Ageing effect and rate dependency of a NiTi shape memory alloy after hydrogen charging
Identifieur interne : 000121 ( Main/Exploration ); précédent : 000120; suivant : 000122Ageing effect and rate dependency of a NiTi shape memory alloy after hydrogen charging
Auteurs : Fehmi Gamaoun [Tunisie] ; Tarek Hassine [Tunisie]Source :
- Journal of alloys and compounds [ 0925-8388 ] ; 2014.
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Abstract
In this work, we will be interested in examining the strain rate effect on the mechanical behavior of the Ni-Ti superelastic wires immediately after hydrogen charging and after ageing. Specimens have undergone one cycle of loading-unloading, reaching a stress value of 650 MPa. During loading, strain rates from 10-5/s to 10-2/s have been achieved. Immediately after 8 h to 16 h of hydrogen charging, there has not been any embrittlement detected for the higher tensile strain rate of 10-2/s. In contrast, after 16 h of hydrogen charging and loading with the lower strain rate of 10-5/s, the Ni-Ti alloy fractures in a brittle manner during the martensite transformation stage. Moreover, after 8 h of hydrogen charging and annealing for 24 h at room temperature, the embrittlement occurs in the austenite-martensite transformation for 10-5/s and 10-4/s of the strain rate. These results show that it is difficult to study the strain rate response of the superelastic Ni-Ti wire immediately after hydrogen charging since the diffused hydrogen is more located near the subsurface. However, after ageing, where the whole specimen is affected due to the hydrogen diffusion, the embrittlement of the superelastic Ni-Ti alloy strongly depends on the strain rate. This embrittlement takes place for the low strain rate rather than the higher one.
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">Ageing effect and rate dependency of a NiTi shape memory alloy after hydrogen charging</title><author><name sortKey="Gamaoun, Fehmi" sort="Gamaoun, Fehmi" uniqKey="Gamaoun F" first="Fehmi" last="Gamaoun">Fehmi Gamaoun</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratory of Mechanics of Sousse, National Engineering School of Sousse, University of Sousse</s1><s3>TUN</s3><sZ>1 aut.</sZ></inist:fA14><country>Tunisie</country><wicri:noRegion>Laboratory of Mechanics of Sousse, National Engineering School of Sousse, University of Sousse</wicri:noRegion></affiliation></author><author><name sortKey="Hassine, Tarek" sort="Hassine, Tarek" uniqKey="Hassine T" first="Tarek" last="Hassine">Tarek Hassine</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Laboratory of Mechanical Engineering of Monastir, National Engineering School of Sousse, University of Sousse</s1><s3>TUN</s3><sZ>2 aut.</sZ></inist:fA14><country>Tunisie</country><wicri:noRegion>Laboratory of Mechanical Engineering of Monastir, National Engineering School of Sousse, University of Sousse</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">15-0030119</idno><date when="2014">2014</date><idno type="stanalyst">PASCAL 15-0030119 INIST</idno><idno type="RBID">Pascal:15-0030119</idno><idno type="wicri:Area/PascalFrancis/Corpus">000001</idno><idno type="wicri:Area/PascalFrancis/Curation">000440</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">000035</idno><idno type="wicri:explorRef" wicri:stream="PascalFrancis" wicri:step="Checkpoint">000035</idno><idno type="wicri:doubleKey">0925-8388:2014:Gamaoun F:ageing:effect:and</idno><idno type="wicri:Area/Main/Merge">000122</idno><idno type="wicri:Area/Main/Curation">000121</idno><idno type="wicri:Area/Main/Exploration">000121</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Ageing effect and rate dependency of a NiTi shape memory alloy after hydrogen charging</title><author><name sortKey="Gamaoun, Fehmi" sort="Gamaoun, Fehmi" uniqKey="Gamaoun F" first="Fehmi" last="Gamaoun">Fehmi Gamaoun</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratory of Mechanics of Sousse, National Engineering School of Sousse, University of Sousse</s1><s3>TUN</s3><sZ>1 aut.</sZ></inist:fA14><country>Tunisie</country><wicri:noRegion>Laboratory of Mechanics of Sousse, National Engineering School of Sousse, University of Sousse</wicri:noRegion></affiliation></author><author><name sortKey="Hassine, Tarek" sort="Hassine, Tarek" uniqKey="Hassine T" first="Tarek" last="Hassine">Tarek Hassine</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Laboratory of Mechanical Engineering of Monastir, National Engineering School of Sousse, University of Sousse</s1><s3>TUN</s3><sZ>2 aut.</sZ></inist:fA14><country>Tunisie</country><wicri:noRegion>Laboratory of Mechanical Engineering of Monastir, National Engineering School of Sousse, University of Sousse</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Journal of alloys and compounds</title><title level="j" type="abbreviated">J. alloys compd.</title><idno type="ISSN">0925-8388</idno><imprint><date when="2014">2014</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of alloys and compounds</title><title level="j" type="abbreviated">J. alloys compd.</title><idno type="ISSN">0925-8388</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Aging</term><term>Annealing</term><term>Cyclic loads</term><term>Hydrogen charging</term><term>Hydrogen embrittlement</term><term>Martensitic transformations</term><term>Nickel alloys</term><term>Ruptures</term><term>Shape memory alloy</term><term>Strain rate</term><term>Superelasticity</term><term>Tensile tests</term><term>Titanium alloys</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Vieillissement</term><term>Chargement hydrogène</term><term>Vitesse déformation</term><term>Superélasticité</term><term>Charge cyclique</term><term>Essai traction</term><term>Fragilisation hydrogène</term><term>Rupture</term><term>Transformation martensitique</term><term>Recuit</term><term>Nickel alliage</term><term>Titane alliage</term><term>Alliage mémoire forme</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">In this work, we will be interested in examining the strain rate effect on the mechanical behavior of the Ni-Ti superelastic wires immediately after hydrogen charging and after ageing. Specimens have undergone one cycle of loading-unloading, reaching a stress value of 650 MPa. During loading, strain rates from 10<sup>-5</sup>/s to 10<sup>-2</sup>/s have been achieved. Immediately after 8 h to 16 h of hydrogen charging, there has not been any embrittlement detected for the higher tensile strain rate of 10<sup>-2</sup>/s. In contrast, after 16 h of hydrogen charging and loading with the lower strain rate of 10<sup>-5</sup>/s, the Ni-Ti alloy fractures in a brittle manner during the martensite transformation stage. Moreover, after 8 h of hydrogen charging and annealing for 24 h at room temperature, the embrittlement occurs in the austenite-martensite transformation for 10<sup>-5</sup>/s and 10<sup>-4</sup>/s of the strain rate. These results show that it is difficult to study the strain rate response of the superelastic Ni-Ti wire immediately after hydrogen charging since the diffused hydrogen is more located near the subsurface. However, after ageing, where the whole specimen is affected due to the hydrogen diffusion, the embrittlement of the superelastic Ni-Ti alloy strongly depends on the strain rate. This embrittlement takes place for the low strain rate rather than the higher one.</div></front></TEI><affiliations><list><country><li>Tunisie</li></country></list><tree><country name="Tunisie"><noRegion><name sortKey="Gamaoun, Fehmi" sort="Gamaoun, Fehmi" uniqKey="Gamaoun F" first="Fehmi" last="Gamaoun">Fehmi Gamaoun</name></noRegion><name sortKey="Hassine, Tarek" sort="Hassine, Tarek" uniqKey="Hassine T" first="Tarek" last="Hassine">Tarek Hassine</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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