Corrosion Resistance of Nitinol Wires After Deformation

Zende, Stefan; Freiberg, Katharina; Dorner, Franziska; Feth, Nils; Undisz, Andreas

doi:10.1007/s40830-019-00243-4

Cited by 8 publications

(1 citation statement)

References 14 publications

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“…Additionally, ignition and stabilization of the plasma at the beginning of each measurement require several milliseconds, corresponding to a few nanometers of the sample surface being removed before meaningful results can be attained. However, once a suitable method for a material system is optimized, measurements are quick and reproducible [35].…”

Section: Introductionmentioning

confidence: 99%

Chemical effects during the formation of various types of femtosecond laser-generated surface structures on titanium alloy

et al. 2020

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In this contribution, chemical, structural, and mechanical alterations in various types of femtosecond laser-generated surface structures, i.e., laser-induced periodic surface structures (LIPSS, ripples), Grooves, and Spikes on titanium alloy, are characterized by various surface analytical techniques, including X-ray diffraction and glow-discharge optical emission spectroscopy. The formation of oxide layers of the different laser-based structures inherently influences the friction and wear performance as demonstrated in oil-lubricated reciprocating sliding tribological tests (RSTTs) along with subsequent elemental mapping by energy-dispersive X-ray analysis. It is revealed that the fs-laser scan processing (790 nm, 30 fs, 1 kHz) of near-wavelength-sized LIPSS leads to the formation of a graded oxide layer extending a few hundreds of nanometers into depth, consisting mainly of amorphous oxides. Other superficial fs-laser-generated structures such as periodic Grooves and irregular Spikes produced at higher fluences and effective number of pulses per unit area present even thicker graded oxide layers that are also suitable for friction reduction and wear resistance. Ultimately, these femtosecond laser-induced nanostructured surface layers efficiently prevent a direct metal-to-metal contact in the RSTT and may act as an anchor layer for specific wear-reducing additives contained in the used engine oil.

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Section: Introductionmentioning

confidence: 99%

Chemical effects during the formation of various types of femtosecond laser-generated surface structures on titanium alloy

et al. 2020

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Corrosion‐Resistant Shape‐Programmable Zn–I₂ Battery

Sonigara,

Vaghasiya,

Pumera

2024

Advanced Energy Materials

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Zinc–iodine (Zn–I2) batteries are promising, low‐cost and safe aqueous rechargeable energy storage devices. An iodide shuttle‐induced corrosion and poor zinc (Zn) stripping/plating often result in a limited battery lifetime, urges the development of multifunctional Zn anodes. To overcome these problems, here multifunctional Zn‐anode is demonstrated with shape‐programmability and uniform Zn morphology along low‐indexed (002) crystal plane, achieved by electrodepositing Zn on nitinol alloy (nickel–titanium, NiTi). It is found that the surface oxide layer on NiTi supports the uniform Zn deposition with densely packed and planar film formation that leads high corrosion resistance, while adopts the shape‐memory function. NiTi‐based device achieves extremely steady performance, benefiting from uniform and planar Zn morphology during cycling, whereas the Zn‐based device short‐circuits due to dendritic development under severe iodide corrosion. It is also demonstrated a flat‐shape‐programmed flexible pouch cell Zn–I2 battery (SP‐ZIB), which performs well in bent mode, recovers its original flat shape at elevated temperature, and shows consistent performance for validated cycles. The shape‐memory function of NiTi makes this Zn–I2 battery advanced by flexibility and shape‐programmable features. This study represents fresh insight for using smart materials as multifunctional features for the next‐generation Zn‐I2 batteries.

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Evaluation Methods for Non-contact Bend and Free Recovery Tests of Thin NiTi Wires and Their Effects on Measured Transformation Temperatures

Apell

Rettenmayr

Undisz

2020

J. of Materi Eng and Perform

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Non-contact evaluation of transformation temperatures via bend and free recovery tests requires precise optical evaluation of shape changes of NiTi components. A variety of experimental setups is documented in the literature, but the influence of the evaluation method on the transformation temperatures is rarely assessed in detail. In the present work, the reverse transformation of bent wires is evaluated comparing the tracking of the lowest wire point and the tracking of the curvature. For calculating curvatures, different approaches of fitting the wire outline were applied. Fourth degree polynomials and ellipse segment fits were found to cause high noise toward the end of the reverse transformation, second degree polynomials and circle segment fits led to increased sensitivity in that region. Accordingly, the evaluation of curvature allowed to resolve a two-stage reverse transformation, which was otherwise obscured. The reasons for this effect are discussed comparing curvatures as determined by the different evaluation methods.

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Corrosion Resistance of Nitinol Wires After Deformation

Cited by 8 publications

References 14 publications

Chemical effects during the formation of various types of femtosecond laser-generated surface structures on titanium alloy

Chemical effects during the formation of various types of femtosecond laser-generated surface structures on titanium alloy

Corrosion‐Resistant Shape‐Programmable Zn–I₂ Battery

Evaluation Methods for Non-contact Bend and Free Recovery Tests of Thin NiTi Wires and Their Effects on Measured Transformation Temperatures

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Corrosion Resistance of Nitinol Wires After Deformation

Cited by 8 publications

References 14 publications

Chemical effects during the formation of various types of femtosecond laser-generated surface structures on titanium alloy

Chemical effects during the formation of various types of femtosecond laser-generated surface structures on titanium alloy

Corrosion‐Resistant Shape‐Programmable Zn–I2 Battery

Evaluation Methods for Non-contact Bend and Free Recovery Tests of Thin NiTi Wires and Their Effects on Measured Transformation Temperatures

Contact Info

Product

Resources

About

Corrosion‐Resistant Shape‐Programmable Zn–I₂ Battery