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• W2046557969 abstract "Die Diffusion von Zn-65 in Großwinkelkorngrenzen in Al und 8 AlZn-Legierungen wurde untersucht. Bei Zn-Gehalten bis 7 At-% nimmt pK = δγDK exponentiell, danach schwächer mit der Konzentration zu. Oberhalb etwa 40 At-% Zn ist pK nahezu konzentrationsunabhängig. Der auf die Solidustemperatur bezogene Wert von DK liegt in der Größenordnung 10−5 cm2/sec. Ein einfaches Leerstellenmodell für die Diffusion in Großwinkelkorngrenzen wird diskutiert. Daraus werden für die bisher nicht untersuchte Korngrenzenselbstdiffusion in Al und Cu abgeschätzt: Die Aktivierungsenergien für die Elektromigration in dünnen, feinkörnigen Al-Schichten wie auch für die Superplastizität bei der eutektoiden Zusammensetzung sind mit den Ergebnissen dieser Arbeit kompatibel. Die Kinetik der diskontinuierlichen Ausscheidung und der eutektoiden Umwandlung in AlZn-Legierungen wird durch Grenzflächendiffusion bestimmt. The diffusion of Zn-65 in large angle grain boundaries in Al and in 8-AlZn alloys was investigated. pK = γδDK rises exponentially up to a Zn content of 7 at-%, then at a lower rate with concentration. Above 40 at-% Zn pK is almost independent of concentration. At the solidus temperature, DK is of the order of 10−5 cm2/sec. A simple vacancy model for the diffusion in large angle grain boundaries is being discussed. From the model, the following parameters for the grain boundary self diffusion in Al and Cu that have not been investigated so far can be estimated: The activation energies for the electromigration in thin polycrystalline Al films and for the superplasticity at the eutectoid composition are compatible with the results of this investigation. The kinetics of the discontinuous precipitation and the eutectoid transformation in AlZn alloys is governed by the phase boundary diffusion." @default.
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• W2046557969 date "1974-01-01" @default.
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• W2046557969 title "Untersuchung der Korngrenzendiffusion von Zn-65 in α-Aluminium-Zink-Legierungen" @default.
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• W2046557969 doi "https://doi.org/10.1002/crat.19740091206" @default.
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