 1c,d).…”

Section: Discussionsupporting

confidence: 67%

Investigations on the Degradation Behavior of Processed FeMnSi-xCu Shape Memory Alloys

Roman,

Cimpoeșu,

Pricop

et al. 2024

Nanomaterials

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A new functional Fe-30Mn-5Si-xCu (x = 1.5 and 2 wt%) biomaterial was obtained from the levitation induction melting process and evaluated as a biodegradable material. The degradation characteristics were assessed in vitro using immersion tests in simulated body fluid (SBF) at 37 ± 1 °C, evaluating mass loss, pH variation that occurred in the solution, open circuit potential (OCP), linear and cyclic potentiometry (LP and CP), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and nano-FTIR. To obtain plates as samples, the cast materials were thermo-mechanically processed by hot rolling. Dynamic mechanical analysis (DMA) was employed to evaluate the thermal properties of the smart material. Atomic force microscopy (AFM) was used to show the nanometric and microstructural changes during the hot rolling process and DMA solicitations. The type of corrosion identified was generalized corrosion, and over the first 3–5 days, an increase in mass was observed, caused by the compounds formed at the metal–solution interface. The formed compounds were identified mainly as oxides that passed into the immersion liquid. The degradation rate (DR) was obtained as a function of mass loss, sample surface area and immersion duration. The dynamic mechanical behavior and dimensions of the sample were evaluated after 14 days of immersion. The nanocompounds found on the surface after atmospheric corrosion and immersion in SBF were investigated with the Neaspec system using the nano-FTIR technique.

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Section: Discussionsupporting

confidence: 67%

Investigations on the Degradation Behavior of Processed FeMnSi-xCu Shape Memory Alloys

Roman,

Cimpoeșu,

Pricop

et al. 2024

Nanomaterials

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Effect of Ferrite Second Phase on Shape Memory Effect of Corrosion‐Resistant Fe–Mn–Si Shape Memory Alloy

Pan,

Zhang,

Zhang

2024

steel research int.

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At present, Fe–Mn–Si shape memory alloy with high corrosion resistance has become the focus of attention because of its special requirements in some fields. On the basis of Fe–Mn–Si shape memory alloy, a corrosion‐resistant shape memory alloy was designed by adding Cr and other alloy elements. The microstructure characteristics and phase ratio control mechanism of the annealed alloy and the influence mechanism of the second phase (ferrite) and ratio on the alloy memory effect are emphatically studied. The results show that ferrite and austenite are evenly distributed at low annealing temperature, and there is thermal‐induced ε‐martensite at the same time. Appropriate thermal‐induced ε‐martensite can strengthen the austenite matrix, and the shape recovery rate is high at this time. With the increase of annealing temperature, the volume fraction and grain size of ferrite increase, the volume fraction of thermal‐induced ε‐martensite and austenite decreases, and the shape recovery rate decreases, but it is beneficial to improve the corrosion resistance.

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Effects of passivation behavior on micro-electrochemical machining (ECM) performance of stainless steels with different metallographic phases in NaNO3 and NaClO3 solutions

Liu,

Shi,

Yang

et al. 2024

Int J Adv Manuf Technol

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Electrochemical characterization of a Fe-based shape memory alloy in an alkaline medium and the behaviour in aggressive conditions

Cited by 8 publications

References 50 publications

Investigations on the Degradation Behavior of Processed FeMnSi-xCu Shape Memory Alloys

Investigations on the Degradation Behavior of Processed FeMnSi-xCu Shape Memory Alloys

Effect of Ferrite Second Phase on Shape Memory Effect of Corrosion‐Resistant Fe–Mn–Si Shape Memory Alloy

Effects of passivation behavior on micro-electrochemical machining (ECM) performance of stainless steels with different metallographic phases in NaNO3 and NaClO3 solutions

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