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Grain growth in zone-refined lead

✍ Scribed by G.F. Bolling; W.C. Winegard


Publisher
Elsevier Science
Year
1958
Weight
566 KB
Volume
6
Category
Article
ISSN
0001-6160

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✦ Synopsis


Grain growth experiments have been performed with zone-refined lead of very high purity over the range of temperatures, 16S-318Β°C.

A single growth law was observed whose departure from a simple t*'l relation could be explained on the basis of an inclusion-type hypothesis following Burke. The activation energy for grain growth was calculated to be 6.7 * 0.7 kcal/g atom. This value is lower than any which would be predicted on the basis of previous results or theory.

GROSSISSEMEST

DU GRAIN DANS DU PLOMB RAFFINE PAR LA METHODE DE LA ZONE FONDUE Des experiences de grossissement du grain ont Bti? effect&es sur du plomb de haute puretb raffini: par la mbthode de la zone fondue, dans l'intervalle da temperature: 16%318%. Une loi unique de grossissement a BtB observ&, dont la divergence d'une relation simple en t@ peut Btre expliquee sur la base d'une hypothese d'inclusions, conform&nent B Burke. L'Bnergie d'activation pour le grossissement du grain a QtB calculbe zt 6,7 & 0,7 kcal/atome. Cette valeur est inf&eure B toute autre valeur ba&e SUP des r&mltats antirieurs ou sur la thborie. KORNWACHSTUM IN ZONEN-GEREINIGTEM BLEI Das Kornwachstum von zonen-gereinigtem Blei sehr hoher Reinheit wurde im Temperaturbereich zwischen 168" und 318Β°C untersucht. Ein einheitliches Wachstumsgesetz wurde beobachtet, dessen Abweichung von der einfachen t* Beziehung auf der Grundlage einer Einschluss-Hypothese nach Burke(O) erkl(irt werden konnte. Die Aktivierungsenergie des Kornwachstums berechnet sich zu 6,7 :k 0,7 Kcal/gAtom. Dieser Wert ist kleiner els irgend ein anderer, der bisher dafiir berechnet oder gemessen wurde.


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