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Ground state of f.c.c. alloys with multiatom interactions

✍ Scribed by John W. Cahn; Ryoichi Kikuchi


Publisher
Elsevier Science
Year
1979
Weight
766 KB
Volume
27
Category
Article
ISSN
0001-6160

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✦ Synopsis


Abmract-The ground state of a binary f.c.c. alloy with nearest neighbor interactions and tetrahedral multiatom interactions (characterized by two parameters a and j) is denved and presented in a chart which shows classification of phases in the space of u and /?. Where non-stoichiometric phases can occur, the phase boundaries at T== 0 are computed using the tetrghedron approximation of the cluster variation method. Duality of the composition and the chemical potential is emphasized and results are presented and/or interpreted in the dual approaches. RCalnCOn d&rive Mat fondamental d'une alliage binaire C.F.C. avec les interactions des premiers voisins et les interactions t&a&es et multiatomiques (caractCri&s par deux paramkres a et j?). L&at fondamental est presenti dans un diagramme montrant le classement des phases dans l&pace de a et 8. Ot les phases non-StoechiomCtriques peuvent avolr place, les limites de phase g T = 0 sent c&u&es par l'approximation t&a&ire de la mtthode de la 'cluster variation'. La dualit de la composition et ie potentiel chimique est souli&e. et les risultats sont present& et/au expliques dam Ies doubles approches. ~smsn~-Der Grundzustand einer bitt&en kfz. Legierung mit Wechselwirkung tichster Nachbarn und tetraedrischer Multiatomwechselwirkung (charakterisiert durch zwei Parameter K und fl) wird abgeleitet und in eine Darstellung, die die Phaseneinteilung im a-/I-Raum zeigt, eingetragen. Wo nichtatiichiometrische Phasen auftreten kiinnen, werden die Phasengrenzen bei T = 0 mit einer Tetraederniiherung der Cluster-Variationsmethode berechnet. Dualitit der Zusammensetzung und des chemischen Potentials wird betont und Ergebnisse werden vorgelegt und/oder in den dualen Niiherungen gedeutet.


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