Journal of the Japan Institute of Metals and Materials
Online ISSN : 1880-6880
Print ISSN : 0021-4876
ISSN-L : 0021-4876
The Hardening of Al-Zn Alloys Containing G.P. Zones
Shozo YoshiokaYutaka NakayamaNorio Hosokawa
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1969 Volume 33 Issue 5 Pages 566-570

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Abstract

The yield stresses of Al-Zn single crystals containing G.P. zones were measured at 77°K as functions of the solute concentration and the size of G.P. zones. It was found that the solute concentration dependence of the yield stress was in good agreement with the theory of the stacking fault strengthening mechanism, but the zone size dependence of the yield stress did not agree with any theories.
The various models proposed for zone-hardening were compared with the experimental results, and the hardening model for Al-Zn alloys should be the one in which the attractive force acts between the zones and the dislocations. In this model, there are two cases in which the shear modulus or the stacking fault energy are different between the matrix and the zones.
The difference in the shear modulus could not account for the zone size dependence of the yield stress. It is found that the stacking fault strengthening is the zone hardening mechanism in the present case, but to account for the zone size dependence of the yield stress, it should be considered that the effective stacking fault width is smaller than the value calculated by Hirsch.

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