Abstract
Extended aging is connected in practice with the use of softening aging by regimesT2 andT3 for semifinished products from alloys of the Al−Zn−Mg−Cu system and the loss of strength in heat-resistant alloys in operational heatings at quite high temperatures. In both cases it is necessary to predict the variation of the strength properties as a function of the heating parameters. A direct experimental study of this phenomenon requires the use of long-term heatings which is undesirable, in many cases. In this connection it became necessary to consider the possibilities of rapid prediction of the variation of the strength properties in extended aging of aluminum alloys. The present work describes a method for deriving equations that give the dependence of the temperature and time of extended aging on the strength properties of aluminum alloys on the basis of the data obtained after a comparatively short-term aging at an elevated temperature.
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