Effects of aging temperature and aging time on the mechanism of martensitic transformation in nickel-rich NiTi shape memory alloys

I. Kaya; H. E. Karaca; M. Nagasako; R. Kainuma

doi:10.1016/j.matchar.2019.110034

Effects of aging temperature and aging time on the mechanism of martensitic transformation in nickel-rich NiTi shape memory alloys

I. Kaya, H. E. Karaca, M. Nagasako, R. Kainuma

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

25 Citations (Scopus)

Abstract

The effects of aging temperature and time on the shape memory behavior of the high nickel-rich Ni₅₄Ti₄₆ (at.%) alloys were investigated. The changes in transformation temperatures, microstructure, lattice structure and mechanical behavior with aging were revealed. Multiple-stage phase transformation was observed for aged specimens due to the formation of Ti₃Ni₄, Ti₂Ni_3, and TiNi₃ precipitates. It was revealed that the transformation temperatures can be tailored by aging where M_s was −3 °C after 550 °C–24 h aging and 29 °C after 400 °C–3 h aging. Aged samples showed a shape memory effect with a recoverable strain of <1.6% where 550 °C–3 h aged Ni₅₄Ti₄₆ alloy showed a maximum recoverable strain of 1.55% under 500 MPa. The maximum work output was determined as 7.75 J/cm³ for 550 °C–3 h aged Ni₅₄Ti₄₆ alloys. Partial shape recovery was also observed in aged samples.

Original language	English
Article number	110034
Journal	Materials Characterization
Volume	159
DOIs	https://doi.org/10.1016/j.matchar.2019.110034
Publication status	Published - 2020 Jan

Keywords

Aging
Mechanical properties
Multi-stage phase transformation
NiTi
Shape memory alloys

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title = "Effects of aging temperature and aging time on the mechanism of martensitic transformation in nickel-rich NiTi shape memory alloys",

abstract = "The effects of aging temperature and time on the shape memory behavior of the high nickel-rich Ni54Ti46 (at.%) alloys were investigated. The changes in transformation temperatures, microstructure, lattice structure and mechanical behavior with aging were revealed. Multiple-stage phase transformation was observed for aged specimens due to the formation of Ti3Ni4, Ti2Ni3, and TiNi3 precipitates. It was revealed that the transformation temperatures can be tailored by aging where Ms was −3 °C after 550 °C–24 h aging and 29 °C after 400 °C–3 h aging. Aged samples showed a shape memory effect with a recoverable strain of <1.6% where 550 °C–3 h aged Ni54Ti46 alloy showed a maximum recoverable strain of 1.55% under 500 MPa. The maximum work output was determined as 7.75 J/cm3 for 550 °C–3 h aged Ni54Ti46 alloys. Partial shape recovery was also observed in aged samples.",

keywords = "Aging, Mechanical properties, Multi-stage phase transformation, NiTi, Shape memory alloys",

author = "I. Kaya and Karaca, {H. E.} and M. Nagasako and R. Kainuma",

note = "Funding Information: This work was supported by Eskisehir Technical University BAP (Scientific research project) Department (Project No: 1706F382 ) and the Scientific and Technological Research Council of Turkey (TUBITAK) (Project No: 2170533 ). Publisher Copyright: {\textcopyright} 2019 Elsevier Inc.",

year = "2020",

month = jan,

doi = "10.1016/j.matchar.2019.110034",

language = "English",

volume = "159",

journal = "Materials Characterization",

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T1 - Effects of aging temperature and aging time on the mechanism of martensitic transformation in nickel-rich NiTi shape memory alloys

AU - Kaya, I.

AU - Karaca, H. E.

AU - Nagasako, M.

AU - Kainuma, R.

N1 - Funding Information: This work was supported by Eskisehir Technical University BAP (Scientific research project) Department (Project No: 1706F382 ) and the Scientific and Technological Research Council of Turkey (TUBITAK) (Project No: 2170533 ). Publisher Copyright: © 2019 Elsevier Inc.

PY - 2020/1

Y1 - 2020/1

N2 - The effects of aging temperature and time on the shape memory behavior of the high nickel-rich Ni54Ti46 (at.%) alloys were investigated. The changes in transformation temperatures, microstructure, lattice structure and mechanical behavior with aging were revealed. Multiple-stage phase transformation was observed for aged specimens due to the formation of Ti3Ni4, Ti2Ni3, and TiNi3 precipitates. It was revealed that the transformation temperatures can be tailored by aging where Ms was −3 °C after 550 °C–24 h aging and 29 °C after 400 °C–3 h aging. Aged samples showed a shape memory effect with a recoverable strain of <1.6% where 550 °C–3 h aged Ni54Ti46 alloy showed a maximum recoverable strain of 1.55% under 500 MPa. The maximum work output was determined as 7.75 J/cm3 for 550 °C–3 h aged Ni54Ti46 alloys. Partial shape recovery was also observed in aged samples.

AB - The effects of aging temperature and time on the shape memory behavior of the high nickel-rich Ni54Ti46 (at.%) alloys were investigated. The changes in transformation temperatures, microstructure, lattice structure and mechanical behavior with aging were revealed. Multiple-stage phase transformation was observed for aged specimens due to the formation of Ti3Ni4, Ti2Ni3, and TiNi3 precipitates. It was revealed that the transformation temperatures can be tailored by aging where Ms was −3 °C after 550 °C–24 h aging and 29 °C after 400 °C–3 h aging. Aged samples showed a shape memory effect with a recoverable strain of <1.6% where 550 °C–3 h aged Ni54Ti46 alloy showed a maximum recoverable strain of 1.55% under 500 MPa. The maximum work output was determined as 7.75 J/cm3 for 550 °C–3 h aged Ni54Ti46 alloys. Partial shape recovery was also observed in aged samples.

KW - Aging

KW - Mechanical properties

KW - Multi-stage phase transformation

KW - NiTi

KW - Shape memory alloys

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Effects of aging temperature and aging time on the mechanism of martensitic transformation in nickel-rich NiTi shape memory alloys

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