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Title: High-temperature superelasticity in NiTiPt and NiTiPd shape memory alloys

Abstract

Alloying NiTi shape memory alloys with sufficient Pt and Pd at the expense of Ni has been shown to increase transformation temperatures well above those possible with the binary composition, enabling consideration of a new class of high-temperature mechanical sensors and actuators. To achieve shape memory behavior at temperatures greater than 200 °C, previous studies of NiTiPt and NiTiPd compositions have focused primarily on alloys with greater than 16 at.% Pt and 25 at.% Pd. While generally not the focus, none of these previous studies demonstrated superelastic behavior at high temperatures. In an effort to identify alloys that transform to austenite at approximately 200 °C and exhibit superelastic behavior with recoverable strains greater than 2%, a series of Ti-rich NiTiPt ternary alloys with 15.5–16.5 at.% Pt, and Ti-rich NiTiPd ternary alloys with 25–26 at.% Pd have been targeted. The polycrystalline alloys were processed via arc melting followed by homogenization heat treatment. Thermomechanical properties were measured using electro-discharge machined tension test coupons and a miniature load frame equipped with a clamshell furnace. Ultimately, superelasticity in uniaxial tension with clear plateau regions was demonstrated and characterized in these alloys at temperatures between 219 °C and 270 °C.

Authors:
ORCiD logo [1];  [1];  [1];  [2];  [1]
  1. Department of Engineering Sciences, Sandia National Laboratories, Albuquerque, NM, USA
  2. NASA Glenn Research Center, Cleveland, OH, USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1875004
Resource Type:
Published Article
Journal Name:
Journal of Intelligent Material Systems and Structures
Additional Journal Information:
Journal Name: Journal of Intelligent Material Systems and Structures Journal Volume: 34 Journal Issue: 4; Journal ID: ISSN 1045-389X
Publisher:
SAGE Publications
Country of Publication:
United States
Language:
English

Citation Formats

Massad, Jordan E., Buchheit, Thomas E., Susan, Donald F., Noebe, Ronald D., and McElhanon, James R. High-temperature superelasticity in NiTiPt and NiTiPd shape memory alloys. United States: N. p., 2022. Web. doi:10.1177/1045389X221105885.
Massad, Jordan E., Buchheit, Thomas E., Susan, Donald F., Noebe, Ronald D., & McElhanon, James R. High-temperature superelasticity in NiTiPt and NiTiPd shape memory alloys. United States. https://doi.org/10.1177/1045389X221105885
Massad, Jordan E., Buchheit, Thomas E., Susan, Donald F., Noebe, Ronald D., and McElhanon, James R. Wed . "High-temperature superelasticity in NiTiPt and NiTiPd shape memory alloys". United States. https://doi.org/10.1177/1045389X221105885.
@article{osti_1875004,
title = {High-temperature superelasticity in NiTiPt and NiTiPd shape memory alloys},
author = {Massad, Jordan E. and Buchheit, Thomas E. and Susan, Donald F. and Noebe, Ronald D. and McElhanon, James R.},
abstractNote = {Alloying NiTi shape memory alloys with sufficient Pt and Pd at the expense of Ni has been shown to increase transformation temperatures well above those possible with the binary composition, enabling consideration of a new class of high-temperature mechanical sensors and actuators. To achieve shape memory behavior at temperatures greater than 200 °C, previous studies of NiTiPt and NiTiPd compositions have focused primarily on alloys with greater than 16 at.% Pt and 25 at.% Pd. While generally not the focus, none of these previous studies demonstrated superelastic behavior at high temperatures. In an effort to identify alloys that transform to austenite at approximately 200 °C and exhibit superelastic behavior with recoverable strains greater than 2%, a series of Ti-rich NiTiPt ternary alloys with 15.5–16.5 at.% Pt, and Ti-rich NiTiPd ternary alloys with 25–26 at.% Pd have been targeted. The polycrystalline alloys were processed via arc melting followed by homogenization heat treatment. Thermomechanical properties were measured using electro-discharge machined tension test coupons and a miniature load frame equipped with a clamshell furnace. Ultimately, superelasticity in uniaxial tension with clear plateau regions was demonstrated and characterized in these alloys at temperatures between 219 °C and 270 °C.},
doi = {10.1177/1045389X221105885},
journal = {Journal of Intelligent Material Systems and Structures},
number = 4,
volume = 34,
place = {United States},
year = {Wed Jul 06 00:00:00 EDT 2022},
month = {Wed Jul 06 00:00:00 EDT 2022}
}

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