The effects of third elements on the kinetics of order change in Ni3Al under H.V.E.M. irradiation
Identifieur interne : 000680 ( Istex/Corpus ); précédent : 000679; suivant : 000681The effects of third elements on the kinetics of order change in Ni3Al under H.V.E.M. irradiation
Auteurs : N. Njah ; A. W. KolsiSource :
- Annales de chimie - Sciences des materiaux [ 0151-9107 ] ; 1999.
Abstract
Abstract: The effects of boron, cobalt or titanium additions on the kinetics of order changes in Ni3Al under irradiation were investigated in a HVEM. The long-range order (LRO) parameter was determined by measuring the intensities of superlattice spots on the diffraction patterns. Order-variation kinetics was investigated by using a previously proposed theoretical model. The number of replacements per displacement ɛ and the steady-state LRO parameter S∞ were directly deduced by fitting a kinetic law to experimental data ; a good agreement was generally found. A weak effects of the above third elements on the disordering efficiency was observed whereas the effect of stoichiometry appeared to be more important. Reordering was found to be controlled by long-range vacancy migration with a migration enthalpy of 0.9 to 1.0 eV ; this was deduced from a comparison between the experimental temperature dependence of the steady — state LRO parameter with calculated curves. The effects of third elements on the reordering kinetics is clearly revealed : compared to binary alloys, a decrease of the effective reordering rate is generally observed.
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DOI: 10.1016/S0151-9107(99)80059-2
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Njah</name><affiliation><mods:affiliation>Laboratoire de l'Etat Solide, Faculté des Sciences, 3038 Sfax, Tunisie</mods:affiliation></affiliation></author><author><name sortKey="Kolsi, A W" sort="Kolsi, A W" uniqKey="Kolsi A" first="A. W." last="Kolsi">A. W. 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The long-range order (LRO) parameter was determined by measuring the intensities of superlattice spots on the diffraction patterns. Order-variation kinetics was investigated by using a previously proposed theoretical model. The number of replacements per displacement ɛ and the steady-state LRO parameter S∞ were directly deduced by fitting a kinetic law to experimental data ; a good agreement was generally found. A weak effects of the above third elements on the disordering efficiency was observed whereas the effect of stoichiometry appeared to be more important. Reordering was found to be controlled by long-range vacancy migration with a migration enthalpy of 0.9 to 1.0 eV ; this was deduced from a comparison between the experimental temperature dependence of the steady — state LRO parameter with calculated curves. The effects of third elements on the reordering kinetics is clearly revealed : compared to binary alloys, a decrease of the effective reordering rate is generally observed.</div></front></TEI><istex><corpusName>elsevier</corpusName><author><json:item><name>N. Njah</name><affiliations><json:string>Laboratoire de l'Etat Solide, Faculté des Sciences, 3038 Sfax, Tunisie</json:string></affiliations></json:item><json:item><name>A.W. 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The number of replacements per displacement ɛ and the steady-state LRO parameter S∞ were directly deduced by fitting a kinetic law to experimental data ; a good agreement was generally found. A weak effects of the above third elements on the disordering efficiency was observed whereas the effect of stoichiometry appeared to be more important. Reordering was found to be controlled by long-range vacancy migration with a migration enthalpy of 0.9 to 1.0 eV ; this was deduced from a comparison between the experimental temperature dependence of the steady — state LRO parameter with calculated curves. 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Njah, Laboratoire de l'Etat Solide, Faculté des Sciences, 3038 Sfax, Tunisie.</note><affiliation>Reprints: N. Njah, Laboratoire de l'Etat Solide, Faculté des Sciences, 3038 Sfax, Tunisie.</affiliation><affiliation>Laboratoire de l'Etat Solide, Faculté des Sciences, 3038 Sfax, Tunisie</affiliation></author><author xml:id="author-2"><persName><forename type="first">A.W.