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

Mechanical Engineering

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

55 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

Funding Information:
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).

Publisher Copyright:
© 2016 Elsevier Ltd.

Keywords

Heat treatments
NiTiHf
Shape memory alloys
Tensile testing

ASJC Scopus subject areas

Materials Science (all)
Mechanics of Materials
Mechanical Engineering

Access to Document

10.1016/j.matdes.2016.03.163

Cite this

@article{c821af9bbf354a1ea1fd1126302685de,

title = "Tensile shape memory behavior of Ni50.3Ti29.7Hf20 high temperature shape memory alloys",

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.",

keywords = "Heat treatments, NiTiHf, Shape memory alloys, Tensile testing",

author = "Saghaian, {S. M.} and Karaca, {H. E.} and M. Souri and Turabi, {A. S.} and Noebe, {R. D.}",

note = "Funding Information: 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). Publisher Copyright: {\textcopyright} 2016 Elsevier Ltd.",

year = "2016",

month = jul,

day = "5",

doi = "10.1016/j.matdes.2016.03.163",

language = "English",

volume = "101",

pages = "340--345",

}

TY - JOUR

T1 - Tensile shape memory behavior of Ni50.3Ti29.7Hf20 high temperature shape memory alloys

AU - Saghaian, S. M.

AU - Karaca, H. E.

AU - Souri, M.

AU - Turabi, A. S.

AU - Noebe, R. D.

N1 - Funding Information: 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). Publisher Copyright: © 2016 Elsevier Ltd.

PY - 2016/7/5

Y1 - 2016/7/5

N2 - 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.

AB - 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.

KW - Heat treatments

KW - NiTiHf

KW - Shape memory alloys

KW - Tensile testing

UR - http://www.scopus.com/inward/record.url?scp=84963535751&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84963535751&partnerID=8YFLogxK

U2 - 10.1016/j.matdes.2016.03.163

DO - 10.1016/j.matdes.2016.03.163

M3 - Article

AN - SCOPUS:84963535751

VL - 101

SP - 340

EP - 345

ER -