The Effect of Heat Treatment on the Shape Memory Effect and Superelasticity in NiMnGa Single Crystals

The Effect of Heat Treatment on the Shape Memory Effect and Superelasticity in NiMnGa Single Crystals

It was shown in Ni53Mn25Ga22 single crystals that the annealing at 1273 K for 1 h followed by slow cooling, at which the (L21+γ)-structure is formed, provides the increase of crystals plasticity as compared with the brittle initial L21-single crystals. The increase of critical stresses by more than...

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Veröffentlicht in:Key engineering materials 2017-07, Vol.743, p.91-94
Hauptverfasser: Tagiltsev, Anton, Chumlyakov, Yuriy, Timofeeva, Ekaterina, Pichkaleva, Maria, Panchenko, Elena
Format: Artikel
Sprache:eng
Schlagworte:
Annealing
Brittleness
Cooling
Destruction
Heat treatment
Hysteresis
L2-1 structure (crystals)
Shape memory
Single crystals
Superelasticity
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Zusammenfassung:It was shown in Ni53Mn25Ga22 single crystals that the annealing at 1273 K for 1 h followed by slow cooling, at which the (L21+γ)-structure is formed, provides the increase of crystals plasticity as compared with the brittle initial L21-single crystals. The increase of critical stresses by more than 2 times (up to σ > 150 MPa), at which the cooling/heating cycles under stress are accompanied by sample destruction, is observed. Moreover, the value of thermal hysteresis is increased by 1.5 times and the perfect curve of superelasticity is observed at T=423 K.
ISSN:1013-9826
1662-9795
1662-9795
DOI:10.4028/www.scientific.net/KEM.743.91