</forename><surname>Kolsi</surname></persName><affiliation>Laboratoire de l'Etat Solide, Faculté des Sciences, 3038 Sfax, Tunisie</affiliation></author></analytic><monogr><title level="j">Annales de chimie - Sciences des materiaux</title><title level="j" type="abbrev">ANNCSM</title><idno type="pISSN">0151-9107</idno><idno type="PII">S0151-9107(00)X0026-8</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1999"></date><biblScope unit="volume">24</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="145">145</biblScope><biblScope unit="page" to="156">156</biblScope></imprint></monogr><idno type="istex">BC1C29C0235AAEB2A7166BC919CE1EB2C47E5E97</idno><idno type="DOI">10.1016/S0151-9107(99)80059-2</idno><idno type="PII">S0151-9107(99)80059-2</idno><idno type="ArticleID">99800592</idno></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>1999</date></creation><langUsage><language ident="en">en</language></langUsage><abstract xml:lang="en"><p>Abstract: The effects of boron, cobalt or titanium additions on the kinetics of order changes in Ni3Al under irradiation were investigated in a HVEM. The long-range order (LRO) parameter was determined by measuring the intensities of superlattice spots on the diffraction patterns. Order-variation kinetics was investigated by using a previously proposed theoretical model. The number of replacements per displacement ɛ and the steady-state LRO parameter S∞ were directly deduced by fitting a kinetic law to experimental data ; a good agreement was generally found. A weak effects of the above third elements on the disordering efficiency was observed whereas the effect of stoichiometry appeared to be more important. Reordering was found to be controlled by long-range vacancy migration with a migration enthalpy of 0.9 to 1.0 eV ; this was deduced from a comparison between the experimental temperature dependence of the steady — state LRO parameter with calculated curves. The effects of third elements on the reordering kinetics is clearly revealed : compared to binary alloys, a decrease of the effective reordering rate is generally observed.</p></abstract><abstract xml:lang="fr"><p>Résumé: Effets de troisièmes éléments sur la cinétique de variation de l'ordre dans Ni3Al sous irradiation dans un microscope électronique à haute tension. Nous avons étudié les effets d'addition de bore, de cobalt ou de titane sur la cinétique de variation de l'ordre dans Ni3Al sous irradiation dans un microscope électronique à haute tension. Le paramètre d'ordre à grande distance a été déterminé par mesure de l'intensité des taches de surstructure sur les diagrammes de diffraction. La cinétique de variation de l'ordre a été étudiée en utilisant un modèle théorique proposé antérieurement. Le nombre de remplacements par déplacement e et le paramètre d'ordre stationnaire S∞ ont été obtenus en ajustant une loi cinétique aux points expérimentaux ; un accord satisfaisant est généralement obtenu. L'effet des éléments d'addition sur l'efficacité de mise en désordre est faible alors que l'effet de la stœchiométrie de l'alliage paraît être plus marqué. La remise en ordre est contrôlée par la migration à grande distance des lacunes avec des enthalpies de migration situées entre 0,9 et 1,0 eV ; ceci a été obtenue en comparant la variation expérimentale du paramètre d'ordre stationnaire avec la température aux courbes calculées. L'effet des éléments d'addition sur la cinétique de remise en ordre a été détecté : une diminution de la vitesse de remise en ordre est généralement observée.</p></abstract><textClass><keywords scheme="keyword"><list><head>article-category</head><item><term>Order change in Ni3Al under H.V.E.M. irradiation</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="1999">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><original>false</original><mimetype>text/plain</mimetype><extension>txt</extension><uri>https://api.istex.fr/document/BC1C29C0235AAEB2A7166BC919CE1EB2C47E5E97/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Elsevier doc found" wicri:toSee="Elsevier, no converted or simple article"><istex:xmlDeclaration>version="1.0" encoding="utf-8"</istex:xmlDeclaration><istex:docType PUBLIC="-//ES//DTD journal article DTD version 5.0.1//EN//XML" URI="art501.dtd" name="istex:docType"></istex:docType><istex:document><article version="5.0" xml:lang="en" docsubtype="fla"><item-info><jid>ANNCSM</jid><aid>99800592</aid><ce:pii>S0151-9107(99)80059-2</ce:pii><ce:doi>10.1016/S0151-9107(99)80059-2</ce:doi><ce:copyright type="unknown" year="1999"></ce:copyright><ce:doctopics><ce:doctopic><ce:text>Order change in Ni<ce:inf loc="post">3</ce:inf>Al under H.V.E.M. irradiation</ce:text></ce:doctopic></ce:doctopics></item-info><head><ce:title>The effects of third elements on the kinetics of order change in Ni<ce:inf loc="post">3</ce:inf>Al under H.V.E.M. irradiation</ce:title><ce:author-group><ce:author><ce:given-name>N.</ce:given-name><ce:surname>Njah</ce:surname><ce:cross-ref refid="cor1"><ce:sup>*</ce:sup></ce:cross-ref></ce:author><ce:author><ce:given-name>A.W.