Structure-Property Relationships of a High Strength Superelastic NiTi–1Hf Alloy

Lee Casalena; Ashley N. Bucsek; Darren C. Pagan; Garrison M. Hommer; Glen S. Bigelow; Mark Obstalecki; Ronald D. Noebe; Michael J. Mills; Aaron P. Stebner

doi:10.1002/adem.201800046

Structure-Property Relationships of a High Strength Superelastic NiTi–1Hf Alloy

Lee Casalena, Ashley N. Bucsek, Darren C. Pagan, Garrison M. Hommer, Glen S. Bigelow, Mark Obstalecki, Ronald D. Noebe, Michael J. Mills, Aaron P. Stebner

Aerospace Engineering and Mechanics

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

27 Scopus citations

Abstract

The authors report on a relatively new alloy, Ni₅₄Ti₄₅Hf₁, that exhibits strengths more than 40% greater than those of conventional NiTi-based shape memory alloys − 2.5 GPa in compression and 1.9 GPa in torsion − and retains those strengths during cycling. Furthermore, the superelastic hysteresis is very small and stable with cycling. Aging treatments are used to induce a very high density of Ni₄Ti₃ precipitates, which impede plasticity during cycling yet do not impart substantial dissipation to the reversibility of the phase transformation. Pairing compression testing with high-energy synchrotron X-ray diffraction and aberration-corrected electron microscopy provides an in-depth look at the structure-property relationships of this alloy. Specifically, it is found that a combination of small, untwinned retained martensite laths, and dislocations on the austenite-martensite interfaces primarily strengthen the alloy as opposed to dislocation networks. Furthermore, some combination of nanoprecipitation and interface dislocations is responsible for the remarkably low mechanical hysteresis exhibited by this material.

Original language	English (US)
Article number	1800046
Journal	Advanced Engineering Materials
Volume	20
Issue number	9
DOIs	https://doi.org/10.1002/adem.201800046
State	Published - Sep 2018

Bibliographical note

Funding Information:
ANB and APS acknowledge support of this work from NASA contract NNC14VB99P, which supported the crystallographic calculations. ANB also acknowledges support from NSF Fellowship DGE-1057607, which supported her efforts writing her results; APS and GMH NSF-CAREER Award #1454668 from CMMI-MoMS, which supported the X-ray and mechanical testing measurements and analyses and writing of this article. This work has benefitted from the use of CHESS, which was funded under NSF grant DMR-0936384; specifically, the X-ray measurements and time and support from M.O. and D.C.P. where made possible by the CHESS facility. Support for processing the materials for this effort came from the NASA Fundamental Aeronautics Program and the Aeronautical Sciences and Transformational Tool & Technologies Projects (technical lead Dale Hopkins). We also thank Drs. Jacob Ruff and Abbas Ebnonnasir for assistance with the synchrotron experiment. LC and MJM acknowledge support from the Mechanical Behavior and Radiation Effects Program Award No. DE-SC0001258 for the electron microscopy characterizations and writing of this article, Department of Energy, Office of Basic Sciences (Dr. John Vetrano, Program Manager). We thank Dr. Anita Garg of University of Toledo/NASA Glenn for discussions about the microstructures and early electron microscopy work on this material system.

Publisher Copyright:
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

In situ x-ray diffraction
Martensite
Precipitates
Scanning transmission electron microscopy
Shape memory alloy

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@article{4b3db60901414650aece9581f3c248ab,

title = "Structure-Property Relationships of a High Strength Superelastic NiTi–1Hf Alloy",

abstract = "The authors report on a relatively new alloy, Ni54Ti45Hf1, that exhibits strengths more than 40% greater than those of conventional NiTi-based shape memory alloys − 2.5 GPa in compression and 1.9 GPa in torsion − and retains those strengths during cycling. Furthermore, the superelastic hysteresis is very small and stable with cycling. Aging treatments are used to induce a very high density of Ni4Ti3 precipitates, which impede plasticity during cycling yet do not impart substantial dissipation to the reversibility of the phase transformation. Pairing compression testing with high-energy synchrotron X-ray diffraction and aberration-corrected electron microscopy provides an in-depth look at the structure-property relationships of this alloy. Specifically, it is found that a combination of small, untwinned retained martensite laths, and dislocations on the austenite-martensite interfaces primarily strengthen the alloy as opposed to dislocation networks. Furthermore, some combination of nanoprecipitation and interface dislocations is responsible for the remarkably low mechanical hysteresis exhibited by this material.",

keywords = "In situ x-ray diffraction, Martensite, Precipitates, Scanning transmission electron microscopy, Shape memory alloy",

author = "Lee Casalena and Bucsek, {Ashley N.} and Pagan, {Darren C.} and Hommer, {Garrison M.} and Bigelow, {Glen S.} and Mark Obstalecki and Noebe, {Ronald D.} and Mills, {Michael J.} and Stebner, {Aaron P.}",

