Abstract
Aging characteristics of an Al-6%Zn-2%Mg alloy cast into copper, iron and plaster molds were studied by means of hardness measurements, X-ray small angle scattering method and transmission electron microscopy. It was found that the initial aging rate was retarded and the age hardenability decreased in an Al-Zn-Mg cast alloy when rapidly solidified. The age hardenability in rapidly solidified Al-Zn-Mg alloy decreased as the cooling rate decreased. These results were discussed in terms of dislocations introduced during solidification and microsegregation of solute atoms.
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