Local transformation strain measurements in precipitated NiTi single crystals

Christos Efstathiou; Huseyin Sehitoglu

doi:10.1016/j.scriptamat.2008.08.030

Local transformation strain measurements in precipitated NiTi single crystals

Christos Efstathiou, Huseyin Sehitoglu

Mechanical Science and Engineering

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

Abstract

The objective of this work was to determine the effect of composition on the local transformation strain in NiTi single crystals. Using in situ digital image correlation to obtain full-field strain measurements, we revealed that increasing Ni concentration and precipitate volume fraction results in smaller local transformation strains. Comparison of the local strain measurements to theoretical calculations indicated that detwinning strains are limited in Ni-rich compositions. It was also found that the Ni-rich compositions displayed a more homogeneous transformation.

Original language	English (US)
Pages (from-to)	1263-1266
Number of pages	4
Journal	Scripta Materialia
Volume	59
Issue number	12
DOIs	https://doi.org/10.1016/j.scriptamat.2008.08.030
State	Published - Dec 2008

Keywords

Digital image correlation
Martensitic transformation
NiTi
Shape memory alloy (SMA)

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

Online availability

10.1016/j.scriptamat.2008.08.030

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Cite this

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title = "Local transformation strain measurements in precipitated NiTi single crystals",

abstract = "The objective of this work was to determine the effect of composition on the local transformation strain in NiTi single crystals. Using in situ digital image correlation to obtain full-field strain measurements, we revealed that increasing Ni concentration and precipitate volume fraction results in smaller local transformation strains. Comparison of the local strain measurements to theoretical calculations indicated that detwinning strains are limited in Ni-rich compositions. It was also found that the Ni-rich compositions displayed a more homogeneous transformation.",

keywords = "Digital image correlation, Martensitic transformation, NiTi, Shape memory alloy (SMA)",

author = "Christos Efstathiou and Huseyin Sehitoglu",

note = "Funding Information: The work was supported by the NSF Grant No. CMS-0428428, NSF DMR 08-03270, and Mechanical Systems and US-Italy Cooperative Research Program NSF OIS O4-37345. The single crystals were obtained from Prof. Y. Chumlyakov of Tomsk State University. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.",

year = "2008",

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doi = "10.1016/j.scriptamat.2008.08.030",

language = "English (US)",

volume = "59",

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journal = "Scripta Materialia",

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T1 - Local transformation strain measurements in precipitated NiTi single crystals

AU - Efstathiou, Christos

AU - Sehitoglu, Huseyin

N1 - Funding Information: The work was supported by the NSF Grant No. CMS-0428428, NSF DMR 08-03270, and Mechanical Systems and US-Italy Cooperative Research Program NSF OIS O4-37345. The single crystals were obtained from Prof. Y. Chumlyakov of Tomsk State University. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.

PY - 2008/12

Y1 - 2008/12

N2 - The objective of this work was to determine the effect of composition on the local transformation strain in NiTi single crystals. Using in situ digital image correlation to obtain full-field strain measurements, we revealed that increasing Ni concentration and precipitate volume fraction results in smaller local transformation strains. Comparison of the local strain measurements to theoretical calculations indicated that detwinning strains are limited in Ni-rich compositions. It was also found that the Ni-rich compositions displayed a more homogeneous transformation.

AB - The objective of this work was to determine the effect of composition on the local transformation strain in NiTi single crystals. Using in situ digital image correlation to obtain full-field strain measurements, we revealed that increasing Ni concentration and precipitate volume fraction results in smaller local transformation strains. Comparison of the local strain measurements to theoretical calculations indicated that detwinning strains are limited in Ni-rich compositions. It was also found that the Ni-rich compositions displayed a more homogeneous transformation.

KW - Digital image correlation

KW - Martensitic transformation

KW - NiTi

KW - Shape memory alloy (SMA)

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JF - Scripta Materialia

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ER -

Local transformation strain measurements in precipitated NiTi single crystals

Abstract

Keywords

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