Ultrahigh tensile transformation strains in new Ni50.5Ti36.2Hf13.3 shape memory alloy

Y. Wu; L. Patriarca; H. Sehitoglu; Y. Chumlyakov

doi:10.1016/j.scriptamat.2016.03.009

Ultrahigh tensile transformation strains in new Ni_50.5Ti_36.2Hf_13.3 shape memory alloy

Y. Wu, L. Patriarca, H. Sehitoglu, Y. Chumlyakov

Mechanical Science and Engineering

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

Abstract

We report on unprecedented transformation strains exceeding 20% in tension for Ni_50.5Ti_36.2Hf_13.3 shape memory alloy (SMA). The strain measurements were made at multiscales utilizing advanced digital image correlation. The display of excellent strain reversibility in shape memory (isothermal deformation between M_f and A_f), isobaric thermal cycling (between M_f and A_f), and superelasticity experiments (deformation above A_f) confirms a wide range of functionality. The ultrahigh strains in [111] orientation exceed the lattice deformation theory predictions possibly pointing to contributions from mechanical twinning effects. The high strength levels and large strains result in very high work outputs compared to other SMAs.

Original language	English (US)
Pages (from-to)	51-54
Number of pages	4
Journal	Scripta Materialia
Volume	118
DOIs	https://doi.org/10.1016/j.scriptamat.2016.03.009
State	Published - Jun 1 2016

Keywords

Digital image correlation
NiTiHf
Shape memory effect
Single crystals
Superelasticity

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

Online availability

10.1016/j.scriptamat.2016.03.009

Library availability

Discover UIUC Full Text

Cite this

@article{b2db2e0992fb4775bbd73f467e9debf2,

title = "Ultrahigh tensile transformation strains in new Ni50.5Ti36.2Hf13.3 shape memory alloy",

abstract = "We report on unprecedented transformation strains exceeding 20% in tension for Ni50.5Ti36.2Hf13.3 shape memory alloy (SMA). The strain measurements were made at multiscales utilizing advanced digital image correlation. The display of excellent strain reversibility in shape memory (isothermal deformation between Mf and Af), isobaric thermal cycling (between Mf and Af), and superelasticity experiments (deformation above Af) confirms a wide range of functionality. The ultrahigh strains in [111] orientation exceed the lattice deformation theory predictions possibly pointing to contributions from mechanical twinning effects. The high strength levels and large strains result in very high work outputs compared to other SMAs.",

keywords = "Digital image correlation, NiTiHf, Shape memory effect, Single crystals, Superelasticity",

author = "Y. Wu and L. Patriarca and H. Sehitoglu and Y. Chumlyakov",

note = "Funding Information: The research was supported by an NSF grant CMMI-1333884 . This support is gratefully acknowledged. The authors acknowledge Dr. Mauro Sardela, Materials Research Laboratory at Illinois, for his help with X-ray Diffraction measurements. Professor Chumlyakov was funded by RSF 14-29-00012 . Publisher Copyright: {\textcopyright} 2016 Elsevier Ltd. All rights reserved.",

year = "2016",

month = jun,

day = "1",

doi = "10.1016/j.scriptamat.2016.03.009",

language = "English (US)",

volume = "118",

pages = "51--54",

journal = "Scripta Materialia",

issn = "1359-6462",

publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Ultrahigh tensile transformation strains in new Ni50.5Ti36.2Hf13.3 shape memory alloy

AU - Wu, Y.

AU - Patriarca, L.

AU - Sehitoglu, H.

AU - Chumlyakov, Y.

N1 - Funding Information: The research was supported by an NSF grant CMMI-1333884 . This support is gratefully acknowledged. The authors acknowledge Dr. Mauro Sardela, Materials Research Laboratory at Illinois, for his help with X-ray Diffraction measurements. Professor Chumlyakov was funded by RSF 14-29-00012 . Publisher Copyright: © 2016 Elsevier Ltd. All rights reserved.

PY - 2016/6/1

Y1 - 2016/6/1

N2 - We report on unprecedented transformation strains exceeding 20% in tension for Ni50.5Ti36.2Hf13.3 shape memory alloy (SMA). The strain measurements were made at multiscales utilizing advanced digital image correlation. The display of excellent strain reversibility in shape memory (isothermal deformation between Mf and Af), isobaric thermal cycling (between Mf and Af), and superelasticity experiments (deformation above Af) confirms a wide range of functionality. The ultrahigh strains in [111] orientation exceed the lattice deformation theory predictions possibly pointing to contributions from mechanical twinning effects. The high strength levels and large strains result in very high work outputs compared to other SMAs.

AB - We report on unprecedented transformation strains exceeding 20% in tension for Ni50.5Ti36.2Hf13.3 shape memory alloy (SMA). The strain measurements were made at multiscales utilizing advanced digital image correlation. The display of excellent strain reversibility in shape memory (isothermal deformation between Mf and Af), isobaric thermal cycling (between Mf and Af), and superelasticity experiments (deformation above Af) confirms a wide range of functionality. The ultrahigh strains in [111] orientation exceed the lattice deformation theory predictions possibly pointing to contributions from mechanical twinning effects. The high strength levels and large strains result in very high work outputs compared to other SMAs.

KW - Digital image correlation

KW - NiTiHf

KW - Shape memory effect

KW - Single crystals

KW - Superelasticity

UR - http://www.scopus.com/inward/record.url?scp=84961639078&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84961639078&partnerID=8YFLogxK

U2 - 10.1016/j.scriptamat.2016.03.009

DO - 10.1016/j.scriptamat.2016.03.009

M3 - Article

AN - SCOPUS:84961639078

SN - 1359-6462

VL - 118

SP - 51

EP - 54

JO - Scripta Materialia

JF - Scripta Materialia

ER -