NickelMaghrebV1, Main, Exploration, bibRecord, 000111

Hydrogen effect on the austenite-martensite transformation of the cycled Ni-Ti alloy

Identifieur interne : 000111 ( Main/Exploration ); précédent : 000110; suivant : 000112

Hydrogen effect on the austenite-martensite transformation of the cycled Ni-Ti alloy

Auteurs : Fehmi Gamaoun [Tunisie] ; Imen Skhiri [Tunisie] ; Tarak Bouraoui [Tunisie] ; Tarak Ben Zineb [France]

Source :

Journal of intelligent material systems and structures [ 1045-389X ] ; 2014.

RBID : Pascal:14-0194431

Descripteurs français

Pascal (Inist)
- Déformation mécanique, Hydrogène, Transformation phase, Alliage base nickel, Biocompatibilité, Nitinol, Fil métallique, Dentisterie, Alliage mémoire forme, Fragilisation hydrogène.
Wicri :
- topic : Hydrogène.

English descriptors

KwdEn :
- Biocompatibility, Dentistry, Hydrogen, Hydrogen embrittlement, Nickel base alloys, Nitinol, Phase transformations, Shape memory alloy, Strains, Wire.

Abstract

Because of its biocompatibility, superelastic Ni-Ti wire alloys have been successfully used in orthodontic clinics. The susceptibility of Ni-Ti shape memory alloys toward hydrogen embrittlement has been examined with respect to the residual stress after a few number of cycles in air at room temperature. Orthodontic wires have been cycled until having an imposed deformation of 2.1%, 4%, and 7.7% between I and 50 cycles and then have cathodically been charged by hydrogen with a current density of 10 A/m² for 4 h in a 0.9% NaCl aqueous solution at room temperature. Throughout cycling, a residual strain has been formed and has increased by the number of cycles and the value of the imposed deformation. After hydrogen charging, the critical stress enhances when the number of cycles is great and the value of the imposed deformation is high. In addition, an embrittlement occurs for the specimen submitted to 50 and 30 cycles with an imposed strain of 2.1% and 4%, respectively. Nevertheless, no embrittlement has been detected after 50 cycles until 7.7% of the imposed deformation. The results of this study imply that the embrittlement could be related to the discontinuity in the distribution of defects created by partial superelastic cycling.

Affiliations:

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Le document en format XML

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<front><div type="abstract" xml:lang="en">Because of its biocompatibility, superelastic Ni-Ti wire alloys have been successfully used in orthodontic clinics. The susceptibility of Ni-Ti shape memory alloys toward hydrogen embrittlement has been examined with respect to the residual stress after a few number of cycles in air at room temperature. Orthodontic wires have been cycled until having an imposed deformation of 2.1%, 4%, and 7.7% between I and 50 cycles and then have cathodically been charged by hydrogen with a current density of 10 A/m<sup>2</sup>
 for 4 h in a 0.9% NaCl aqueous solution at room temperature. Throughout cycling, a residual strain has been formed and has increased by the number of cycles and the value of the imposed deformation. After hydrogen charging, the critical stress enhances when the number of cycles is great and the value of the imposed deformation is high. In addition, an embrittlement occurs for the specimen submitted to 50 and 30 cycles with an imposed strain of 2.1% and 4%, respectively. Nevertheless, no embrittlement has been detected after 50 cycles until 7.7% of the imposed deformation. The results of this study imply that the embrittlement could be related to the discontinuity in the distribution of defects created by partial superelastic cycling.</div>
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Hydrogen effect on the austenite-martensite transformation of the cycled Ni-Ti alloy

Hydrogen effect on the austenite-martensite transformation of the cycled Ni-Ti alloy

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri