Shape memory behavior of [111]-oriented NiTi single crystals after stress-assisted aging

Irfan Kaya; Hirobumi Tobe; Haluk Ersin Karaca; Emre Acar; Yuriy Chumlyakov

doi:10.1007/s40195-016-0386-1

Shape memory behavior of [111]-oriented NiTi single crystals after stress-assisted aging

Irfan Kaya, Hirobumi Tobe, Haluk Ersin Karaca, Emre Acar, Yuriy Chumlyakov

Research output: Contribution to journal › Article › peer-review

23 Scopus citations

Abstract

The shape memory behavior of [111]-oriented Ni₅₁Ti₄₉ (at.%) single crystals was investigated after stressassisted 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. Stressassisted 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%.

Original language	English
Pages (from-to)	282-286
Number of pages	5
Journal	Acta Metallurgica Sinica (English Letters)
Volume	29
Issue number	3
DOIs	https://doi.org/10.1007/s40195-016-0386-1
State	Published - Mar 2016

Bibliographical note

Publisher Copyright:
© 2016 The Chinese Society for Metals and Springer-Verlag Berlin Heidelberg.

Keywords

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

ASJC Scopus subject areas

Metals and Alloys
Industrial and Manufacturing Engineering

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10.1007/s40195-016-0386-1

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title = "Shape memory behavior of [111]-oriented NiTi single crystals after stress-assisted aging",

abstract = "The shape memory behavior of [111]-oriented Ni51Ti49 (at.%) single crystals was investigated after stressassisted 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. Stressassisted 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%.",

keywords = "Aging treatment, Phase transformations, Precipitation, Shape memory alloy (SMA), Two-way shape memory effect",

author = "Irfan Kaya and Hirobumi Tobe and Karaca, {Haluk Ersin} and Emre Acar and Yuriy Chumlyakov",

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T1 - Shape memory behavior of [111]-oriented NiTi single crystals after stress-assisted aging

AU - Kaya, Irfan

AU - Tobe, Hirobumi

AU - Karaca, Haluk Ersin

AU - Acar, Emre

AU - Chumlyakov, Yuriy

PY - 2016/3

Y1 - 2016/3

N2 - The shape memory behavior of [111]-oriented Ni51Ti49 (at.%) single crystals was investigated after stressassisted 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. Stressassisted 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%.

AB - The shape memory behavior of [111]-oriented Ni51Ti49 (at.%) single crystals was investigated after stressassisted 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. Stressassisted 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%.

KW - Aging treatment

KW - Phase transformations

KW - Precipitation

KW - Shape memory alloy (SMA)

KW - Two-way shape memory effect

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Shape memory behavior of [111]-oriented NiTi single crystals after stress-assisted aging

Abstract

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Keywords

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