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Published in: Shape Memory and Superelasticity 1/2024

28-12-2023 | ORIGINAL RESEARCH ARTICLE

Effect of Post-treatments on the Thermomechanical Behavior of NiTiHf High-Temperature Shape Memory Alloy Fabricated with Laser Powder Bed Fusion

Authors: Timothée Cullaz, Mohammadreza Nematollahi, Keyvan Safaei, Luc Saint-Sulpice, Laurent Pino, Saeedeh Vanaei, Parastoo Jamshidi, Moataz Attallah, Othmane Benafan, Shabnam Arbab Chirani, Mohammad Elahinia

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

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Abstract

Despite increasing interest in Nickel Titanium-based high-temperature shape memory alloys (HTSMAs), machining challenges and limited functionality at elevated temperatures hinder their application in aerospace, energy, and automotive industries. Additive manufacturing, including laser powder bed fusion (LPBF) and subsequent treatments, addresses these obstacles. Employing LPBF, we processed a Ni 50.4TiHf20 HTSMA, maintaining a constant volume energy density of 64 J/mm3. Laser powers of 100 W and 200 W, with scanning speeds of 400 mm/s and 800 mm/s, respectively, were chosen for dense, defect-minimized parts. Process parameter effects on thermomechanical properties were assessed. Post-processing steps (HIP, solution treatment, aging) further enhanced properties. HIP proved more effective for 200 W samples. (Ti/Hf)-rich oxide inclusions formed during processing, impacting phase transformation temperatures. Aging treatments improved strain recovery, attributed to H-phase precipitate strengthening. After heat treatment, 100 W and 200 W samples exhibited 2.33% and 2.10% actuation strain, with negligible and near-zero residual strains.
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Metadata
Title
Effect of Post-treatments on the Thermomechanical Behavior of NiTiHf High-Temperature Shape Memory Alloy Fabricated with Laser Powder Bed Fusion
Authors
Timothée Cullaz
Mohammadreza Nematollahi
Keyvan Safaei
Luc Saint-Sulpice
Laurent Pino
Saeedeh Vanaei
Parastoo Jamshidi
Moataz Attallah
Othmane Benafan
Shabnam Arbab Chirani
Mohammad Elahinia
Publication date
28-12-2023
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/s40830-023-00472-8

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