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Shape Memory and Superelasticity
Published in: Shape Memory and Superelasticity 1/2024

12-02-2024 | ORIGINAL RESEARCH ARTICLE

Ultra-High Temperature Shape Memory Behavior in Ni–Ti–Hf Alloys

Authors: O. Benafan, G. S. Bigelow, A. Garg, L. G. Wilson, R. B. Rogers, E. J. Young-Dohe, D. F. Johnson, D. A. Scheiman, J. W. Lawson, Zhigang Wu

Published in: Shape Memory and Superelasticity | Issue 1/2024

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Abstract

Shape memory behavior in stoichiometric Ni–Hf–Ti shape memory alloys with high Hf was evaluated. Five alloy compositions with a hafnium content from 30 to 50 at.% were arc melted, homogenized, and tested to reveal microstructure and shape memory properties. Transformation temperatures increased linearly with Hf addition, reaching a maximum austenite finish temperature of 1190 °C at 50Hf, measured using differential scanning calorimetry (DSC). The low temperature stable microstructures were composed of a majority B33 orthorhombic phase, with traces of B19′ monoclinic structure below the martensite finish temperature, as revealed by X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM). These microstructures convert to a B2 cubic structure at higher temperature. Macroscopically, specimens were tested isothermally at room temperature, and endured stresses as high as 1 GPa in compression. Strain recovery decreased from nearly 100% recovery in the 30Hf alloy, to nearly 0% at 50Hf alloy, as plasticity mechanisms dominated at high temperatures in the higher Hf alloys. Uniaxial constant-force thermal cycling (UCFTC) experiments revealed limited work output at high temperatures due to creep-dominant mechanisms simultaneously occurring during the phase transformation process.
previous article Effect of Post-treatments on the Thermomechanical Behavior of NiTiHf High-Temperature Shape Memory Alloy Fabricated with Laser Powder Bed Fusion
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Metadata
Title
Ultra-High Temperature Shape Memory Behavior in Ni–Ti–Hf Alloys
Authors
O. Benafan
G. S. Bigelow
A. Garg
L. G. Wilson
R. B. Rogers
E. J. Young-Dohe
D. F. Johnson
D. A. Scheiman
J. W. Lawson
Zhigang Wu
Publication date
12-02-2024
Publisher
Springer US
Published in
Shape Memory and Superelasticity / Issue 1/2024
Print ISSN: 2199-384X
Electronic ISSN: 2199-3858
DOI
https://doi.org/10.1007/s40830-024-00473-1

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