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Shape Memory and Superelasticity

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24-09-2021 | Technical Article

Microstructural, Mechanical, and Superelastic Behavior of Thermo-Mechanically Processed Nitinol Alloy

Authors: Ashutosh Garudapalli, Akhil Bhardwaj, Kunthal Oswal, Devanshi Mathur, Amit Kumar Gupta

Published in: Shape Memory and Superelasticity | Issue 4/2021

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Abstract

NiTi has extensive use in aerospace components, orthopedic and orthodontic implants, medical instruments, civil structures, sensors, and actuators. NiTi processed by Constrained Groove Pressing (CGP) and aging treatments were investigated for its microstructural evolution, mechanical properties, and superelasticity behavior. The NiTi was subjected to one complete CGP process followed by aging treatment at 350 °C for 45 min with forced convection cooling to room temperature. Severe plastic deformation by CGP along with Ni₄Ti₃ nucleation and relaxation of localized stress by aging at 350 °C leads to microstructure refinement along with improvement in mechanical and shape memory properties. Ultimate tensile strength, yield strength, and microhardness improved by 21.70, 112.18, and 66.81%, respectively. Combined effect of CGP aging treatment resulted in high strength matrix and moderate ductility in NiTi alloy. Superelastic behavior shows a 95% increment in σ_M^ε=4% (martensite stress at 4% strain) during cyclic loadings with improved cyclic stability and superelastic response. Residual plastic strain is observed to improve by 5% during cyclic testing of CGP processed and aged NiTi. The improvements in mechanical and superelastic properties can be useful for aerospace, biomedical, and civil structure applications.

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Title: Microstructural, Mechanical, and Superelastic Behavior of Thermo-Mechanically Processed Nitinol Alloy
Authors: Ashutosh Garudapalli
Akhil Bhardwaj
Kunthal Oswal
Devanshi Mathur
Amit Kumar Gupta
Publication date: 24-09-2021
Publisher: Springer US
Published in: Shape Memory and Superelasticity / Issue 4/2021
Print ISSN: 2199-384X
Electronic ISSN: 2199-3858
DOI: https://doi.org/10.1007/s40830-021-00352-z

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Microstructural, Mechanical, and Superelastic Behavior of Thermo-Mechanically Processed Nitinol Alloy

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