note = "Funding Information: ANB and APS acknowledge support of this work from NASA contract NNC14VB99P, which supported the crystallographic calculations. ANB also acknowledges support from NSF Fellowship DGE-1057607, which supported her efforts writing her results; APS and GMH NSF-CAREER Award #1454668 from CMMI-MoMS, which supported the X-ray and mechanical testing measurements and analyses and writing of this article. This work has benefitted from the use of CHESS, which was funded under NSF grant DMR-0936384; specifically, the X-ray measurements and time and support from M.O. and D.C.P. where made possible by the CHESS facility. Support for processing the materials for this effort came from the NASA Fundamental Aeronautics Program and the Aeronautical Sciences and Transformational Tool & Technologies Projects (technical lead Dale Hopkins). We also thank Drs. Jacob Ruff and Abbas Ebnonnasir for assistance with the synchrotron experiment. LC and MJM acknowledge support from the Mechanical Behavior and Radiation Effects Program Award No. DE-SC0001258 for the electron microscopy characterizations and writing of this article, Department of Energy, Office of Basic Sciences (Dr. John Vetrano, Program Manager). We thank Dr. Anita Garg of University of Toledo/NASA Glenn for discussions about the microstructures and early electron microscopy work on this material system. Publisher Copyright: {\textcopyright} 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim",

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T1 - Structure-Property Relationships of a High Strength Superelastic NiTi–1Hf Alloy

AU - Casalena, Lee

AU - Bucsek, Ashley N.

AU - Pagan, Darren C.

AU - Hommer, Garrison M.

AU - Bigelow, Glen S.

AU - Obstalecki, Mark

AU - Noebe, Ronald D.

AU - Mills, Michael J.

AU - Stebner, Aaron P.

N1 - Funding Information: ANB and APS acknowledge support of this work from NASA contract NNC14VB99P, which supported the crystallographic calculations. ANB also acknowledges support from NSF Fellowship DGE-1057607, which supported her efforts writing her results; APS and GMH NSF-CAREER Award #1454668 from CMMI-MoMS, which supported the X-ray and mechanical testing measurements and analyses and writing of this article. This work has benefitted from the use of CHESS, which was funded under NSF grant DMR-0936384; specifically, the X-ray measurements and time and support from M.O. and D.C.P. where made possible by the CHESS facility. Support for processing the materials for this effort came from the NASA Fundamental Aeronautics Program and the Aeronautical Sciences and Transformational Tool & Technologies Projects (technical lead Dale Hopkins). We also thank Drs. Jacob Ruff and Abbas Ebnonnasir for assistance with the synchrotron experiment. LC and MJM acknowledge support from the Mechanical Behavior and Radiation Effects Program Award No. DE-SC0001258 for the electron microscopy characterizations and writing of this article, Department of Energy, Office of Basic Sciences (Dr. John Vetrano, Program Manager). We thank Dr. Anita Garg of University of Toledo/NASA Glenn for discussions about the microstructures and early electron microscopy work on this material system. Publisher Copyright: © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

PY - 2018/9

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N2 - The authors report on a relatively new alloy, Ni54Ti45Hf1, that exhibits strengths more than 40% greater than those of conventional NiTi-based shape memory alloys − 2.5 GPa in compression and 1.9 GPa in torsion − and retains those strengths during cycling. Furthermore, the superelastic hysteresis is very small and stable with cycling. Aging treatments are used to induce a very high density of Ni4Ti3 precipitates, which impede plasticity during cycling yet do not impart substantial dissipation to the reversibility of the phase transformation. Pairing compression testing with high-energy synchrotron X-ray diffraction and aberration-corrected electron microscopy provides an in-depth look at the structure-property relationships of this alloy. Specifically, it is found that a combination of small, untwinned retained martensite laths, and dislocations on the austenite-martensite interfaces primarily strengthen the alloy as opposed to dislocation networks. Furthermore, some combination of nanoprecipitation and interface dislocations is responsible for the remarkably low mechanical hysteresis exhibited by this material.

AB - The authors report on a relatively new alloy, Ni54Ti45Hf1, that exhibits strengths more than 40% greater than those of conventional NiTi-based shape memory alloys − 2.5 GPa in compression and 1.9 GPa in torsion − and retains those strengths during cycling. Furthermore, the superelastic hysteresis is very small and stable with cycling. Aging treatments are used to induce a very high density of Ni4Ti3 precipitates, which impede plasticity during cycling yet do not impart substantial dissipation to the reversibility of the phase transformation. Pairing compression testing with high-energy synchrotron X-ray diffraction and aberration-corrected electron microscopy provides an in-depth look at the structure-property relationships of this alloy. Specifically, it is found that a combination of small, untwinned retained martensite laths, and dislocations on the austenite-martensite interfaces primarily strengthen the alloy as opposed to dislocation networks. Furthermore, some combination of nanoprecipitation and interface dislocations is responsible for the remarkably low mechanical hysteresis exhibited by this material.

KW - In situ x-ray diffraction

KW - Martensite

KW - Precipitates

KW - Scanning transmission electron microscopy

KW - Shape memory alloy

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ER -

Structure-Property Relationships of a High Strength Superelastic NiTi–1Hf Alloy

Abstract

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