TY - JOUR
T1 - Enhancing Shape Memory Response of Additively Manufactured Niti Shape Memory Alloys by Texturing and Post-Processing Heat Treatment
AU - Saghaian, Sayed E.
AU - Nematollahi, Mohammadreza
AU - Toker, Guher Pelin
AU - Moghaddam, Narges Shayesteh
AU - Saghaian, Sayed M.
AU - Radhakrishnan, Madhavan
AU - Anderoglu, Osman
AU - Elahinia, Mohammad
AU - Karaca, Haluk
N1 - Publisher Copyright:
© 2023, ASM International.
PY - 2023/3
Y1 - 2023/3
N2 - This study presents the shape memory behavior of Ni-rich NiTi shape memory alloy fabricated by Laser Powder Bed Fusion Additive Manufacturing (L-PBF-AM) before and after post-processing heat treatment. The microstructural features and thermo-mechanical responses were systematically investigated to understand the effects of processing on the behavior of the specimens. It was shown that the L-PBF-AM process improves the functionality of NiTi components by illustrating perfect superelastic behavior at higher-temperature windows compared to the casted ingot. In addition, it was revealed that shape memory responses were tailored by altering hatch distance, which significantly controls the texture formation along the building direction. After post-processing treatments, transformation temperatures were increased, hysteresis was decreased, and the strength of the samples was significantly improved. The aged L-PBF-AM sample with a smaller hatch distance (80 µm) and intense [001] texture illustrated perfect superelastic behavior with a recoverable strain of 7% and a superelastic temperature span of about 100 °C.
AB - This study presents the shape memory behavior of Ni-rich NiTi shape memory alloy fabricated by Laser Powder Bed Fusion Additive Manufacturing (L-PBF-AM) before and after post-processing heat treatment. The microstructural features and thermo-mechanical responses were systematically investigated to understand the effects of processing on the behavior of the specimens. It was shown that the L-PBF-AM process improves the functionality of NiTi components by illustrating perfect superelastic behavior at higher-temperature windows compared to the casted ingot. In addition, it was revealed that shape memory responses were tailored by altering hatch distance, which significantly controls the texture formation along the building direction. After post-processing treatments, transformation temperatures were increased, hysteresis was decreased, and the strength of the samples was significantly improved. The aged L-PBF-AM sample with a smaller hatch distance (80 µm) and intense [001] texture illustrated perfect superelastic behavior with a recoverable strain of 7% and a superelastic temperature span of about 100 °C.
KW - Additive manufacturing
KW - Heat treatment
KW - Nitinol
KW - Shape memory alloys
KW - Superelastic behavior
KW - Texture
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U2 - 10.1007/s40830-023-00425-1
DO - 10.1007/s40830-023-00425-1
M3 - Article
AN - SCOPUS:85150290780
SN - 2199-384X
VL - 9
SP - 192
EP - 206
JO - Shape Memory and Superelasticity
JF - Shape Memory and Superelasticity
IS - 1
ER -