Modifications of the microstructure and disordering of the γ' phase in Ni-Al-Ti alloys under electron irradiation
Identifieur interne : 001092 ( Main/Merge ); précédent : 001091; suivant : 001093Modifications of the microstructure and disordering of the γ' phase in Ni-Al-Ti alloys under electron irradiation
Auteurs : N. Njah [France, Tunisie] ; D. Gilbon [France] ; O. Dimitrov [France]Source :
- Journal of Nuclear Materials [ 0022-3115 ] ; 1993.
Abstract
The microstructural evolution of two-phase γγ' Ni-Al-Ti alloys and the kinetics of disordering of the γ' phase were investigated during 1 MeV electron irradiation. At low temperatures, a high density of dislocations was nucleated during irradiation. Dark-field observations showed a progressive disappearance of the image of the γ' precipitates, due to their disordering, followed in certain cases by a reprecipitation of fine γ'-type particles. Order-disorder kinetics were studied by determining the intensities of superlattice spots on the diffraction patterns. The long-range order parameter decreased to eventually reach a steady-state value. Except at very low temperatures, this value was finite and resulted from a competition between disordering by irradiation and thermal reordering enhanced by irradiation. The experimentally observed kinetics were found to agree with previously proposed theoretical expressions. The effects of alloy composition and of the irradiation parameters on the steady-state degree of order are clearly apparent.
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DOI: 10.1016/0022-3115(93)90145-O
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Njah</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>Centre d'Etudes de Chimie Métallurgique, CNRS, 15 rue G. Urbain, F94407 Vitry-sur-Seine Cedex</wicri:regionArea><placeName><region type="region" nuts="2">Île-de-France</region><settlement type="city">Vitry-sur-Seine</settlement></placeName></affiliation><affiliation wicri:level="1"><country xml:lang="fr">Tunisie</country><wicri:regionArea>1Present address: Université de Sfax, Faculté des Sciences, Département de Chimie, 3038 Sfax</wicri:regionArea><wicri:noRegion>3038 Sfax</wicri:noRegion></affiliation></author><author><name sortKey="Gilbon, D" sort="Gilbon, D" uniqKey="Gilbon D" first="D." last="Gilbon">D. Gilbon</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>CEN-Saday/D. Tech/SRMA, F91191 Gif-sur-Yvette Cedex</wicri:regionArea><placeName><region type="region" nuts="2">Île-de-France</region><settlement type="city">Gif-sur-Yvette</settlement></placeName></affiliation></author><author><name sortKey="Dimitrov, O" sort="Dimitrov, O" uniqKey="Dimitrov O" first="O." last="Dimitrov">O. Dimitrov</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>Centre d'Etudes de Chimie Métallurgique, CNRS, 15 rue G. Urbain, F94407 Vitry-sur-Seine Cedex</wicri:regionArea><placeName><region type="region" nuts="2">Île-de-France</region><settlement type="city">Vitry-sur-Seine</settlement></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Nuclear Materials</title><title level="j" type="abbrev">NUMA</title><idno type="ISSN">0022-3115</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1993">1993</date><biblScope unit="volume">199</biblScope><biblScope unit="issue">3</biblScope><biblScope unit="page" from="237">237</biblScope><biblScope unit="page" to="246">246</biblScope></imprint><idno type="ISSN">0022-3115</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0022-3115</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The microstructural evolution of two-phase γγ' Ni-Al-Ti alloys and the kinetics of disordering of the γ' phase were investigated during 1 MeV electron irradiation. At low temperatures, a high density of dislocations was nucleated during irradiation. Dark-field observations showed a progressive disappearance of the image of the γ' precipitates, due to their disordering, followed in certain cases by a reprecipitation of fine γ'-type particles. Order-disorder kinetics were studied by determining the intensities of superlattice spots on the diffraction patterns. The long-range order parameter decreased to eventually reach a steady-state value. Except at very low temperatures, this value was finite and resulted from a competition between disordering by irradiation and thermal reordering enhanced by irradiation. The experimentally observed kinetics were found to agree with previously proposed theoretical expressions. The effects of alloy composition and of the irradiation parameters on the steady-state degree of order are clearly apparent.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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