Modeling of interstitial solute behavior in a body-centered cubic metal
โ Scribed by Gary L. Steckel; Carl J. Altstetter
- Publisher
- Elsevier Science
- Year
- 1979
- Weight
- 897 KB
- Volume
- 27
- Category
- Article
- ISSN
- 0001-6160
No coin nor oath required. For personal study only.
โฆ Synopsis
Theoretical solution models from the literature are applied to the data of a recent thermodynamic study of vanadium-oxygen solid solutions. It is shown that the quasi-chemical and central atoms models can describe the behavior of interstitial oxygen in the high temperature solid solution_ The analysis shows that there are oxygen-oxygen repulsive interactions which may extend to the third nearest neighbor shell. The limitations of the models and possible discrepancies between the thermodynamic results, anelasticity studies and elasticity calculations are discussed. RCsumCNous appliquoas les mod&s theoriques de la litttrature aux rdsultats dune etude thermodyaamique r&ate des solutions solides vanadium oxygdne. Nous montroas que les mod&s quasichimiques et d'atome central peuveat d&ire le comportemeat de I'oxygtae en insertion dans la solution solide a haute temperature. Notre aaalyse montre qu il y a des interactions repulsives eotre atomes d-oxygtae jusqu'aux troisiemes voisins. Nous discutons les limitations des modtles et les differences possibles eatre la resultats thermodyaamiques, les etudes d'antlasticitt et les calculs d'tlasticitt. Zusammeafassuag-In der Literatur vorhaadeae theoretische Modelle fur Losungea wurdea auf Ergebaisse eiaer jiiagerea thermodyaamischen Uatersuchuag des Sauerstoffs in festem Vanadium aagewaadt. Es wird geteigt, dag die quasi-chemischea und Zentralatoms-Modelle das Verhalten des iaterstitiellea Sauerstoffs in Vanadium bei hoher Temperatur beschreibea koanen. Die Analyse zeigt, dag abstogende Sauerstoff-Sauerstoff-Wechselwirkuagen vorliegen, die bis zur Schale drittalchster Nachbara ausgedehnt seia kiiaaea. Die Grenzen der Modelle und mogliche Diskrepanzea zwischea thermodyaamischen Ergebaissen, aaelastischen Messungea uad Elastizitatsberechauagen werden diskutiert.
๐ SIMILAR VOLUMES
The elastic distortions near interstitial atoms in body-centered cubic crystals are estimated by an atomistic relaxation process. Through knowledge of the local strains, the elastic binding energy of a pair of interstitial atoms is calculated and is found to agree satisfactorily with Powers' experim
TEMPERATURE VARIATION OF FLOW STRESS IN BODY CENTERED CUBIC PETALS\* tier Flie~spannung direkt iiber Iti'i'C wird als I'bergang zwischen den heiden ~~~chanismen erkliirt und nicht einem Snook-Effekt zugeschriehen.
The positional entropy for interstitial solutions in hcp metals is discussed and. by the application of a regular-solution parameter, an expression for Gibbs energy is derived for two types of ordered solutions which do not destroy the hexagonal symmetry. The relative stability of the two models and
## It is shown that the available data on the diffusion coefficients of substitutional solutes B in dilute face-centered cubic solutions in A can be described approximately by the equation: &A UA -UB -GAB AP'B -APA = 4 VA -' AF'B and AF'A are the free energies of activation for solute and solvent