Tensile shape memory behavior of Ni50.3Ti29.7Hf20 high temperature shape memory alloys

S. M. Saghaian; H. E. Karaca; M. Souri; A. S. Turabi; R. D. Noebe

doi:10.1016/j.matdes.2016.03.163

Tensile shape memory behavior of Ni_50.3Ti_29.7Hf₂₀ high temperature shape memory alloys

S. M. Saghaian, H. E. Karaca, M. Souri, A. S. Turabi, R. D. Noebe

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

66 Scopus citations

Abstract

The effects of heat treatment on the shape memory characteristics of a polycrystalline Ni_50.3Ti_29.7Hf₂₀ alloy were studied via thermal cycling under stress and isothermal stress cycling experiments in tension. It was revealed that transformation temperatures could be increased above 100 °C with aging at temperature above 500 °C and in particular were stabilized against stress-free thermal cycling after aging at 500 °C. Recoverable strain of ~5% was observed for the as-extruded samples and decreased to ~4% after aging due to the formation of non-transformable precipitates. The aged alloys demonstrated near perfect shape memory effect under tensile stresses as high as 700 MPa and perfect superelasticity at temperatures up to 230 °C. Finally, the tension-compression asymmetry observed in NiTiHf alloys was discussed.

Original language	English
Pages (from-to)	340-345
Number of pages	6
Journal	Materials and Design
Volume	101
DOIs	https://doi.org/10.1016/j.matdes.2016.03.163
State	Published - Jul 5 2016

Bibliographical note

Publisher Copyright:
© 2016 Elsevier Ltd.

Funding

This work was supported in part by the NASA EPSCoR NNX11AQ31A , KSEF-148-502-15-355, NSF CMMI-1538665 programs and NASA Transformative Aeronautics Concepts Program (TACP), Transformational Tools & Technologies Project (Dale Hopkins, Technical Lead for Structures & Materials Discipline).

Funders	Funder number
National Science Foundation Arctic Social Science Program	CMMI-1538665
National Aeronautics and Space Administration	NNX11AQ31A, KSEF-148-502-15-355

Keywords

Heat treatments
NiTiHf
Shape memory alloys
Tensile testing

ASJC Scopus subject areas

General Materials Science
Mechanics of Materials
Mechanical Engineering

Access to Document

10.1016/j.matdes.2016.03.163

Cite this

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abstract = "The effects of heat treatment on the shape memory characteristics of a polycrystalline Ni50.3Ti29.7Hf20 alloy were studied via thermal cycling under stress and isothermal stress cycling experiments in tension. It was revealed that transformation temperatures could be increased above 100 °C with aging at temperature above 500 °C and in particular were stabilized against stress-free thermal cycling after aging at 500 °C. Recoverable strain of ~5% was observed for the as-extruded samples and decreased to ~4% after aging due to the formation of non-transformable precipitates. The aged alloys demonstrated near perfect shape memory effect under tensile stresses as high as 700 MPa and perfect superelasticity at temperatures up to 230 °C. Finally, the tension-compression asymmetry observed in NiTiHf alloys was discussed.",

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AU - Karaca, H. E.

AU - Souri, M.

AU - Turabi, A. S.

AU - Noebe, R. D.

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