Shape Memory Effects and Work Output of [001] Ni55Fe18Ga27 Single Crystals in Torsion Mode

Sibirev, Alexey; Belyaev, Sergey; Resnina, Natalia; Николаев, В. И.; Timashov, R. B.; Averkin, A. I.

doi:10.1007/s11665-020-04776-z

Cited by 1 publication

(1 citation statement)

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“…In this context, on key aspect is functional degradation upon cyclic loading. Accordingly, when evaluating the usability of an SMA, not only the initial working performance is important, but also its performance stability and the transformation temperatures stability as well as the evolution of the strains during thermal cycling [6]. In many cases functional degradation is mainly governed by the stability of the martensitic microstructures, and the presence of phases that affect the distribution of the internal stresses in the material [7].…”

Section: Introductionmentioning

confidence: 99%

Hot forming of shape memory alloys in steel shells: formability, interface, bonding quality

Gerstein

Kahra

Golovko

et al. 2021

Prod. Eng. Res. Devel.

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Metal forming of shape memory alloys (SMA) can be challenging since these are very often brittle due to their intermetallic character. However, formability is often needed not only for realising the desired geometry but also for tailoring the microstructure and the functional properties. To investigate whether the encapsulation in a steel shell can improve the formability of shape memory alloys, Co49Ni21Ga30 and Ni49.5Fe14.5Mn4.0Ga26.0Co6.0 samples were subjected to tensile tests, upsetting, rolling and extrusion. A ferritic steel (1.0503) was used as the shell material. The shell was employed to curtail the formation of tensile stresses in the core, to maintain high temperatures during processing and to prevent oxidation. With this approach, not only forming of the SMA in the steel shell was possible but also an intensive metallurgical bond between the SMA and the steel shell can be achieved during hot rolling or extrusion.

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Section: Introductionmentioning

confidence: 99%