Microstructure and shape memory behavior of [111]-oriented NiTiHfPd alloys

E. Acar; H. Tobe; H. E. Karaca; R. D. Noebe; Y. I. Chumlyakov

doi:10.1088/0964-1726/25/3/035011

Microstructure and shape memory behavior of [111]-oriented NiTiHfPd alloys

E. Acar, H. Tobe, H. E. Karaca, R. D. Noebe, Y. I. Chumlyakov

Mechanical Engineering

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

10 Scopus citations

Abstract

The relationship between the microstructure and shape memory properties of [111]-oriented Ni_45.3Ti_29.7Hf₂₀Pd₅ (at%) single crystals was explored. In this precipitation-strengthened alloy, the size and volume fraction of precipitates and interparticle distances govern the martensite morphology and the ensuing shape memory responses. Aging of the solution-treated material, leading to a microstructure of fine, closely spaced precipitates, resulted in a material capable of a shape memory strain of 2.15% at 1000 MPa in compression. Larger precipitates formed after aging the as-grown single crystals (without a prior solution treatment) resulting in a shape memory strain of 2.5% at this same stress level in constant-stress thermal cycling experiments. Superelastic strains of 4% in compression without any residual strain were possible under various microstructural conditions and the stress hysteresis could be varied between nearly 500 and 1000 MPa depending on the microstructure.

Original language	English
Article number	035011
Journal	Smart Materials and Structures
Volume	25
Issue number	3
DOIs	https://doi.org/10.1088/0964-1726/25/3/035011
State	Published - Feb 22 2016

Bibliographical note

Funding Information:
This work was supported in part by the NASA Transformative Aeronautics Concepts Program (TACP) under the Transformational Tools & Technologies Project, the NASA EPSCOR program under Grant NNX11AQ31A, KSEF-148- 502-15-355, NSF CMMI-1538665, RSF program under grant no. 14-29-00012 and Erciyes University.

Publisher Copyright:
© 2016 IOP Publishing Ltd.

Keywords

NiTiHfPd
elastic energy storage
microstructure
shape memory alloys
superelasticity

ASJC Scopus subject areas

Signal Processing
Civil and Structural Engineering
Atomic and Molecular Physics, and Optics
Materials Science (all)
Condensed Matter Physics
Mechanics of Materials
Electrical and Electronic Engineering

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title = "Microstructure and shape memory behavior of [111]-oriented NiTiHfPd alloys",

abstract = "The relationship between the microstructure and shape memory properties of [111]-oriented Ni45.3Ti29.7Hf20Pd5 (at%) single crystals was explored. In this precipitation-strengthened alloy, the size and volume fraction of precipitates and interparticle distances govern the martensite morphology and the ensuing shape memory responses. Aging of the solution-treated material, leading to a microstructure of fine, closely spaced precipitates, resulted in a material capable of a shape memory strain of 2.15% at 1000 MPa in compression. Larger precipitates formed after aging the as-grown single crystals (without a prior solution treatment) resulting in a shape memory strain of 2.5% at this same stress level in constant-stress thermal cycling experiments. Superelastic strains of 4% in compression without any residual strain were possible under various microstructural conditions and the stress hysteresis could be varied between nearly 500 and 1000 MPa depending on the microstructure.",

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author = "E. Acar and H. Tobe and Karaca, {H. E.} and Noebe, {R. D.} and Chumlyakov, {Y. I.}",

note = "Funding Information: This work was supported in part by the NASA Transformative Aeronautics Concepts Program (TACP) under the Transformational Tools & Technologies Project, the NASA EPSCOR program under Grant NNX11AQ31A, KSEF-148- 502-15-355, NSF CMMI-1538665, RSF program under grant no. 14-29-00012 and Erciyes University. Publisher Copyright: {\textcopyright} 2016 IOP Publishing Ltd.",

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AU - Karaca, H. E.

AU - Noebe, R. D.

AU - Chumlyakov, Y. I.

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N2 - The relationship between the microstructure and shape memory properties of [111]-oriented Ni45.3Ti29.7Hf20Pd5 (at%) single crystals was explored. In this precipitation-strengthened alloy, the size and volume fraction of precipitates and interparticle distances govern the martensite morphology and the ensuing shape memory responses. Aging of the solution-treated material, leading to a microstructure of fine, closely spaced precipitates, resulted in a material capable of a shape memory strain of 2.15% at 1000 MPa in compression. Larger precipitates formed after aging the as-grown single crystals (without a prior solution treatment) resulting in a shape memory strain of 2.5% at this same stress level in constant-stress thermal cycling experiments. Superelastic strains of 4% in compression without any residual strain were possible under various microstructural conditions and the stress hysteresis could be varied between nearly 500 and 1000 MPa depending on the microstructure.

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Microstructure and shape memory behavior of [111]-oriented NiTiHfPd alloys

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Keywords

ASJC Scopus subject areas

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