</ce:given-name><ce:surname>Kolsi</ce:surname></ce:author><ce:affiliation id="aff1"><ce:textfn>Laboratoire de l'Etat Solide, Faculté des Sciences, 3038 Sfax, Tunisie</ce:textfn></ce:affiliation><ce:correspondence id="cor1"><ce:label>*</ce:label><ce:text>Reprints: N. Njah, Laboratoire de l'Etat Solide, Faculté des Sciences, 3038 Sfax, Tunisie.</ce:text></ce:correspondence></ce:author-group><ce:abstract id="ab1" class="author" xml:lang="en"><ce:section-title>Abstract</ce:section-title><ce:abstract-sec><ce:simple-para>The effects of boron, cobalt or titanium additions on the kinetics of order changes in Ni<ce:inf loc="post">3</ce:inf>Al under irradiation were investigated in a HVEM. The long-range order (LRO) parameter was determined by measuring the intensities of superlattice spots on the diffraction patterns. Order-variation kinetics was investigated by using a previously proposed theoretical model. The number of replacements per displacement ɛ and the steady-state LRO parameter S<ce:sup loc="post">∞</ce:sup> were directly deduced by fitting a kinetic law to experimental data ; a good agreement was generally found. A weak effects of the above third elements on the disordering efficiency was observed whereas the effect of stoichiometry appeared to be more important. Reordering was found to be controlled by long-range vacancy migration with a migration enthalpy of 0.9 to 1.0 eV ; this was deduced from a comparison between the experimental temperature dependence of the steady — state LRO parameter with calculated curves. The effects of third elements on the reordering kinetics is clearly revealed : compared to binary alloys, a decrease of the effective reordering rate is generally observed.</ce:simple-para></ce:abstract-sec></ce:abstract><ce:abstract id="ab2" class="author" xml:lang="fr"><ce:section-title>Résumé</ce:section-title><ce:abstract-sec><ce:simple-para>Effets de troisièmes éléments sur la cinétique de variation de l'ordre dans Ni<ce:inf loc="post">3</ce:inf>Al sous irradiation dans un microscope électronique à haute tension. Nous avons étudié les effets d'addition de bore, de cobalt ou de titane sur la cinétique de variation de l'ordre dans Ni<ce:inf loc="post">3</ce:inf>Al sous irradiation dans un microscope électronique à haute tension. Le paramètre d'ordre à grande distance a été déterminé par mesure de l'intensité des taches de surstructure sur les diagrammes de diffraction. La cinétique de variation de l'ordre a été étudiée en utilisant un modèle théorique proposé antérieurement. Le nombre de remplacements par déplacement e et le paramètre d'ordre stationnaire S∞ ont été obtenus en ajustant une loi cinétique aux points expérimentaux ; un accord satisfaisant est généralement obtenu. L'effet des éléments d'addition sur l'efficacité de mise en désordre est faible alors que l'effet de la stœchiométrie de l'alliage paraît être plus marqué. La remise en ordre est contrôlée par la migration à grande distance des lacunes avec des enthalpies de migration situées entre 0,9 et 1,0 eV ; ceci a été obtenue en comparant la variation expérimentale du paramètre d'ordre stationnaire avec la température aux courbes calculées. L'effet des éléments d'addition sur la cinétique de remise en ordre a été détecté : une diminution de la vitesse de remise en ordre est généralement observée.</ce:simple-para></ce:abstract-sec></ce:abstract></head><tail><ce:bibliography><ce:section-title>References</ce:section-title><ce:bibliography-sec><ce:bib-reference id="bib1"><ce:label>[1]</ce:label><sb:reference><sb:contribution langtype="en"><sb:authors><sb:author><ce:given-name>N.</ce:given-name><ce:surname>Njah</ce:surname></sb:author></sb:authors></sb:contribution><sb:host><sb:issue><sb:series><sb:title><sb:maintitle>Ann. Chim. Sci. 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Conf. on Solid-Solid Phase Transformations in Inorganic Materials (PTM' 94)</sb:maintitle></sb:title><sb:conference>Pittsburg (USA)</sb:conference><sb:date>July 1994</sb:date></sb:edited-book></sb:host></sb:reference></ce:bib-reference></ce:bibliography-sec></ce:bibliography></tail></article></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>The effects of third elements on the kinetics of order change in Ni3Al under H.V.E.M. irradiation</title></titleInfo><titleInfo type="alternative" lang="en" contentType="CDATA"><title>The effects of third elements on the kinetics of order change in Ni</title></titleInfo><name type="personal"><namePart type="given">N.