Etude des lacunes en tres faible concentration dans l'alliage fer-nickel a 70% de nickel par la methode de l'anisotropie magnetique

Chambron, W.; Caplain, Armelle

doi:10.1016/0001-6160(74)90175-8

Cited by 18 publications

(6 citation statements)

References 9 publications

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“…The predicted magnetic free energies of the Ni-vacancy binding in Fe and the Fe-vacancy binding in Ni are shown in Table V. The solute-vacancy interactions in Fe and Ni in the magnetic ground state are quite weak, being [57,58]). The solid lines denote the results obtained in the equilibrium spin-atom structures, whereas the dotted line denotes the results obtained in the chemically disordered structures in the magnetic ground states (MGS), which are collinear FM above 25% Ni and noncollinear below 25% Ni [81].…”

Section: Concentration Dependence Of Vacancy Formation Propertiesmentioning

confidence: 99%

“…We note that the calculated G mag f and E f are similar above 1000 K, which is in the range of temperatures where the measurements of E f were performed. To the best of our knowledge, the measurements of E f in fcc Fe-Ni alloys have been reported only by Caplain and Chambron using magnetic anisotropy measurements [57,58]. In their first study, measurements were performed in the disordered Fe-Ni samples with 70% Ni quenched from between 873 and 973 K, and E f was found to be 1.57 eV [57].…”

Section: Concentration Dependence Of Vacancy Formation Propertiesmentioning

confidence: 99%

“…To the best of our knowledge, the measurements of E f in fcc Fe-Ni alloys have been reported only by Caplain and Chambron using magnetic anisotropy measurements [57,58]. In their first study, measurements were performed in the disordered Fe-Ni samples with 70% Ni quenched from between 873 and 973 K, and E f was found to be 1.57 eV [57]. In their subsequent study in the disordered samples with 50% to 94% Ni quenched from above the chemical transition temperature, E f were found to be 1.80 eV regardless of the composition [58].…”

Section: Concentration Dependence Of Vacancy Formation Propertiesmentioning

confidence: 99%

“…Zhao et al [46] used density functional theory (DFT) calculations to obtain the distribution of vacancy formation energies in the ferromagnetic disordered structures with 50% and 80% Ni, and compared the DFT results with the predictions from empirical potentials. Caplain and Chambron measured vacancy formation energies in Fe-Ni disordered alloys with 50-94% Ni using the magnetic anisotropy method [57,58]. However, the effects of magnetic and chemical orders on vacancy properties remain largely unexplored experimentally and theoretically.…”

Section: Introductionmentioning

confidence: 99%

“…8. (Color online) The predicted G mag f as a function of Ni concentration at several temperatures, compared to the experimental vacancy formation energies (fcc Fe [101-104], fcc Ni [105-109], fcc Fe-Ni alloys[57,58]). The solid lines denote the results obtained in the equilibrium spin-atom structures, whereas the dotted line denotes the results obtained in the chemically disordered structures in the magnetic ground states (MGS), which are collinear FM above 25% Ni and noncollinear below 25% Ni[81].…”

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Magnetochemical effects on phase stability and vacancy formation in fcc Fe-Ni alloys

Li,

Fu,

Nastar

et al. 2022

Preprint

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We investigate phase stability and vacancy formation in fcc Fe-Ni alloys over a broad compositiontemperature range, via a density functional theory parametrized effective interaction model, which includes explicitly spin and chemical variables. On-lattice Monte Carlo simulations based on this model are used to predict the temperature evolution of the magnetochemical phase. The experimental composition-dependent Curie and chemical order-disorder transition temperatures are successfully predicted. We point out a significant effect of chemical and magnetic orders on the magnetic and chemical transitions, respectively. The resulting phase diagram shows a magnetically driven phase separation around 10-40% Ni and 570-700 K, between ferromagnetic and paramagnetic solid solutions, in agreement with experimental observations. We compute vacancy formation magnetic free energy as a function of temperature and alloy composition. We identify opposite magnetic and chemical disordering effects on vacancy formation in the alloys with 50% and 75% Ni. We find that thermal magnetic effects on vacancy formation are much larger in concentrated Fe-Ni alloys than in fcc Fe and Ni due to a stronger magnetic interaction.

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Section: Concentration Dependence Of Vacancy Formation Propertiesmentioning

confidence: 99%

Section: Concentration Dependence Of Vacancy Formation Propertiesmentioning

confidence: 99%

Section: Concentration Dependence Of Vacancy Formation Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Magnetochemical effects on phase stability and vacancy formation in fcc Fe-Ni alloys

Li,

Fu,

Nastar

et al. 2022

Preprint

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Etude de l'interaction lacune–carbone dans l'alliage Ni-20% at. Fe par la méthode de l'anisotropie magnétique induite

Caplain¹,

Chambron²

1979

Phys. Stat. Sol. (a)

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On a étudié l'élimination des lacunes retenues par trempe dans un alliage Ni‐20% at. Fe, contenant du carbone en solution solide interstitielle. L'étude a été faite en suivant l'établissement de l'ordre directionnel, par des mesures d'anisotropie magnétique. On observe un ralentissement de la migration des lacunes, qui résulte de leur piégeage sur les interstitiels de carbone; cet effet est en désaccord quantitatif avec le modèle de Lomer; il est, par contre, très bien décrit par un modèle qui tient compte de l'interaction simultanée des lacunes avec plusieurs atomes de carbone (énergie de liaison de 0,35 eV). On montre aussi que l'énergie d'interaction entre deux interstitiels de carbone est inférieure à 0,02 eV.

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Comportement en fluage à haute température de la phase γ du Cu–16,6% at Sn γ Tentative de corrélation avec la diffusion en volume

Lexcellent

Some

1989

Phys. Stat. Sol. (a)

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Pour le composé électronique Cu5Sn, d'une part des mesures de vitesse de fluage stationnaire ont été réalisées de 525 à 726 °C, sur une grande dynamique de contrainte appliquée. D'autre part, des mesures d'autodiffusion du 64Cu et du 113Sn pour la měme composition, ont été effectuées par Prinz et Wever. La confrontation des résultats permet d'affirmer que le fluage est contrǒlé par la diffusion en volume. C'est un nouveau coefficient prenant en compte l'effet de l'ordre dans l'alliage qui semble le plus adéquat. Enfin, la courbure vers le haut du diagramme d'Arrhénius obtenue pour la diffusion du cuivre (au‐dessus de 675 °C) semble confirmée par les essais de fluage.

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Etude des lacunes en tres faible concentration dans l'alliage fer-nickel a 70% de nickel par la methode de l'anisotropie magnetique

Cited by 18 publications

References 9 publications

Magnetochemical effects on phase stability and vacancy formation in fcc Fe-Ni alloys

Magnetochemical effects on phase stability and vacancy formation in fcc Fe-Ni alloys

Etude de l'interaction lacune–carbone dans l'alliage Ni-20% at. Fe par la méthode de l'anisotropie magnétique induite

Comportement en fluage à haute température de la phase γ du Cu–16,6% at Sn γ Tentative de corrélation avec la diffusion en volume

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