Temperature-dependent behavior of a polycrystalline NiTi shape memory alloy around the transformation regime

O. Benafan; R. D. Noebe; S. A. Padula; D. J. Gaydosh; B. A. Lerch; A. Garg; G. S. Bigelow; K. An; R. Vaidyanathan

doi:10.1016/j.scriptamat.2012.11.042

Temperature-dependent behavior of a polycrystalline NiTi shape memory alloy around the transformation regime

O. Benafan, R. D. Noebe, S. A. Padula, D. J. Gaydosh, B. A. Lerch, A. Garg, G. S. Bigelow, K. An, R. Vaidyanathan

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

57 Scopus citations

Abstract

The mechanical and microstructural behavior of a polycrystalline Ni _49.9Ti_50.1 (at.%) shape memory alloy was investigated as a function of temperature around the transformation regime. The bulk macroscopic responses, measured using ex situ tensile deformation and impulse excitation tests, were compared to the microstructural evolution captured using in situ neutron diffraction. The onset stress for inelastic deformation and dynamic Young's modulus were found to decrease with temperature in the martensite regime followed by an increase starting near the austenite start temperature, attributed to the reverse transformation.

Original language	English
Pages (from-to)	571-574
Number of pages	4
Journal	Scripta Materialia
Volume	68
Issue number	8
DOIs	https://doi.org/10.1016/j.scriptamat.2012.11.042
State	Published - Apr 2013
Externally published	Yes

Funding

Funding from the NASA Fundamental Aeronautics Program, Aeronautical Sciences and Fixed Wing Projects is gratefully acknowledged. The authors thank D.E. Nicholson and H.D. Skorpenske for technical support and helpful discussions. This work has benefited from the use of the Spallation Neutron Source at Oak Ridge National Laboratory, which is funded by the Division of Scientific User Facilities, Office of Basic Energy Sciences, US Department of Energy under Contract DE-AC05- 00OR22725 with UT-Battelle, LLC.

Funders	Funder number
U.S. Department of Energy	DE-AC05- 00OR22725
National Aeronautics and Space Administration
Basic Energy Sciences

Keywords

Dynamic modulus
Martensite reorientation
Neutron diffraction
NiTi
Shape memory alloys

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10.1016/j.scriptamat.2012.11.042

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title = "Temperature-dependent behavior of a polycrystalline NiTi shape memory alloy around the transformation regime",

abstract = "The mechanical and microstructural behavior of a polycrystalline Ni 49.9Ti50.1 (at.%) shape memory alloy was investigated as a function of temperature around the transformation regime. The bulk macroscopic responses, measured using ex situ tensile deformation and impulse excitation tests, were compared to the microstructural evolution captured using in situ neutron diffraction. The onset stress for inelastic deformation and dynamic Young's modulus were found to decrease with temperature in the martensite regime followed by an increase starting near the austenite start temperature, attributed to the reverse transformation.",

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AU - Benafan, O.

AU - Noebe, R. D.

AU - Padula, S. A.

AU - Gaydosh, D. J.

AU - Lerch, B. A.

AU - Garg, A.

AU - Bigelow, G. S.

AU - An, K.

AU - Vaidyanathan, R.

PY - 2013/4

Y1 - 2013/4

N2 - The mechanical and microstructural behavior of a polycrystalline Ni 49.9Ti50.1 (at.%) shape memory alloy was investigated as a function of temperature around the transformation regime. The bulk macroscopic responses, measured using ex situ tensile deformation and impulse excitation tests, were compared to the microstructural evolution captured using in situ neutron diffraction. The onset stress for inelastic deformation and dynamic Young's modulus were found to decrease with temperature in the martensite regime followed by an increase starting near the austenite start temperature, attributed to the reverse transformation.

AB - The mechanical and microstructural behavior of a polycrystalline Ni 49.9Ti50.1 (at.%) shape memory alloy was investigated as a function of temperature around the transformation regime. The bulk macroscopic responses, measured using ex situ tensile deformation and impulse excitation tests, were compared to the microstructural evolution captured using in situ neutron diffraction. The onset stress for inelastic deformation and dynamic Young's modulus were found to decrease with temperature in the martensite regime followed by an increase starting near the austenite start temperature, attributed to the reverse transformation.

KW - Dynamic modulus

KW - Martensite reorientation

KW - Neutron diffraction

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Temperature-dependent behavior of a polycrystalline NiTi shape memory alloy around the transformation regime

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Keywords

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