NickelMaghrebV1, France, Analysis, bibRecord, 000106

Effect of hydrogen on the tensile strength of aged Ni-Ti superelastic alloy

Identifieur interne : 000106 ( France/Analysis ); précédent : 000105; suivant : 000107

Effect of hydrogen on the tensile strength of aged Ni-Ti superelastic alloy

Auteurs : Fehmi Gamaoun [Tunisie] ; Montassarbellah Ltaief [Tunisie] ; Tarak Bouraoui [Tunisie] ; Tarak Ben Zineb [France]

Source :

Journal of intelligent material systems and structures [ 1045-389X ] ; 2011.

RBID : Pascal:12-0043697

Descripteurs français

Pascal (Inist)
- Superélasticité, Transformation phase, Transformation martensitique, Essai traction, Alliage mémoire forme, Cavité, Courant densité, Fil métallique, Acier austénitique, Résistance traction, Rupture différée, Alliage base nickel, Résistance corrosion, Biocompatibilité, Dentisterie, Fragilisation hydrogène, Vieillissement, Température ambiante, Chlorure de sodium, Hydrogène.
Wicri :
- topic : Hydrogène.

English descriptors

KwdEn :
- Ageing, Austenitic steel, Biocompatibility, Cavity, Corrosion resistance, Delayed fracture, Density current, Dentistry, Hydrogen, Hydrogen embrittlement, Martensitic transformation, Nickel base alloys, Phase transformation, Room temperature, Shape memory alloy, Sodium chloride, Superelasticity, Tensile strength, Tension test, Wire.

Abstract

Because of its good corrosion resistance and biocompatibility, superelastic Ni-Ti wire alloys have been successfully used in orthodontic clinics. However, delayed fracture in the oral cavity has been observed. The susceptibility of a Ni-Ti shape-memory alloy toward hydrogen embrittlement has been examined with respect to the current densities and aging in air at room temperature. Orthodontic wires have been cathodically hydrogen charged using a different current density of 5, 10, and 20 A/m² from 2 to 24 h in 0.9% NaCl aqueous solution at room temperature. The critical stress for the martensite transformation under a monotonous tensile test has been 20-90 MPa higher than that without hydrogen charging. In addition, embrittlement takes place in the austenite-martensite transformation plateau. For a short period of charging, the Ni-Ti alloy conserves its superelastic behavior. However, after 24 h of aging in air at room temperature, fracture at the austenite-martensite transformation plateau takes place earlier.

Affiliations:

France, Tunisie

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Pascal:12-0043697

Le document en format XML

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<term>Corrosion resistance</term>
<term>Delayed fracture</term>
<term>Density current</term>
<term>Dentistry</term>
<term>Hydrogen</term>
<term>Hydrogen embrittlement</term>
<term>Martensitic transformation</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Superélasticité</term>
<term>Transformation phase</term>
<term>Transformation martensitique</term>
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<term>Résistance traction</term>
<term>Rupture différée</term>
<term>Alliage base nickel</term>
<term>Résistance corrosion</term>
<term>Biocompatibilité</term>
<term>Dentisterie</term>
<term>Fragilisation hydrogène</term>
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<front><div type="abstract" xml:lang="en">Because of its good corrosion resistance and biocompatibility, superelastic Ni-Ti wire alloys have been successfully used in orthodontic clinics. However, delayed fracture in the oral cavity has been observed. The susceptibility of a Ni-Ti shape-memory alloy toward hydrogen embrittlement has been examined with respect to the current densities and aging in air at room temperature. Orthodontic wires have been cathodically hydrogen charged using a different current density of 5, 10, and 20 A/m<sup>2</sup>
 from 2 to 24 h in 0.9% NaCl aqueous solution at room temperature. The critical stress for the martensite transformation under a monotonous tensile test has been 20-90 MPa higher than that without hydrogen charging. In addition, embrittlement takes place in the austenite-martensite transformation plateau. For a short period of charging, the Ni-Ti alloy conserves its superelastic behavior. However, after 24 h of aging in air at room temperature, fracture at the austenite-martensite transformation plateau takes place earlier.</div>
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Effect of hydrogen on the tensile strength of aged Ni-Ti superelastic alloy

Effect of hydrogen on the tensile strength of aged Ni-Ti superelastic alloy

Source :

Descripteurs français

English descriptors

Abstract

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