Cyclic Stability of Two-Way Shape Memory Effect in Aged Ni50.3Ti32.2Hf17.5 Polycrystals after Various Thermomechanical Treatments

In the present paper, the cyclic stability of the high-temperature two-way shape memory effect was studied in high-strength Ni50.3Ti32.2Hf17.5 polycrystals after various thermomechanical treatments—training (thermocycling under stress) and stress-induced martensite aging. The effect of training and...

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Bibliographic Details
Published in:Materials 2023-09, Vol.16 (18), p.6175
Main Authors: Panchenko, Elena, Tagiltsev, Anton, Timofeeva, Ekaterina, Chumlyakov, Yuriy, Marchenko, Ekaterina
Format: Article
Language:English
Subjects:
Aging
Aging (artificial)
Alloys
Deformation
Grain size
Heat treating
High temperature
Martensitic transformations
Microstructure
Point defects
Polycrystals
Shape effects
Shape memory
Stability
Strain
Temperature
Thermal cycling
Thermomechanical treatment
Training
Transformation temperature
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Summary:In the present paper, the cyclic stability of the high-temperature two-way shape memory effect was studied in high-strength Ni50.3Ti32.2Hf17.5 polycrystals after various thermomechanical treatments—training (thermocycling under stress) and stress-induced martensite aging. The effect of training and stress-induced martensite aging on the microstructure, the two-way shape memory effect, and its cyclic stability was determined. It was found out that both thermomechanical treatments induce the high-temperature two-way shape memory effect at T > 373 K, with a strain of 1.5% in tension. The influence of cyclic tests (up to 100 stress-free cycles of cooling/heating) on the two-way shape memory effect strain, the transformation temperatures, and the microstructure was established. Different degradation mechanisms of the two-way shape memory effect were established after thermocycling and stress-induced martensite aging.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma16186175