Shape Memory Behavior of [111]-Oriented NiTi Single Crystals After Stress-Assisted Aging

doi:10.1007/s40195-016-0386-1

Abstract

Abstract:

The shape memory behavior of [111]-oriented Ni₅₁Ti₄₉ (at.%) single crystals was investigated after stress-assisted aging at 500 °C for 1.5 h under a compressive stress of -150 MPa. It was found that a single family of Ni₄Ti₃ precipitates with two crystallographically equivalent variants was formed after aging under compressive stress. Stress-assisted aging resulted in tensile two-way shape memory effect strain of 1.56% under -5 MPa. Thermal cycling under -600 MPa resulted in a transformation strain of -2.15%, while the subsequent thermal cycling under -5 MPa resulted in a tensile two-way shape memory effect strain of 2.2%.

Key words: Shape memory alloy (SMA), Two-way shape memory effect, Aging treatment, Precipitation, Phase transformations

Irfan Kaya, Hirobumi Tobe, Haluk Ersin Karaca, Emre Acar, Yuriy Chumlyakov. Shape Memory Behavior of [111]-Oriented NiTi Single Crystals After Stress-Assisted Aging[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(3): 282-286.

Figures/Tables 4

Fig. 1 a Bright field image and the corresponding SAD pattern of the Ni51Ti49 single crystal aged at 500 °C for 1.5 h under -150 MPa; b Dark field image taken using the reflection circled in the SAD pattern ina

Fig. 2 a Thermal cycling under selected constant compressive stresses, b transformation and irrecoverable strains as a function of applied stress for the [111]-oriented Ni51Ti49 single crystals aged at 500 °C for 1.5 h under -150 MPa

Fig. 3 a TWSME, b thermal cycling under -600 MPa and c TWSME after thermal cycling under -600 MPa of stress-free and stress-assisted aged [111]-oriented Ni51Ti49 single crystals

Fig. 4 Schematic illustrations of the formation of Ni4Ti3 precipitates in NiTi SMAs after aging in stress-free conditiona and under compressive stress b. Schematic illustrations for the generation of tensile TWSME due to R-phase transformation c and B19′ martensite transformation d after stress-assisted aging

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