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Dependence of microstructure of Al-44at%Zn and Al-48at%Zn alloys on temperature

The temperature dependence of microstructure of the title alloys was studied in situ by XRD. Each alloy had been subjected to two different thermal treatments:(i)rapid quenching from the solid-solution temperature to RT and ageing at RT,(ii)cooling slowly from the solid-solution temperature to RT and ageing at RT.The microstructure of the two sets of samples depended on temperature in a different way. The observed phase transitions differed from those proposed by the phase diagram, accepted in the literature.

Al-Zn alloys; solid solution; phase transition; phase diagram; X-ray powder diffraction

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