On the stress-assisted aging in NiTiHfPd single crystal shape memory alloys

E. Acar; H. Tobe; H. E. Karaca; I. Chumlyakov

doi:10.1016/j.msea.2018.03.125

On the stress-assisted aging in NiTiHfPd single crystal shape memory alloys

E. Acar, H. Tobe, H. E. Karaca, I. Chumlyakov

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

9 Scopus citations

Abstract

The effects of aging under compressive stress of 300 MPa on the shape memory properties and microstructure of [1¯ 17]-oriented Ni_45.3Ti_29.7Hf₂₀Pd₅ single crystals were studied. It was revealed that stress-assisted aging resulted in 4 variants of the H-precipitates in contrast to 6 variants observed after stress-free aging. It was revealed that precipitate properties and martensite morphologies strongly depend on aging conditions. As a consequence of the aligned precipitates and generated internal stress, two-way shape memory effect (with up to 0.55–0.8% strain) and higher recoverable strains were observed in Ni_45.3Ti_29.7Hf₂₀Pd₅ single crystals after stress-assisted aging.

Original language	English
Pages (from-to)	51-56
Number of pages	6
Journal	Materials Science and Engineering: A
Volume	725
DOIs	https://doi.org/10.1016/j.msea.2018.03.125
State	Published - May 16 2018

Bibliographical note

Publisher Copyright:
© 2018 Elsevier B.V.

Funding

This work was supported in part by the NASA Fundamental Aeronautics Program, Aeronautical Sciences Project and the NASA EPSCOR program under grant No: NNX11AQ31A , NSF CMMI-1538665 and RFBR project with grant No: 10-03-0154-a .

Funders	Funder number
National Science Foundation (NSF)	CMMI-1538665
National Aeronautics and Space Administration	NNX11AQ31A
Japan Society for the Promotion of Science	16K18263
Russian Foundation for Basic Research	10-03-0154-a

Keywords

High strength SMAs
Martensitic transformation
NiTiHfPd
Shape memory
Stress-assisted aging

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/j.msea.2018.03.125

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title = "On the stress-assisted aging in NiTiHfPd single crystal shape memory alloys",

abstract = "The effects of aging under compressive stress of 300 MPa on the shape memory properties and microstructure of [1¯ 17]-oriented Ni45.3Ti29.7Hf20Pd5 single crystals were studied. It was revealed that stress-assisted aging resulted in 4 variants of the H-precipitates in contrast to 6 variants observed after stress-free aging. It was revealed that precipitate properties and martensite morphologies strongly depend on aging conditions. As a consequence of the aligned precipitates and generated internal stress, two-way shape memory effect (with up to 0.55–0.8% strain) and higher recoverable strains were observed in Ni45.3Ti29.7Hf20Pd5 single crystals after stress-assisted aging.",

keywords = "High strength SMAs, Martensitic transformation, NiTiHfPd, Shape memory, Stress-assisted aging",

author = "E. Acar and H. Tobe and Karaca, {H. E.} and I. Chumlyakov",

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year = "2018",

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doi = "10.1016/j.msea.2018.03.125",

language = "English",

volume = "725",

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T1 - On the stress-assisted aging in NiTiHfPd single crystal shape memory alloys

AU - Acar, E.

AU - Tobe, H.

AU - Karaca, H. E.

AU - Chumlyakov, I.

PY - 2018/5/16

Y1 - 2018/5/16

N2 - The effects of aging under compressive stress of 300 MPa on the shape memory properties and microstructure of [1¯ 17]-oriented Ni45.3Ti29.7Hf20Pd5 single crystals were studied. It was revealed that stress-assisted aging resulted in 4 variants of the H-precipitates in contrast to 6 variants observed after stress-free aging. It was revealed that precipitate properties and martensite morphologies strongly depend on aging conditions. As a consequence of the aligned precipitates and generated internal stress, two-way shape memory effect (with up to 0.55–0.8% strain) and higher recoverable strains were observed in Ni45.3Ti29.7Hf20Pd5 single crystals after stress-assisted aging.

AB - The effects of aging under compressive stress of 300 MPa on the shape memory properties and microstructure of [1¯ 17]-oriented Ni45.3Ti29.7Hf20Pd5 single crystals were studied. It was revealed that stress-assisted aging resulted in 4 variants of the H-precipitates in contrast to 6 variants observed after stress-free aging. It was revealed that precipitate properties and martensite morphologies strongly depend on aging conditions. As a consequence of the aligned precipitates and generated internal stress, two-way shape memory effect (with up to 0.55–0.8% strain) and higher recoverable strains were observed in Ni45.3Ti29.7Hf20Pd5 single crystals after stress-assisted aging.

KW - High strength SMAs

KW - Martensitic transformation

KW - NiTiHfPd

KW - Shape memory

KW - Stress-assisted aging

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SN - 0921-5093

VL - 725

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EP - 56

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

ER -

On the stress-assisted aging in NiTiHfPd single crystal shape memory alloys

Abstract

Bibliographical note

Funding

Keywords

ASJC Scopus subject areas

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