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Erschienen in: Shape Memory and Superelasticity 4/2018

18.09.2018

The Effect of Low Temperature Aging and the Evolution of R-Phase in Ni-Rich NiTi

verfasst von: Ali Shamimi, Behnam Amin-Ahmadi, Aaron Stebner, Tom Duerig

Erschienen in: Shape Memory and Superelasticity | Ausgabe 4/2018

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Abstract

This study investigates the thermal and mechanical properties that arise from aging Ni-rich Ni–Ti (Nitinol) at temperatures below 250 °C, well below those commonly used to fabricate medical devices. We demonstrate that the Ni50.8–Ti49.2 composition decomposes at temperatures as low as room temperature and discuss the unusual changes in thermal and mechanical behaviors compared to common aging treatments, such as separation of Martensite and R-phase transformations. Using such aging treatments, superelasticity can be achieved without the presence of austenite at body temperature (Af > 45 °C, well above the body temperature). Furthermore, the influence of R-phase on mechanical response and the disparity between thermal and mechanical behavior is discussed in detail.

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Fußnoten
1
Recognizing that the R-phase is a martensitic transformation, the use of the capitalized term “Martensite” will refer exclusively to the B19′ martensitic phase.
 
2
This range is typical for wire or tubing measured in tension. Values depend on deformation mode and crystallographic texture.
 
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Metadaten
Titel
The Effect of Low Temperature Aging and the Evolution of R-Phase in Ni-Rich NiTi
verfasst von
Ali Shamimi
Behnam Amin-Ahmadi
Aaron Stebner
Tom Duerig
Publikationsdatum
18.09.2018
Verlag
Springer International Publishing
Erschienen in
Shape Memory and Superelasticity / Ausgabe 4/2018
Print ISSN: 2199-384X
Elektronische ISSN: 2199-3858
DOI
https://doi.org/10.1007/s40830-018-0193-9

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