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Shape Memory and Superelasticity

Erschienen in:

20.05.2019 | ESOMAT 2018

In-Situ TEM Stress Induced Martensitic Transformation in Ni_50.8Ti_49.2 Microwires

verfasst von: Saeid Pourbabak, Andrey Orekhov, Vahid Samaee, Bert Verlinden, Jan Van Humbeeck, Dominique Schryvers

Erschienen in: Shape Memory and Superelasticity | Ausgabe 2/2019

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Abstract

In-situ transmission electron microscopy tensile straining is used to study the stress induced martensitic transformation in Ni_50.8Ti_49.2. Two microwire samples with different heat treatment are investigated from which one single crystal and three polycrystalline TEM specimens, the latter with micro- and nano-size grains, have been produced. The measured Young’s modulus for all TEM specimens is around 70 GPa, considerably higher than the averaged 55 GPa of the original microwire sample. The height of the superelastic stress plateau shows an inverse relationship with the specimen thickness for the polycrystalline specimens. Martensite starts nucleating within the elastic region of the stress–strain curve and on the edges of the specimens while also grain boundaries act as nucleation sites in the polycrystalline specimens. When a martensite plate reaches a grain boundary in the polycrystalline specimen, it initiates the transformation in the neighboring grain at the other side of the grain boundary. In later stages martensite plates coalesce at higher loads in the stress plateau. In highly strained specimens, residual martensite remains after release.

Vorheriger Artikel Invited Articles from ESOMAT 2018—European Symposium on Martensitic Transformations

Nächster Artikel Comparative Study of Two Multiscale Thermomechanical Models of Polycrystalline Shape Memory alloys: Application to a Representative volUme Element of Titanium–Niobium

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Titel: In-Situ TEM Stress Induced Martensitic Transformation in Ni50.8Ti49.2 Microwires
verfasst von: Saeid Pourbabak
Andrey Orekhov
Vahid Samaee
Bert Verlinden
Jan Van Humbeeck
Dominique Schryvers
Publikationsdatum: 20.05.2019
Verlag: Springer US
Erschienen in: Shape Memory and Superelasticity / Ausgabe 2/2019
Print ISSN: 2199-384X
Elektronische ISSN: 2199-3858
DOI: https://doi.org/10.1007/s40830-019-00217-6

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