High temperature shape memory behavior of Ni47.3Ti29.7Hf20Pd3 alloys

Emre Acar; Guher P. Toker; Harun Kurkcu; Haluk E. Karaca

doi:10.1016/j.intermet.2019.106518

High temperature shape memory behavior of Ni_47.3Ti_29.7Hf₂₀Pd₃ alloys

Emre Acar, Guher P. Toker, Harun Kurkcu, Haluk E. Karaca

Mechanical Engineering

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

10 Scopus citations

Abstract

The shape memory properties of Ni_47.3Ti_29.7Hf₂₀Pd₃ alloys were investigated through stress-free thermal cycling, constant-stress thermal cycling and constant-temperature stress cycling experiments. The alloys showed reversible phase transformations above 180 °C, which makes them suitable for high temperature shape memory applications. Constant-stress thermal cycling experiments revealed that recoverable strains of about 2% were possible under compressive stress levels higher than 700 MPa and both the recoverable strain and thermal hysteresis values were strong functions of applied stress. Additionally, two-way shape memory strain of 0.7% was observed. Unlike most of the shape memory alloys that have Class I transformation, Class II transformation was observed in these alloys and its relationship to the elastic energy storage was discussed through thermo-elastic martensitic transformation thermodynamics approach.

Original language	English
Article number	106518
Journal	Intermetallics
Volume	111
DOIs	https://doi.org/10.1016/j.intermet.2019.106518
State	Published - Aug 2019

Bibliographical note

Funding Information:
This work was supported in part by the NSF CMMI-15-38665 , the NASA EPSCOR program under grant No: NNX11AQ31A , KY EPSCoR RID program under grant No: 3049024332 , Kuwait Foundation for the Advancement Sciences under grant No: P116-15EC-01 and Erciyes University (Grant no: FBA-2017-7604 ).

Funding Information:
This work was supported in part by the NSF CMMI-15-38665, the NASA EPSCOR program under grant No: NNX11AQ31A, KY EPSCoR RID program under grant No: 3049024332, Kuwait Foundation for the Advancement Sciences under grant No: P116-15EC-01 and Erciyes University (Grant no: FBA-2017-7604).

Publisher Copyright:
© 2019 Elsevier Ltd

Keywords

Class II transformation
High strength
High temperature shape memory alloys
NiTiHfPd
Shape memory alloys

ASJC Scopus subject areas

Chemistry (all)
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/j.intermet.2019.106518

Cite this

@article{19748845d6fb42a8af5dcc6c5c88e28b,

title = "High temperature shape memory behavior of Ni47.3Ti29.7Hf20Pd3 alloys",

abstract = "The shape memory properties of Ni47.3Ti29.7Hf20Pd3 alloys were investigated through stress-free thermal cycling, constant-stress thermal cycling and constant-temperature stress cycling experiments. The alloys showed reversible phase transformations above 180 °C, which makes them suitable for high temperature shape memory applications. Constant-stress thermal cycling experiments revealed that recoverable strains of about 2% were possible under compressive stress levels higher than 700 MPa and both the recoverable strain and thermal hysteresis values were strong functions of applied stress. Additionally, two-way shape memory strain of 0.7% was observed. Unlike most of the shape memory alloys that have Class I transformation, Class II transformation was observed in these alloys and its relationship to the elastic energy storage was discussed through thermo-elastic martensitic transformation thermodynamics approach.",

keywords = "Class II transformation, High strength, High temperature shape memory alloys, NiTiHfPd, Shape memory alloys",

author = "Emre Acar and Toker, {Guher P.} and Harun Kurkcu and Karaca, {Haluk E.}",

note = "Funding Information: This work was supported in part by the NSF CMMI-15-38665 , the NASA EPSCOR program under grant No: NNX11AQ31A , KY EPSCoR RID program under grant No: 3049024332 , Kuwait Foundation for the Advancement Sciences under grant No: P116-15EC-01 and Erciyes University (Grant no: FBA-2017-7604 ). Funding Information: This work was supported in part by the NSF CMMI-15-38665, the NASA EPSCOR program under grant No: NNX11AQ31A, KY EPSCoR RID program under grant No: 3049024332, Kuwait Foundation for the Advancement Sciences under grant No: P116-15EC-01 and Erciyes University (Grant no: FBA-2017-7604). Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd",

year = "2019",

month = aug,

doi = "10.1016/j.intermet.2019.106518",

language = "English",

volume = "111",

}

TY - JOUR

T1 - High temperature shape memory behavior of Ni47.3Ti29.7Hf20Pd3 alloys

AU - Acar, Emre

AU - Toker, Guher P.

AU - Kurkcu, Harun

AU - Karaca, Haluk E.

N1 - Funding Information: This work was supported in part by the NSF CMMI-15-38665 , the NASA EPSCOR program under grant No: NNX11AQ31A , KY EPSCoR RID program under grant No: 3049024332 , Kuwait Foundation for the Advancement Sciences under grant No: P116-15EC-01 and Erciyes University (Grant no: FBA-2017-7604 ). Funding Information: This work was supported in part by the NSF CMMI-15-38665, the NASA EPSCOR program under grant No: NNX11AQ31A, KY EPSCoR RID program under grant No: 3049024332, Kuwait Foundation for the Advancement Sciences under grant No: P116-15EC-01 and Erciyes University (Grant no: FBA-2017-7604). Publisher Copyright: © 2019 Elsevier Ltd

PY - 2019/8

Y1 - 2019/8

N2 - The shape memory properties of Ni47.3Ti29.7Hf20Pd3 alloys were investigated through stress-free thermal cycling, constant-stress thermal cycling and constant-temperature stress cycling experiments. The alloys showed reversible phase transformations above 180 °C, which makes them suitable for high temperature shape memory applications. Constant-stress thermal cycling experiments revealed that recoverable strains of about 2% were possible under compressive stress levels higher than 700 MPa and both the recoverable strain and thermal hysteresis values were strong functions of applied stress. Additionally, two-way shape memory strain of 0.7% was observed. Unlike most of the shape memory alloys that have Class I transformation, Class II transformation was observed in these alloys and its relationship to the elastic energy storage was discussed through thermo-elastic martensitic transformation thermodynamics approach.

AB - The shape memory properties of Ni47.3Ti29.7Hf20Pd3 alloys were investigated through stress-free thermal cycling, constant-stress thermal cycling and constant-temperature stress cycling experiments. The alloys showed reversible phase transformations above 180 °C, which makes them suitable for high temperature shape memory applications. Constant-stress thermal cycling experiments revealed that recoverable strains of about 2% were possible under compressive stress levels higher than 700 MPa and both the recoverable strain and thermal hysteresis values were strong functions of applied stress. Additionally, two-way shape memory strain of 0.7% was observed. Unlike most of the shape memory alloys that have Class I transformation, Class II transformation was observed in these alloys and its relationship to the elastic energy storage was discussed through thermo-elastic martensitic transformation thermodynamics approach.

KW - Class II transformation

KW - High strength

KW - High temperature shape memory alloys

KW - NiTiHfPd

KW - Shape memory alloys

UR - http://www.scopus.com/inward/record.url?scp=85066119054&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85066119054&partnerID=8YFLogxK

U2 - 10.1016/j.intermet.2019.106518

DO - 10.1016/j.intermet.2019.106518

M3 - Article

AN - SCOPUS:85066119054

VL - 111

M1 - 106518

ER -