[논문]X-ray diffuse scattering study of G.P. zones in Al-4 at.% Zn

Haeffner, D.R.; Cohen, J.B.

doi:10.1016/0001-6160(89)90144-2

[해외논문] X-ray diffuse scattering study of G.P. zones in Al-4 at.% Zn

Acta metallurgica, v.37 no.8, 1989년, pp.2185 - 2195

Haeffner, D.R. , Cohen, J.B.

Abstract ▼ AI-Helper

A wide-angle X-ray diffuse scattering experiment (using synchrotron radiation) has been conducted on two Al-4 at.% Zn samples, one aged 3 h and the other 168 h at 353 K. Values obtained for the Warren-Cowley short range order parameters and first order static displacements are given. The short range order parameters were used to generate a 32 x 32 x 32 unit cell model. The zones in the simulation have rough interfaces and show no faceting. The diameter for transformation from spherical to ellipsoidal zones has been found to occur at 20-25 Å. Also from the simulation, it was found that the interior of the zone is nearly all Zn. This amount of Zn is much greater than that predicted from the metastable miscibility gap. If the interface of the zone and matrix is included, the Zn concentration is found to be close to the value predicted by the lever rule. The strains for the short aging treatment decrease steadily with increased atomic distance. Those for Zn-Zn pairs are expansive along the but are compressive along the directions. The reverse is true for the Al-Zn pairs. The strains for the long aging treatment show the same trends for the first neighbor pairs, but then oscillate about zero while decreasing in amplitude with increasing distance.

Abstract

An zwei Proben der Legierung Al-4 At.-%Zn, eine drei Studen, eine 168 Stunden bei 353oC ausgelagert, wurde die diffuse Rontgenweitwinkelstreuung gemessen. Die Werte fur den Warren-Cowley-Parameter der Nahordnung und fur die statischen Verschiebungen erster Ordnung werden angegeben. Mit den Nahordnungsparametern wird ein 32 x 32 x 32-Model der Einheitszelle aufgestellt. Die Guinier-Preston-Zonen haben in der Simulation rauhe Grenzflachen und weisen keine Facettierung auf. Der Durchmesser beim Ubergang von der kugelformigen zur elliptischen Umwandlung ergab sich zu 20-25 Å. Auszerdem ergab sich aus der Simulation, dasz dasz das Innere der Zonen nahezu nur aus Zn besteht. Diese Zn-Menge ist viel groszer als diejenige, die sich aus der metastabilen Mischungslucke ergibt. Wenn die Grenzflache zwischen Guinier-Preston-Zone und Matrix berucksichtigt wird, ergibt sich eine Zn-Konzentration, die der theoretischen, nach der Hebelregel bestimmten nahezu entspricht. Die Verzerrungen nach kurzer Auslagerung sinken stetig mit zunehmendem Atomabstand. Bei den Zn-Zn-Paaren stehen diese entlang der -Richtungen im Zug, entlang der -Richtungen im Druck. Der umgekehrte Zusammenhang gilt fur die Al-Zn-Paare. Bei den lange ausgelagerten Proben findet sich dieselbe Tendenz bei den nachst-benachbarten Paaren, die Verzerrungen oszillieren dann aber mit zunehmendem Abstand in der Amplitude.

Abstract

On a realise une experience de diffusion diffuse des rayons x aux grands angles (en utilisant une radiation synchrotron) sur deux echantillons d'aluminium a 4% en atomes de zinc, l'un vieilli pendant 3 heures et l'autre 168 h a 353 K. On donne les valeurs obtenues pour les parametres d'ordre a courte distance de Warren et Cowley, et pour les deplacements statiques du premier ordre. Les parametres d'ordre a courte distance one ete utilises pour creer un modele de maille unite 32 x 32 x 32. D'apres cette simulation, les zones presentent des interfaces rugueuses et sans facettes, le diametre qui correspond a la transformation des zones spheriques en zones ellipsoidales vaut entre 20 et 25 Å, et le'interieur de la zone est presque entierement constituee de zinc. Cette quantite de zinc est bien plus importante que celle que l'on prevoit a partir du gap de miscibilite metastable. Si l'on inclut l'interface de la zone et de la matrice, la concentration en zinc est proche de la valeur predite par la regle des moments. Dans le cas du traitement de vieillissement court, les deformations decroissent regulierement lorsque la distance atomique augmente. Pour les paires Zn-Zn, il y dilatation suivant les directions , mais compression suivant les directions . Pour les paires Al-Zn, c'est l'inverse qui est vrai. Dans le cas du long traitement de vieillissement, les deformations presentent les memes tendances pour les premiers voisins, mais elles oscillent ensuite autour de zero avec une amplitude decroissante lorsque la distance augmente.

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