</namePart><namePart type="family">Njah</namePart><affiliation>Laboratoire de l'Etat Solide, Faculté des Sciences, 3038 Sfax, Tunisie</affiliation><description>Reprints: N. Njah, Laboratoire de l'Etat Solide, Faculté des Sciences, 3038 Sfax, Tunisie.</description><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">A.W.</namePart><namePart type="family">Kolsi</namePart><affiliation>Laboratoire de l'Etat Solide, Faculté des Sciences, 3038 Sfax, Tunisie</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article" displayLabel="Full-length article"></genre><originInfo><publisher>ELSEVIER</publisher><dateIssued encoding="w3cdtf">1999</dateIssued><copyrightDate encoding="w3cdtf">1999</copyrightDate></originInfo><language><languageTerm type="code" authority="iso639-2b">eng</languageTerm><languageTerm type="code" authority="rfc3066">en</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType></physicalDescription><abstract lang="en">Abstract: The effects of boron, cobalt or titanium additions on the kinetics of order changes in Ni3Al under irradiation were investigated in a HVEM. The long-range order (LRO) parameter was determined by measuring the intensities of superlattice spots on the diffraction patterns. Order-variation kinetics was investigated by using a previously proposed theoretical model. The number of replacements per displacement ɛ and the steady-state LRO parameter S∞ were directly deduced by fitting a kinetic law to experimental data ; a good agreement was generally found. A weak effects of the above third elements on the disordering efficiency was observed whereas the effect of stoichiometry appeared to be more important. Reordering was found to be controlled by long-range vacancy migration with a migration enthalpy of 0.9 to 1.0 eV ; this was deduced from a comparison between the experimental temperature dependence of the steady — state LRO parameter with calculated curves. The effects of third elements on the reordering kinetics is clearly revealed : compared to binary alloys, a decrease of the effective reordering rate is generally observed.</abstract><abstract lang="fr">Résumé: Effets de troisièmes éléments sur la cinétique de variation de l'ordre dans Ni3Al sous irradiation dans un microscope électronique à haute tension. Nous avons étudié les effets d'addition de bore, de cobalt ou de titane sur la cinétique de variation de l'ordre dans Ni3Al sous irradiation dans un microscope électronique à haute tension. Le paramètre d'ordre à grande distance a été déterminé par mesure de l'intensité des taches de surstructure sur les diagrammes de diffraction. La cinétique de variation de l'ordre a été étudiée en utilisant un modèle théorique proposé antérieurement. Le nombre de remplacements par déplacement e et le paramètre d'ordre stationnaire S∞ ont été obtenus en ajustant une loi cinétique aux points expérimentaux ; un accord satisfaisant est généralement obtenu. L'effet des éléments d'addition sur l'efficacité de mise en désordre est faible alors que l'effet de la stœchiométrie de l'alliage paraît être plus marqué. La remise en ordre est contrôlée par la migration à grande distance des lacunes avec des enthalpies de migration situées entre 0,9 et 1,0 eV ; ceci a été obtenue en comparant la variation expérimentale du paramètre d'ordre stationnaire avec la température aux courbes calculées. L'effet des éléments d'addition sur la cinétique de remise en ordre a été détecté : une diminution de la vitesse de remise en ordre est généralement observée.</abstract><subject><genre>article-category</genre><topic>Order change in Ni3Al under H.V.E.M. irradiation</topic></subject><relatedItem type="host"><titleInfo><title>Annales de chimie - Sciences des materiaux</title></titleInfo><titleInfo type="abbreviated"><title>ANNCSM</title></titleInfo><genre type="journal">journal</genre><originInfo><dateIssued encoding="w3cdtf">199902</dateIssued></originInfo><identifier type="ISSN">0151-9107</identifier><identifier type="PII">S0151-9107(00)X0026-8</identifier><part><date>199902</date><detail type="volume"><number>24</number><caption>vol.</caption></detail><detail type="issue"><number>2</number><caption>no.</caption></detail><extent unit="issue pages"><start>97</start><end>164</end></extent><extent unit="pages"><start>145</start><end>156</end></extent></part></relatedItem><identifier type="istex">BC1C29C0235AAEB2A7166BC919CE1EB2C47E5E97</identifier><identifier type="DOI">10.1016/S0151-9107(99)80059-2</identifier><identifier type="PII">S0151-9107(99)80059-2</identifier><identifier type="ArticleID">99800592</identifier><recordInfo><recordContentSource>ELSEVIER</recordContentSource></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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